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Wyszukujesz frazę "Seed germination" wg kryterium: Temat


Wyświetlanie 1-12 z 12
Tytuł:
Evaluation of milk thistle (Silybum marianum (L.) Gaertn.) seed germination in relation to seed health and seedling emergence
Autorzy:
Rosinska, A.
Dorna, H.
Szopinska, D.
Irzykowska, L.
Seidler-Lozykowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/71929.pdf
Data publikacji:
2018
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
medicinal plant
milk thistle
Silybum marianum
seed germination
seed health
seedling emergence
Opis:
Milk thistle (Silybum marianum (L.) Gaertn.) is an important medicinal plant. Achenes of milk thistle contain sylimarin, protecting liver cells against toxic compounds. The aim of the research was to find an optimum method of evaluation of milk thistle seed germination. Ten seed samples were tested. The seeds were germinated: on top of blotter paper, on top of blotter paper after seed disinfection, between pleated blotter paper, in rolled blotter paper and in sand. Germination at the first and final counts, the percentages of abnormal seedlings and dead seeds were determined. The correlation coefficients between seed germination, evaluated with various methods, and seedling emergence were calculated. Moreover, fungi associated with seeds and diseased seedlings were identified. The lowest percentage of normal seedlings was observed after germination on the top of blotter. Highly significant positive correlations were noted between seedling emergence and seed germination at the final count evaluated in rolled paper, between pleated paper and in sand. The fungi from genera:Alternaria, Fusarium, Penicillium, Trichoderma, Ulocladium and Verticillium were frequently identified on seeds and seedlings. Infestation with fungi significantly affected milk thistle seed germination and plant emergence. Germination in rolled blotter paper may be recommended for evaluation of milk thistle seed germination, as the most practical and significantly correlated with seedling emergence.
Źródło:
Herba Polonica; 2018, 64, 3
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving seed germination and seedling emergence in the Juniperus communis
Autorzy:
Tylkowski, T
Powiązania:
https://bibliotekanauki.pl/articles/41555.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
juniper
Juniperus communis
seedling emergence
seed germination
seed cone
propagation
individual variability
natural regeneration
Opis:
The observed juniper decline, lack of natural regeneration, and disappearance of numerous populations of the common juniper in Poland, were the major reasons for initiation of research on its sexual propagation and seedling production. This study shows that seed dormancy in this species is broken by warm-cold stratification at 15°C/3°C, for 14+12 weeks, respectively. Seed drying for 72 h at room temperature in the middle of the warm phase (i.e. after 4–8 weeks of stratification at 15°C) and the following cold stratification at 3°C, cause a significant increase in seed germination capacity at cyclically alternating temperatures of 3~15°C, and in seedling emergence in growing trays (67 cells each) in a greenhouse. However, seedling emergence was over 2-fold to 4-fold lower in an open nursery than in the greenhouse. After sowing in the nursery, secondary dormancy was probably induced, because some seeds germinated in the following year. Some very young, 2-year-old seedlings started to produce male or rarely female cones. This study also showed that soil conditions of mother plants can influence the pattern of seed germination and seed ling emergence.
Źródło:
Dendrobiology; 2009, 61; 47-53
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser irradiation effects on scorzonera (Scorzonera hispanica L.) seed germination and seedling emergence
Wpływ promieniowania laserowego na kiełkowanie nasion i wschody siewek skorzonery (Scorzonera hispanica L.)
Autorzy:
Krawiec, M.
Dziwulska-Hunek, A.
Sujak, A.
Palonka, S.
Powiązania:
https://bibliotekanauki.pl/articles/11543036.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
scorzonera
Scorzonera hispanica
seed germination
seedling emergence
laser irradiation
irradiation effect
Opis:
Laser stimulation is a non-expensive and environmentally safe way of the improving of seeds quality. The objective of the study was to determine the effect of He-Ne laser irradiation on the germination parameters of scorzonera seeds. Seeds were characterized with different quality expressed by germination capacity. Experimental material consisted of 4 lots of scorzonera seeds having initial germination capacity between 50.8 and 93.0%. Seeds were treated with laser He-Ne light of surface power density of 3 mW·cm-2 and the time of exposition of 0 (control), 1, 5, 10 and 30 minutes. After pre-sowing stimulation of seeds the following parameters were estimated: germination energy, germination capacity, mean germination time, speed of germination, hypocotyl length, length of radicle, fresh and dry weight of seedling, field emergence, mean emergence time and speed of emergence. Pre-sowing laser treatment resulted in increasing of the several parameters such as germination energy, germination capacity, speed of germination, hypocotyl and radicle length, as well as fresh and dry weight of seedlings. Laser light stimulation was the most effective in the case of low quality seeds (initial germination capacity of 50.8%). Irradiation of the seeds belonging to this group also resulted in the increase of the seedling emergence and the speed of emergence.
Stymulacja laserowa jest tanim i bezpiecznym dla środowiska sposobem uszlachetniania nasion. Celem badań było określenie wpływu przedsiewnej stymulacji laserem He-Ne na kiełkowanie charakteryzujących się różną jakością nasion skorzonery oraz na wschody siewek. Jakość nasion wyrażono za pomocą zdolności kiełkowania. Materiałem do badań były nasiona 4 partii skorzonery o początkowej zdolności kiełkowania od 50.8 do 93.0%. Nasiona skorzonery stymulowano światłem lasera He-Ne o powierzchniowej gęstości mocy 3 mW·cm-2 w czasie 0 (kontrola), 1, 5, 10 i 30 min. Po stymulacji laserowej oceniono energię kiełkowania, zdolność kiełkowania, średni czas kiełkowania, szybkość kiełkowania, długość hypokotylu i korzenia siewki, świeżą i suchą masę siewki, wschody polowe, średni czas wschodów i szybkość wschodów. Traktowanie nasion światłem lasera wpłynęło na wzrost energii i zdolności kiełkowania, wzrost szybkości kiełkowania, wydłużenie hypokotylu i korzenia siewki oraz zwiększenie świeżej i suchej masy siewek wykształconych z tych nasion. Stymulacja światłem lasera najefektywniej wpłynęła na poprawę zdolności kiełkowania nasion niskiej jakości (o wyjściowej zdolności kiełkowania 50.8%). Naświetlanie nasion należących do tej partii spowodowało również zwiększenie wschodów i wzrost szybkości wschodów.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2015, 14, 2; 145-158
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ hydrokondycjonowania na aktywność metaboliczną oraz kiełkowanie nasion i wschody siewek marchwi
Effects of hydropriming on metabolic activity, seed germination and seedling emergence of carrot
Autorzy:
Grzesik, M.
Janas, R.
Powiązania:
https://bibliotekanauki.pl/articles/337351.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
hydrokondycjonowanie
aktywność metaboliczna
kiełkowanie
nasiona
wschody
marchew
hydropriming
metabolic activity
seed germination
seedling emergence
carrot
Opis:
Celem przeprowadzonych doświadczeń było zbadanie wpływu czterech metod hydrokondycjonowania, z uwzględnieniem etapowości moczenia, na wartość siewną nasion marchwi 'Amsterdamska'. W tym celu komercyjne nasiona tej odmiany uwadniano czterema metodami w temperaturze 20oC, metodą jednoetapowego lub dwuetapowego moczenia przez 2, 4, 6, 12 i 24 godziny lub w dawkach napowietrzanej wody do różnych wilgotności (10 do 52%). Uwilgotnione nasiona wymienionymi metodami inkubowano następnie w temperaturze 18-20oC w hermetycznych pojemnikach przez 1, 2, 4 lub 6 dni, codziennie je przewietrzając i oceniając ich wilgotność metodą suszarkową. Następnie oceniono ich wartość siewną na podstawie dynamiki, zdolności i średniego czasu kiełkowania w 20oC, przepuszczalności membran cytoplazmatycznych, ogólnej aktywności dehydrogenaz, dynamiki wschodów, liczby wzeszłych siewek i ich wysokości po 18 dniach od wysiewu. Uzyskane wyniki wskazują, że nasiona marchwi 'Amsterdamska' uwodnione do około 40% zawartości wody oraz inkubowane w 20oC przez okres 2-4 dni i następnie wysuszone do wilgotności wyjściowej charakteryzują się wysokim wigorem, szybciej kiełkują, często w większym procencie, a uzyskane z nich siewki szybciej wschodzą i rosną niż siewki z nasion kontrolnych. Szybkie wnikanie wody do zarodków nie uszkadza membran cytoplazmatycznych.
The aim of the experiments has been to investigate the effect of four methods of hydroconditioning, including single and two-step soaking, on the carrot 'Amsterdamska' seeds quality. For this purpose, the commercial seeds of this variety have been hydrated with four methods at 20°C, using a single or two-step soaking for 2, 4, 6, 12 and 24 hours or in doses of the aerated water to the different moisture content (10 to52%). Next, the moistened seeds with the mentioned methods have been incubated at 18-20oC in airtight containers for 1, 2, 4 or 6 days, with daily aeration and assessing their moisture content. Then, the hydroprimed seeds have been examined by the evaluation of the dynamics and number of germinated seeds, mean time of seed germination at 20°C, permeability of cytoplasmic membranes, total activity of dehydrogenases, dynamics of emergence, number of emerged seedlings and their height after 18 days after sowing. The results indicate that the carrot 'Amsterdamska' seeds after hydration up to 40% of water content and incubation at 20°C for 2-4 days and drying down to an initial moisture content, affects in the higher vigor of seeds, accelerate their germination, often in greater percentages and accelerate emergence and growth of seedlings. Rapid penetration of water into the embryos does not damage the cytoplasmic membranes.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2011, 56, 3; 127-132
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skuteczność przedsiewnych metod skaryfikacji nasion robinii akacjowej
Effectiveness of pre-sowing scarification methods of black locust seeds
Autorzy:
Tylkowski, T.
Grupa, R.
Powiązania:
https://bibliotekanauki.pl/articles/1009551.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
nasiennictwo
drzewa
robinia akacjowa
Robinia pseudoacacia
skaryfikacja nasion
skutecznosc
nasiona
zdolnosc kielkowania
wschody
robinia pseudoacacia
seed germination
scarification
seedling emergence
Opis:
Dormancy of black locust seed is exogenous imposed by hard seed coat a physical barrier to water enters to embryo. Seeds need scarification of seed coat before sowing. In practice, this can be done in different (thermal, mechanical, chemical and natural) methods. Effects of the previous two of them were compared on laboratory germination capacity and seedling emergence in the forest nursery. Statistically higher germinability and seedling emergence were obtained after mechanical scarification of seeds. After inconsiderable modification, the device for mechanical seed extraction from larch cones can be used as mechanical scarifier of black locust seeds.
Źródło:
Sylwan; 2010, 154, 01; 33-40
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Betula pendula seed storage and sowing pre-treatment: effect on germination and seedling emergence in container cultivation
Autorzy:
Tylkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/41787.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Betula pendula
seed storage
sowing
pretreatment
germination
seedling emergence
container cultivation
Opis:
Irregular seed crop in Betula pendula (Silver Birch) is a reason to create seed reserves, ensuring nursery production in years of crop failure. This study investigated the effects of seed moisture content and storage temperature on germinability and seedling emergence in container cultivation. Mature catkins were collected separately from 3 trees. The mixture of winged nuts and scales was dried to 3 levels of moisture content and stored at 3°C, –3°C and –10°C. After storage for 3, 5 and 6 years, the seeds were separated from scales and next dewinged and sorted in acetone into empty and filled seeds. Cleaned nuts were germinated in the Jacobsen germinator. Besides, to assess seedling emergence, seeds were sown on the surface of peat mixed with perlite, in multi-cell trays under a plastic tunnel. Significant differences in germinability were detected depending on the mother tree, seed moisture content and storage time. The viability of seeds stored at –10°C remained unchanged for 6 years regardless of moisture content (ca. 8–12%). Seeds stored at higher temperatures lost their germinability faster. An unexplained increase in seedling emergence was observed after extended seed storage at –10°C, in contrast to a gradual decrease in seedling emergence after extended storage at –3°C.
Źródło:
Dendrobiology; 2012, 67
1641-1307
Pojawia się w:
Dendrobiology
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:
Seed dormancy breaking in Crataegus pedicellata
Autorzy:
Bujarska-Borkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/41623.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
scarlet hawthorn
Crataegus pedicellata
seed dormancy breaking
stratification
scarification
germination
seedling emergence
desiccation
Opis:
The effects of stratification and scarification on seed dormancy breaking were compared in scarlet hawthorn (Crataegus pedicellata Sarg. = C. coccinea L). Ripe fruits were collected (in October) and the extracted nutlets were cleaned, and dried to a moisture content of 9–12%. Seed dormancy in this species was broken most effectively by warm-followed-by-cold stratification of nutlets, in a substrate or without any substrate, as well as at 15~25° or 20~30°C, i.e. with a cyclically alternating warm stage (16+8 hrs or 24+24 hrs/cycle) lasting 16–20 weeks, followed by the cold stage at 3°C lasting ca. 20 weeks, i.e. till the appearance of the first germinating seeds. After stratification, emergence rate is equally high (ca 76%) at cyclically alternating temperatures of 3~15°C or 3~20°C (16+8 hrs). Chemical scarification of nutlets in 96% sulphuric acid for 2 hrs, followed by warm-cold stratification at 20~30°/3°C, with a short, 4-weeks warm stage, also ensures a high emergence rate (85–93%). Seed desiccation (in nutlets) slowly to moisture content of 12–14%, after stratification in a substrate or scarification does not reduce the seedling emergence of seeds. Emergence decreased when seeds were desiccated after stratification without any substrate. Results provide new methods of breaking of dormancy and high germination and emergence of hard-coated Crataegus seeds in controlled conditions.
Źródło:
Dendrobiology; 2008, 60; 51-56
1641-1307
Pojawia się w:
Dendrobiology
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:
Physiological method for improving seed germination and seedling emergence of root parsley in organic systems
Fizjologiczne metody poprawy kiełkowania nasion i wschodów siewek pietruszki korzeniowej w systemach ekologicznych
Autorzy:
Grzesik, M.
Janas, R.
Powiązania:
https://bibliotekanauki.pl/articles/337279.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
parsley
hydroconditioning
seed
germination
seedling emergence
growth
pietruszka korzeniowa
hydrokondycjonowanie
nasiono
kiełkowanie
siewka
wschody
wzrost
Opis:
The aim of the experiments was to determine the optimal parameters of hydroconditioning of root parsley ’Berlińska’ seeds and an indication of how the moisture content and the time of incubation affect the dynamics of germination, physiological activity, emergence and growth of seedlings. Seeds were hydrated at 20°C, at different doses of distilled water, from the ini-tial moisture content of 8% up to 30 , 35 and 45%. Then, they were incubated at 20°C, in airtight containers for 1, 3 and 6 days, with daily ventilating and assessing moisture content. After that, their sowing value was assessed on the basis of dy-namics of germination at 20°C, mean time of germination, cytoplasm membrane permeability, total dehydrogenase activity, dynamics of emergence, the number of emerged seedlings and their height 45 days after sowing, as well as index of chloro-phyll content and net photosynthesis in leaves. The results indicated that hydroconditioning greatly increased the dynamics and the percentage of seed germination and seedling emergence of parsley 'Berlińska'. Seeds hydrated up to about 45% and incubated at 20°C for a period of 3 or 6 days, and then dried down to the initial moisture content, were more vigorous, germinated more quickly and in higher percentage. They showed the higher enzyme activity and lower permeability of membranes. The obtained from them seedlings emerged and grew faster, contained more chlorophyll and exhibited the higher photosynthetic activity than seedlings from control.
Celem badań było określenie optymalnych parametrów hydrokondycjonowania nasion pietruszki korzeniowej "Berlińska" oraz wskazanie, jak stopień ich uwilgotnienia i czas inkubacji wpływa na dynamikę kiełkowania, aktywność fizjologiczną, wschody i wzrost roślin. Nasiona uwilgotniono w 20°C, w odpowiednich dawkach wody destylowanej, od wilgotności wyjściowej 8% do 30, 35 i 45%. Następnie inkubowano je w temperaturze 20°C, w hermetycznych pojemnikach przez 1, 3 i 6 dni, codziennie przewietrzając i oceniając ich wilgotność. W kolejnym etapie określono ich wartość siewną na podstawie dynamiki kiełkowania w temperaturze 20°C, średniego czasu kiełkowania, przepuszczalności błon cytoplazmatycznych, całkowitej aktywności dehydrogenaz i dynamiki wschodów siewek. Po 45 dniach od wysiewu oceniono wysokość siewek oraz indeks zawartości chlorofilu i aktywność fotosyntezy netto w liściach. Uzyskane wyniki wykazały, że hydrokondycjonowanie znacznie zwiększyło dynamikę i zdolność kiełkowania nasion oraz dynamikę wschodów i wzrost roślin pietruszki korzeniowej. Nasiona uwilgotnione do 45% i inkubowane w 20°C przez okres od 3 do 6 dni i następnie suszone do wilgotności wyjściowej, skiełkowały szybciej i w większym procencie. Charakteryzowały się one również wyższą aktywnością enzymatyczną i niższą przepuszczalnością błon cytoplazmatycznych. Uzyskane z nich siewki wschodziły i rosły szybciej oraz zawierały więcej chlorofilu. Aktywność fotosyntezy netto była w nich wyższa, niż w siewkach uzyskanych z nasion nie kondycjonowanych.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2014, 59, 3; 80-86
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed storage, germination and seedling emergence in Rhamnus catharticus
Autorzy:
Tylkowski, T
Powiązania:
https://bibliotekanauki.pl/articles/41131.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
common buckthorn
Rhamnus catharticus
North America
seed storage
germination
seedling emergence
invasive species
landscape shrub
shrub
tree
medicinal plant
Opis:
This study was aimed to improve the understanding of germination ecology and to explain the invasive character of the common buckthorn (Rhamnus catharticus) in North America. Its fully mature seeds are characterized by a lack of dormancy. In laboratory conditions, favourable thermal conditions were identified for seed storage, germination and seedling emergence. At the cyclically alternating temperature of 20~30°C (16+8 h daily), seeds of this species showed a high germination rate within few weeks. Two other thermal variants, 3~15°C and 3~20°C (16+8 h daily), were much less effective for seed germination. However, cold stratification (at 3°C) in a moist mixture of peat and sand, lasting 4–8 weeks, caused a remarkable increase in germination rate also at 3~15°C. Seeds extracted from ripe fruits and dried (to a moisture content of about 10%) showed high germination and emergence rates after storage for 3.5 years at –3°C.
Źródło:
Dendrobiology; 2007, 58; 67-72
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed dormancy breaking in Crataegus laevigata
Autorzy:
Bujarska-Borkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/41708.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
scarification
stratification
germination
seedling emergence
desiccation
storage
seed dormancy breaking
Crataegus laevigata zob.Crataegus oxyacantha
tree species
shrub species
Crataegus oxyacantha
Opis:
Laboratory experiments were made to determine the optimum conditions for dormancy breaking in the midland hawthorn (Crataegus laevigata (Poir.) DC. = C. oxyacantha L.). Its small applelike fruits should be collected when they are fully ripe (in Poland in October). The nutlets extracted from the fruits must be dried at room temperature to the moisture content of 9–13%. The dormancy of midland hawthorn seeds can be overcome by: (1) stratification in a moist medium: 20~30°C/3°C, 16–20 weeks at 20~30°C (16+8 hrs or 24+24 hrs) followed by 16–18 weeks at 3°C, i.e. to the time when first radicles start to appear; or (2) chemical scarification in concentrated sulphuric acid for 2 or 3 hrs, followed by warm stratification at 27.5°C or 20~30°C for 4 weeks and cold stratification at 3°C, lasting 19–21 weeks, i.e. to the time when first radicles start to appear. The stratified seeds germinate vigorously (in 3–5 weeks) and at a high percentage at temperatures of 3~15°C or 3~20°C (16+8 hrs) and all seedlings emerge in such conditions about 4–6 weeks after sowing. Seed germination after stratification or scarification can be stopped by partial desiccation of seeds. Seed desiccation after stratification to the moisture content of 10–13% and sealed storage at –3°C for one year do not reduce seed germination and seedling emergence rates of the previously pretreated seeds. Storage for 20 months at –3°C of seeds dried after harvest to the moisture content of 14% does not reduce their germination and seedling emergence.
Źródło:
Dendrobiology; 2006, 56; 3-11
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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