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Tytuł:
Activity of phosphofructokinase and phosphoenolopyruvate carboxylase in Norway maple (Acer platanoides L.) seeds during dormancy breaking
Autorzy:
Krawiarz, K
Szczotka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/41615.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
phosphoenolopyruvate carboxylase
dormancy breaking
glucose
activity
sucrose
phosphofructokinase
Norway maple
Acer platanoides
seed
Opis:
We analysed changes in the activity of phosphofructokinase (PFK) and phosphoenolopyruvate carboxylase (PEPC), and in the glucose and sucrose contents of Norway maple seeds stratified at 3°C (dormancy broken) or treated at temperature 15°C (dormancy not broken). We found that changes in the activity of enzymes are not linear, and 2-3 stages may be distinguished. Dormancy breaking and seed germination is associated with a high activity of PFK and PEPC, and a high glucose level in embryo axes.
Źródło:
Dendrobiology; 2002, 47
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arginine metabolism during NO- and polyamines-induced dormancy removal and germination of apple embryos
Autorzy:
Budnicka, K.
Krasuska, U.
Bogatek, R.
Gniazdowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/80327.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
apple embryo
Malus domestica
germination
dormancy
arginine
polyamine
pretreatment
nitric oxide
putrescine
spermidine
spermine
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autothecal morphs and dormancy in the camaroid graptolite Xenotheka
Autorzy:
Mierzejewski, P
Powiązania:
https://bibliotekanauki.pl/articles/23262.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Xenotheka klinostoma
Graptolithina
Camaroidea
Sweden
Ordovician
microfossil
ultrastructure
paleontology
dormancy
camaroid graptolite
Opis:
The camaroid graptolite Xenotheka klinostoma Eisenack, 1937 is described from the lower Llanvirn limestones of Gilbergabrottet, northern Öland, Sweden. Two distinct autothecal morphs are recognized: (1) normal morph (described for the first time), i.e. an autotheca with an unsculptured outer surface, devoid of both an outer lining and autothecal occlusion, and inhabited by an active zooid; and (2) sealed morph, i.e. an autotheca coated and occluded, provided with a sculptured outer lining made of a unique verrucose fabric, and inhabited by an inactive or dormant zooid. In addition, the existence of a hypothetical (3) unsealed morph or re−opened autotheca, devoid of an autothecal occlusion but provided with an outer lining, and inhabited by a reactivated zooid, is predicted. The sealed morphs may represent an adaptation which allowed their inhabitants to survive adverse conditions. The outer lining of Xenotheka is compared with a peculiar outer membrane found in the modern hemichordate Rhabdopleura, from the intertidal zone of Fiji, and with camaroid extracamaral tissue.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breaking of seed dormancy, germination and seedling emergence of the common hawthorn (Crataegus monogyna Jacq.)
Autorzy:
Bujarska-Borkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/41072.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stratification
Crataegus monogyna
common hawthorn
scarification
breaking
seedling emergence
hawthorn
germination
seed dormancy
Opis:
The most advantageous time for collecting fruits of the common hawthorn (Crataegus monogyna Jacq.) falls on October, when they are fully ripe. The stones extracted from the fruits must be dried at room temperature to the moisture content of about 10%. The dormancy of the common hawthorn seeds can be overcome by their stratification in a moist medium in one of the three thermal regimes: - 25°/3°C (16 weeks at 25°C followed by 15-18 weeks at 3°C, i.e. to the time when the first seedlings start to appear) - 20~30°/3°C (16 weeks at 20~30°C (16+8 hrs/day) followed by 15-18 weeks at 3°C, i.e. to the time when first seedlings start to appear) - 20~30°/3°C (16 weeks at 20~30°C (24+24 hrs) followed by 15-18 weeks at 3°C, i.e. to the time when first seedlings start to appear) Having been stratified, the seeds germinate vigorously (in 3-5 weeks) and at a high percentage at temperatures of 3~10°, 3~15°, 3~20° and 3~25°C, (16+8 hrs/day) and the seedlings emerge at 3~20°C (16+8 hrs/day) in 4-6 weeks. Storage for one year at -3°C in the case of the seeds dried after harvest to the moisture content of 10% does not reduce their germination capacity. Stones scarification in concentrated sulphuric acid for 120 minutes followed by stratification at 3°C has an adverse effect on seed emergence at the temperature 3~20°C (16+8 hrs/day). It is recommended that stratified seeds should be sown into the still cool soil at the end of March or the beginning of April, as the increased temperature induces the secondary dormancy in seeds.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breaking of seed dormancy in Iris suaveolens Boiss. et Reuter under in vitro conditions
Autorzy:
Hajyzadeh, M.
Yildirim, M.U.
Mokhtarzadeh, S.
Sarihan, E.O.
Khawar, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/12680343.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Iris suaveolens
ornamental plant
seed dormancy
dormancy breaking
in vitro condition
Opis:
Iris species have great economic importance for their use in ornamental and pharmaceutical industry. Flora of Turkey reports about 43 local taxons of which 16 are endemic. Iris suaveolens Boiss. et Reuter is an endemic species with high seed dormancy and has high tolerance to cold and drought. This study focused on seed dormancy break of I. suaveolens under in vitro conditions. In the first experiment, the seeds were given stratification treatment on MS medium containing different concentrations of BAP with or without NAA. The 2nd experiment reports effects of alternative combinations of cold (at 4°C, 24 h dark) – warm (16 h light photoperiod) conditions on medium containing different concentrations of plant growth regulators on agar solidified MS medium. Both experiments showed about 8.33% seed germination against 64.5% seed viability as confirmed by tetrazolium test. All germinating seeds were abnormal and very weak. In the third experiment, 10 minutes acid scarified seeds cultured at 24°C in 16 h light photo period on MS medium achieved 60.0% germination. Similar treatment under cold + dark condition was inhibitory and failed to show identical results. This underlines the importance of acid scarification, photoperiod and warm treatments of I. suaveolens seeds to break seed dormancy. All germinated seeds showed normal growth and development under field conditions.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 15-24
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka nowych odmian ziemniaka pod względem możliwości przerywania spoczynku bulw
New potato cultivars characterized in regard to dormancy breaking of tubers
Autorzy:
Wróbel, Sławomir
Robak, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2198693.pdf
Data publikacji:
2014-06-30
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
daminozyd
giberelina
spoczynek bulw
tiomocznik
ziemniak
dormancy
gibberellic acid
new cultivars
potato
thiourea
Opis:
W badaniach oceniano możliwość przerwania spoczynku bulw nowych odmian ziemniaka bezpośrednio po zbiorze na potrzeby próby oczkowej. Znajomość tej cechy odmianowej w istotny sposób usprawnia wykonywanie prób oczkowych we wczesnych terminach — tuż po zbiorach. Przebadano 23 odmiany (Bogatka, Boryna, Danuta, Etiuda, Eurostar, Gwiazda, Hermes, Honorata, Hubal, Ignacy, Igor, Innovator, Jubilat, Jurata, Jurek, Kaszub, Lavinia, Malaga, Mondeo, Oberon, Riviera, Sylvana, VR 808). Bulwy do badań pobierano z poletek zgodnie z urzędowymi terminami pobierania prób do badań weryfikacyjnych. Do przerywania spoczynku wykorzystano metodę polegającą na 15 minutowym moczeniu wycinków bulw w wodnym roztworze gibereliny, tiomocznika, Biseptolu 480 (sulfamethoxazolum, trimethoprimum) i daminozydu (B-Nine 85 SP). Większość badanych odmian miała relatywnie łatwy do przerwania spoczynek. U odmian Boryna, Hermes i Sylvana był on nieco trudniejszy pod tym względem w niektórych latach, dlatego korzystne jest przesunięcie zabiegu przynajmniej o 2–3 tygodnie po zbiorze. Do odmian, których spoczynek przerwać trudno, należą Hubal i Etiuda. Dla nich procedurę należy rozpoczynać znacznie później — nie wcześniej niż po 5 tygodniach od pobrania próby z pola. Zbyt wczesne przerywanie spoczynku tych odmian powodowało kiełkowanie jedynie około 36–64% wycinków bulw. Nie stwierdzono korelacji pomiędzy długością okresu spoczynku poszczególnych odmian a trudnością jego przerywania, jednak analizując poszczególne grupy wczesności, zaobserwowano znaczną ujemną współzależność (r = -0,66) w grupie odmian średnio wczesnych, co wskazuje, że dłuższy spoczynek u tych odmian jest relatywnie łatwiejszy do przerwania.
Presented studies evaluated the effectiveness of breaking the tuber dormancy immediately after harvest for new potato varieties, as a part of procedure of the grow-out test. Knowledge of this varietal characteristics significantly improves the performance of the grow-out test executed right after harvest. Examined varieties (23) were following: Bogatka, Boryna, Danuta, Etiuda, Eurostar, Gwiazda, Hermes, Honorata, Hubal, Ignacy, Igor, Innovator, Jubilat, Jurata, Jurek, Kaszub, Lavinia, Malaga, Mondeo, Oberon, Riviera, Sylvana, VR 808. Tuber samples were collected from the plots according to the official schedule of tuber sampling for virus indexation. To break the dormancy, eye-plugs were soaked for 15 min in aqueous solution of gibberellic acid, thiourea, Biseptol 480 (Sulfamethoxazolum, Trimethoprimum) and daminozide (B-Nine 85 SP). For most of the studied cultivars it was relatively easy to break the dormancy. In the case of cultivars Boryna, Hermes and Sylvana, breaking was slightly more difficult, therefore, it is preferable to shift the treatment to at least 2–3 weeks after harvesting. Cultivars Hubal and Etiuda required at least 5 weeks of resting for efficient dormancy breaking. For these cultivars sprouting occurred only for 36–64% eye-plugs if dormancy was broken too early. There was no correlation between the length of the resting period of each variety and difficulty of the dormancy breaking. However, when analyzed by different groups of maturity significant negative correlation was observed (r = -0.66) in the medium early cultivars indicating that a longer resting period in these varieties is relatively easier to break.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2014, 272; 93-101
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki modyfikujące kiełkowanie i wigor siewek nagoziarnistych i oplewionych odmian owsa
Factors modifying germination of seeds and vigour of seedlings in naked and hulled oat cultivars
Autorzy:
Moś, Maria
Wójtowicz, Tomasz
Zieliński, Andrzej
Simlat, Magdalena
Binek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/41492183.pdf
Data publikacji:
2008
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
owies nagoziarnisty
owies oplewiony
spoczynek
szybkość kiełkowania
temperatura
zdolność kiełkowania
dormancy
germinability
germination rate
hulled oat
naked oat
temperature
Opis:
W trzech seriach doświadczeń przeprowadzonych w latach 2004–2006 badano kiełkowanie 3 odmian nagoziarnistych (Akt, Cacko, Polar) oraz 2 oplewionych odmian owsa (Bajka i Skrzat) w temperaturach: 10, 15, 20 i 25°C. Na podstawie obserwacji kiełkowania ziarniaków prowadzonych w odstępach 24 h oznaczono zdolność kiełkowania, średni czas kiełkowania oraz dynamikę kiełkowania. Zdolność kiełkowania przyjmowała najczęściej wartości ponad 95%, a sporadycznie występujące większe wahania były rezultatem zmienności sezonowej, terminu oceny i warunków inkubacji. Wpływ zróżnicowanej temperatury inkubacji na przebieg kiełkowania obserwowano przez dłuższy okres u ziarniaków oplewionych aniżeli nagoziarnistych. Końcowe liczenie zdolności kiełkowania oraz średniego czasu kiełkowania i dynamika kiełkowania dla nagoziarnistych odmian przeprowadzone po 8 oraz po 10 dniach inkubacji ziarniaków nie wpłynęło na zróżnicowanie badanych wskaźników. Wyniki te wskazują na możliwość oceny zdolności kiełkowania ziarniaków odmian nagoziarnistych po 8 dniach. Przebieg kiełkowania ziarniaków oplewionych i nagoziarnistych inkubowanych bezpośrednio po zbiorze w temperaturze 25°C wskazywał na głębszy stan spoczynkowy ziarniaków oplewionych w porównaniu do nagoziarnistych.
In three series of experiments conducted in the years 2004–2006 germination of seeds of three naked oat cultivars (Akt, Cacko and Polar) and two hulled oat cultivars (Bajka and Skrzat) was investigated at the following temperatures: 10, 15, 20 and 25°C. On the basis of observations collected at intervals of 24 hours germinabilty of the seeds, mean germination time and dynamics of germination were estimated. In most cases the germinability of seeds exceeded 95%, sporadic fluctuations in value of this index were caused by seasonal variability, evaluation date and conditions during seeds incubation. The effect of various temperatures during seeds incubation on germination process was more long-lasting in the hulled oat cultivars as compared to the naked ones. The results of final evaluation of germinability of seeds, mean germination time and dynamics of germination carried out on the 8th day as well as on the 10th day of seeds incubation were similar. This fact points to a possibility of evaluation of germinability in naked oat cultivars in 8-days period. The process of germination of naked and hulled oat cultivars’ seeds, which were incubated at 25°C directly after harvest showed deeper dormancy of the hulled cultivars’ seeds as compared to the naked ones.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2008, 249; 167-176
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dormancy breaking and seed germination of the annual weeds Thlaspi arvense, Descurainia sophia and Malcolmia africana (Brassicaceae)
Autorzy:
Karimmojeni, H.
Taab, A.
Rashidi, B.
Bezrafshan, A.H.
Powiązania:
https://bibliotekanauki.pl/articles/66908.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
seed dormancy
seed germination
annual plant
weed
Thlaspi arvense
Descurainia sophia
Malcolmia africana
African mustard
Brassicaceae
Opis:
In Iran, Descurainia sophia, Malcolmia africana, and Thlaspi arvense are abundantly found as importunate weeds in winter cereal. Understanding the timing of seed germination under natural conditions is crucial for learning how to manage these annual weeds. Therefore, this study was conducted to evaluate the effect of soil burial, dry storage, cold stratification, KNO3, GA3, and scarification on the seed dormancy and germination of these three species. Species had significantly different responses to the treatment. In D. sophia, seeds buried at a depth of 10 cm for 60 days (55%), and seeds dry stored at 20°C for 180 days (45%) showed the highest level of germination. In M. africana, the germination percentage reached 95% when seeds buried at a depth of 1 cm were soaked in a GA3 concentration of 150 ppm. T. arvense had the lowest level of germination compared to the other species. The highest percentage of T. arvense germination was obtained in seeds treated with 150 ppm GA3. Potassium nitrate partly increased germinability in seeds of M. africana, which initially were less dormant than those of T. arvense and D. sophia.
Źródło:
Journal of Plant Protection Research; 2014, 54, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dormancy breaking, germination, and seedling emergence from seeds of Crataegus submollis
Autorzy:
Bujarska-Borkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/41762.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
hawthorn
Crataegus submollis
seed
seedling emergence
germination
dormancy breaking
stratification
scarification
desiccation
storage
Opis:
Effects of several stratification variants on seed dormancy breaking were compared in Crataegus submollis Sarg. (hairy cockspur-thorn or Quebec hawthorn). Ripe seeds were collected (in October), cleaned, and dried to a moisture content of 7–12%. Seed dormancy in this species was broken most effectively by warm-cold stratification of nutlets, in a substrate or without any substrate, at 15~25°/3°C or 20~30°/3°C, i.e. with a cyclically alternating warm stage (16+8 hrs or 24+24 hrs/cycle) lasting 16–20 weeks, followed the cold stage lasting ca. 20 weeks, i.e. till the appearance of the first germinating seeds. After stratification, emergence rate is equally high (ca 50%) at cyclically alternating temperatures of 3~15°C and 3~20°C (16+8 hrs). Chemical scarification of nutlets in 96% sulphuric acid for 3 hrs, followed by warm-cold stratification at 20~30°/3°C, with a short, 4-week warm stage, also ensures a high emergence rate (58%). Seed desiccation (in nutlets) slowly to a moisture content of 10–12%, after stratification in a substrate or without any substrate as well as after scarification, results in a reduced emergence rate, especially if seeds are dried to the lower moisture content. Seed storage (in nutlets after drying to a moisture content of 10%) for 10 years at –3°C, does not decrease the emergence rate (93%) after stratification at 20~30°/3°C in a substrate, with a cyclically alternating warm stage (24+24 h) lasting 16 weeks.
Źródło:
Dendrobiology; 2007, 58; 9-15
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dormancy breaking in Savin juniper [Juniperus sabina L.] seeds
Autorzy:
Tylkowski, T
Powiązania:
https://bibliotekanauki.pl/articles/56737.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
stratification
dormancy breaking
seed dormancy
seedling
propagation
Savin juniper
shrub
natural stand
Pieniny Mountains
Juniperus sabina
seed
vegetation season
Opis:
Savin juniper (Juniperus sabina L.) is a relict shrub in Poland with only one natural stand in Pieniny Mts. Se- eds require warm followed by cold stratification to overcome dormancy. Application of temperature regime at 20°/3°C layout, for 14 and 17 weeks respectively, is more effective than stratification at 15°/3°C. Interruption of warm stratification phase after 7 weeks and seeds drying at room temperature for 3-days with warm stratification follow-on resulted in increasing of germination capacity from 25% to approximately 45%. Germinated seeds pricked to substrate into containers gave seedlings 3 cm high when cultivated under plastic tunnel in the first vegetation season.
Źródło:
Acta Societatis Botanicorum Poloniae; 2010, 79, 1; 27-29
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dormancy release and germination in recalcitrant Aesculus hippocastanum seeds
Autorzy:
Obroucheva, N V
Lityagina, S.V.
Powiązania:
https://bibliotekanauki.pl/articles/41724.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
dormancy
germination
cytokinin
growth initiation
seed
Aesculus hippocastanum
horse chestnut
embryo dormancy
Balkan Peninsula
Opis:
The investigation of dormancy release in Aesculus hippocastanum seeds was aimed at estimating the proportion of coat-imposed to embryo dormancy, and studying the growth initiation providing embryo dormancy release. During winter, horse chestnut seeds exhibited 16–17 week-lasting deep dormancy, which predominantly was determined by coat-imposed dormancy. Embryo dormancy lasted for 11–12 weeks of wet cold stratification. Embryo dormancy was weak, even the embryo axes excised from deeply dormant seeds were capable of extending to the size exceeding the axis length in intact seeds at radicle protrusion. Embryo dormancy release manifested itself in gradually increasing growth capacity of both embryo axes and cotyledonary petioles. The growth initiation in horse chestnut seeds occurs only by cell elongation. During growth initiation, a more rapid fresh weight gain was observed in comparison with length increment, thus indicating that accumulation of osmotically active substances and active water uptake by embryo axis cells were ahead of their increasing longitudinal cell wall extensibility. Cell wall loosening appeared to be directly related to embryo dormancy release. The hormonal regulation of embryo dormancy release in horse chestnut seeds is discussed.
Źródło:
Dendrobiology; 2007, 57; 27-33
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of epicotyl emergence of Quercus robur from different climatic regions is strongly driven by post-germination temperature and humidity conditions
Autorzy:
Jastrzebowski, S.
Ukalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2077749.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
epicotyl dormancy
Richards models
growth models
acorns
ecological niche
Opis:
Pedunculate oak (Quercus robur L.) is an important component of temperate forests in the north- ern hemisphere. It occurs naturally across Europe and in parts of North Africa, the Balkans, the Urals and the Caucasus. In Poland, it predominantly grows on the plains at ≤700 m a.s.l. The main objective of this study was to determine how different temperature-humidity growth conditions influence dormancy breakage and epicotyl emergence in Q. robur, using growth curve models. We also in- vestigated whether these differences result from changes in the climatic conditions under which the oak populations grow naturally. In this study, we selected four pedunculate oak stands in western and eastern Poland. These sites were char- acterised by oceanic and continental climates, respectively. Mature acorns were collected in the autumn of 2016 and pretreated for two weeks in the cold (4 °C). The acorns were then sown in plastic pots filled with a peat/sand substrate. Four climatic variants (cold-dry, cold-wet, warm-dry and warm-wet) and a control (average conditions) were used. Epicotyl emergence was monitored daily for 74 days. Epicotyl emergence dynamics (maximum absolute growth rate, lag time, T50), number of days to epicotyl emergence, and cu- mulative epicotyl emergence were measured or calculated. The acorns from oceanic climates required more intense warm humid conditions for epicotyl emergence than those from continental climates. In contrast, acorns from continental climates had an evolutionary advantage in that their epicotyl emergence occurred both in cold-dry and warm-wet seasons. This indicated that each population was adapted to its local environment.
Źródło:
Dendrobiology; 2019, 81; 73-85
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of air temperature on forecasting the start of Cupressaceae pollen type in Ponferrada [Leon, Spain]
Autorzy:
Fuertes-Rodriguez, C R
Gonzales-Parrado, Z.
Vega-Maray, A.M.
Valencia-Barrera, R.M.
Fernandez-Gonzales, D.
Powiązania:
https://bibliotekanauki.pl/articles/50902.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
Ponferrada
woody plant
pollen
aerobiology
heat requirement
Leon
Cupressaceae
forecast
chilling requirement
Spain
dormancy
Opis:
In order to survive periods of adverse cold climatic conditions, plant requirements are satisfi ed by means of physiological adaptations to prevent cells from freezing. Thus, the growth of woody plants in temperate regions slows down and they enter into a physiological state called dormancy. In order to identify the chilling and heat requirements to overcome the dormancy period of Cupressaceae pollen type in the south of Europe, we have carried out our study with aerobiological data from a 10-year (1996- 2005) period in Ponferrada, León (Spain). For the chilling requirements the best result was with a threshold temperature of 7.1ºC and an average of 927 CH. Calculation of heat requirements was carried out with maximum temperature, with 490 growth degree days (GDD) needed, with a threshold temperature of 0ºC. We have used the 2002-2003, 2003- 2004 and 2004-2005 periods in order to determine the real validity of the model. We have not used these years in developing the models. The dates predicted differ in only a few days from those observed: in 2002-2003 there was a difference of 11 days, in 2003-2004 predicted and observed dates were the same, but in 2004-2005 the difference obtained was of 43 days.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of scarification on breaking seed dormancy and germination enhancement in Annona muricata L. (Magnoliales: Annonaceae)
Autorzy:
Dada, C. A.
Kayode, J.
Arowosegbe, S.
Ayeni, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/1075444.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Annona muricata
Annonaceae
Dormancy
germination
scarification
Opis:
The effect of various scarification method on breaking seed dormancy and germination enhancement in Annona muricata (Magnoliales: Annonaceae) was examined in this study via: mechanical scarification with sandpaper, file and stone; chemical scarification with 10, 25 and 50% H2SO4 for 5 seconds respectively; exposure to wet heat (hot water) for 1, 3 and 5 seconds; exposure to cold treatment by chilling in refrigerator of 4 ºC for 12, 18 and 24 hours; soaking in coconut water for 5, 10 and 15min and untreated seeds as the control. The results of the experiment showed that chemical scarification with H2SO4 at 50% for 5 seconds had significantly highest percentage germination (60%). This was followed by the seeds soaked in coconut water for 15 minutes (39.69). Seeds treated with 25% H2SO4 for 5 seconds had 30% germination. Other treatment were less or not effective. Untreated seeds had the least percentage germination (6%) with mean germination time of 40.20 and germination index of 0.27. The treatments that gave significantly higher germination percentages also produce low Mean Germination Time (30.01) and increased Germination Index (12.26). These characters shows that chemical scarification with H2SO4 at 50% for 5 seconds was the most effective treatment to break dormancy and enhancing seed germination in this species as revealed in this study.
Źródło:
World Scientific News; 2019, 126; 136-147
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of dormancy breaking in stored seeds on germinability and seedling emergence of Tilia platyphyllos
Autorzy:
Tylkowski, T
Powiązania:
https://bibliotekanauki.pl/articles/41170.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
dormancy breaking
seed
stored seed
germinability
seedling emergence
Tilia platyphyllos
scarification
stratification
seed viability
Opis:
Fruits of large-leaved lime dried to 10% may be stored for 16 years in sealed containers at –3°C without loosing seed viability. Dormancy of seeds, extracted from hard fruit coats, may be released after chemical scarification in concentrated sulphuric acid for 10 minutes, followed-by stratification without any medium (chilling) at the temperature of 3°C, for 20–24 weeks, i.e. until the first seeds start to germinate. After such pretreatment, during the germination test conducted at alternating temperatures 3~15°C (16 + 8 hours/day) seeds germinate near 90% in several weeks. For seedling production scarified and stratified seeds should be sown in early spring into trays under a plastic tunnel which ensures a high percentage of seedlings emergence. Sowing of the pretreated seeds in spring in a open nursery gives poor results.
Źródło:
Dendrobiology; 2006, 56; 79-84
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

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