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Wyświetlanie 1-15 z 27
Tytuł:
Gene pool conservation programme of Norway spruce Picea abies (L.) Karst. in the Beskid Mts
Autorzy:
Jurasek, M
Powiązania:
https://bibliotekanauki.pl/articles/41497.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Czech Republic
Czech State Forests
Norway spruce
Picea abies
conservation
reproduction
seed orchard
clone
artificial regeneration
seed stand
gene pool conservation
conservation programme
seed bank
Opis:
The paper describes the measures adopted by the Czech State Forests for the conservation and reproduction of the Norway spruce gene pool in the Moravian-Silesian Beskid Mts. In addition to the assurance of natural regeneration in genetically valuable stands and the use of high-quality autochthonous stands as seed sources for artificial regeneration, the measures include selection of plus-trees, establishment of seed orchards, seed stands and clone archives, and identification of gene pools. Seeds of the most valuable regional populations are deposited in a seed bank.
Źródło:
Dendrobiology; 2004, 51 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conservation of genetic resources of Sorbus torminalis in Poland
Autorzy:
Bednorz, L
Powiązania:
https://bibliotekanauki.pl/articles/41249.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
genetic resource
conservation
tree
Rosaceae
wild service tree
Sorbus torminalis
forest tree
Polska
Opis:
The paper presents the proposal of a strategy of conservation of genetic resources of wild service tree (Sorbus torminalis) in Polish forests. Some results of the recent studies on distribution, resources and genetic variability of wild service tree in Poland that make a scientific base of the programme are presented. Both in situ and ex situ methods should be applied in conservation of genetic resources of S. torminalis. Conservation affords should first to be focused on forest management oriented in favor of wild service tree (e.g. logging intervention, competition control, preparing of favorable sites for new establishments). Further, in situ measures should include selection of conservation areas (natural gene reserves) and preserving trees of the best quality (protected genotypes). These objects would provide seeds for new establishments and to feed populations of small size. The genotypes of the selected earlier preserving trees (about 250–300) would be protected in ex situ conservation objects – seedling and clonal seed orchards. These plantations would also provide seeds needed for future establishments. The genotypes of endangered populations or single trees of S. torminalis could be preserved in the Forest Gene Bank in Kostrzyca.
Źródło:
Dendrobiology; 2007, 58; 3-7
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chorological and conservation status of the endemic cypress, Cupressus atlantica Gaussen, in the High Atlas (Morocco)
Autorzy:
Sekiewicz, K.
Sekiewicz, M.
Romo, A.
Didukh, Y.
Fennane, M.
Boratynski, A.
Powiązania:
https://bibliotekanauki.pl/articles/41144.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
chorology
conservation status
endemic plant
cypress
Cupressus atlantica
Cupressaceae
forest ecosystem
degraded ecosystem
High Atlas Mountains
plant conservation
plant geography
Morocco
Opis:
We present a study of the distribution, ecology and conservation status of Cupressus atlantica, an endemic tree of the High Atlas (Morocco). The main populations of this species grow in a reduced area along the N’Fiss valley in the Central High Atlas and are gradually receding. Particular populations are increasingly fragmented and the total area covered by the cypress woodland has decreased to less than a third of the surface occupied in the 1930s. Overgrazing reduces the woodlands’ regenerative capacity, and the exploitation of the wood, linked to traditional uses by the rural society of the N’Fiss valley, directly reduces the number of trees. Great efforts being made to protect the species by the Haut Commissariat aux Eaux et Forêts are having some effect in recent years.
Źródło:
Dendrobiology; 2014, 71
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Salix myrtilloides in north central Poland. Distribution, threats and conservation
Autorzy:
Churski, M
Danielewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/41057.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
glacial relict
willow
Polska
locality
habitat loss
Salix myrtilloides
distribution
threat
conservation
habitat protection
gene pool
strategy
Opis:
Present status of a postglacial relict – Salix myrtilloides L. was investigated in north central Poland at 27 localities. Consequently 3 sites were confirmed, 4 were not confirmed, and the remaining 20 were considered to be extinct. In comparison to the historical distribution, ca. 74% of the sites existing 50 years ago do not exist today in the studied region. The confirmed populations were found near Oporówek (ca. 1600 stems), Rakowiec (ca. 100) and Bobrowo (15). At three sites confirmed in this study, the existence of vigorous hybrids between S. myrtilloides and S. aurita L. (S. ×onusta Besser) were observed. The most important threats to Salix myrtilloides L. populations in the studied region were assessed to be hybridization with other commonly occurring willow species, site isolation and habitat destruction. Natural habitat protection with adequate buffer zone and gene pool protection in a form of plantations was suggested as a conservation strategy. As an alternative strategy active protection ‘insitu’ was proposed based on cutting competitive common species of willows.
Źródło:
Dendrobiology; 2008, 60; 3-9
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecology and conservation status of Taxus baccata population in NE Chalkidiki, northern Greece
Autorzy:
Katsavou, I.
Ganatsas, P.
Powiązania:
https://bibliotekanauki.pl/articles/41599.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
ecology
conservation status
Taxus baccata
European yew
plant population
stand structure
forest regeneration
radial growth
Chalkidiki Peninsula
Greece
Opis:
Taxus baccata L. is a rare species threatenedwith extinction in Greece, as in other parts of Europe. This paper deals with the ecological status of the species in the area of NE Chalkidiki northern Greece, where the species appears in one of the greatest populations of the country. Site, standand yew population characteristics were studied in the area that species occupies. Eleven sample plots were marked, and on each plot, the height and diameter at breast height (DBH) were measured for all yew trees, as well as for all the individuals of the rest tree species, with diameter at breast height greater than 4 cm. Tree vitality of all trees was also estimated according to IUFRO classification. Yew radial growth was studied using tree-ring analysis. Tree natural regeneration was investigated within subplots of different dimensions and according to two height classes. Results showed that yew population occurs in stands dominated by beech, presenting a mean density of 301 trees per hectare, with a total population of 430 trees with DBH above 4 cm. It forms the secondary stand, and dominates in the stand understorey, accompanied with Fagus sylvatica and Ilex aquifolium, while it appears rarely in the overstorey. Yew tree vitality was foundto be quite high, and significantly higher than that of beech. Radial growth of the sampled trees follows a slow and constant annual increment gradually decreasing by tree age. Yew natural regeneration was foundto be relatively low, 1341.8 individuals (seedlings and saplings up to 1 m) per hectare. Management and in situ conservation of the species in the area should focus on species protection measures, andon specific silvicultural treatments for creating favourable conditions for species growth.
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autovegetative reproduction in conservation and selective cultivation of Norway spruce Picea abies (L.) Karst of Istebna race
Autorzy:
Rylski, K
Powiązania:
https://bibliotekanauki.pl/articles/41485.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
autovegetative reproduction
plant reproduction
conservation
selective cultivation
Norway spruce
Picea abies
forest tree
rooting experiment
cutting
progeny
Opis:
The paper discusses the results of rooting experiments conducted with the cuttings obtained from 8-year-old spruce trees of Istebna race. The studies investigated the effects of endogenous factors, such as the place of extraction, length and origin of cuttings, and an exogenous factor, which is a rooting stimulus.
Źródło:
Dendrobiology; 2004, 51 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abies semenovii in North West Russia: taxonomy, ecology, cultivation and conservation
Autorzy:
Orlova, L.
Firsov, G.
Egorov, A.
Volchanskaya, A.
Powiązania:
https://bibliotekanauki.pl/articles/41119.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Abies semenovii
rare species
Russia
taxonomy
ecology
plant cultivation
conservation
morphology
botanical garden
Red Data Book
Saint-Petersburg city
Opis:
Semenov’s Fir (Abies semenovii B. Fedtsch.) is an extremely rare species in the wild and is included in the International Red List of Conifers and into the Red Data Books of the former USSR and Kyrgyz Republic. Our investigation confirms that this is an independent species, related but not identical to Abies sibirica Ledeb. It has been cultivated at Peter the Great Botanic Garden of the Komarov Botanical Institute of the Russian Academy of Science(s), St.Petersburg, since 1949. Apparently, it was here that Semenov’s Fir was first introduced into cultivation in European gardens. It has produced seeds since 2000, when it was less than 43 years old. It is a hardy and ornamental tree that deserves wider distribution in cultivation in the gardens and parks of North-West Russia. It is proposed that Semenov’s Fir should be given independent taxonomic status as a separate species, Abies semenovii B. Fedtsch.
Źródło:
Dendrobiology; 2016, 75
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of North African Thymus algeriensis in Tunisia: Population structure and implication for conservation
Autorzy:
Ben El Hadj Ali, I.
Guetat, A.
Boussaid, M.
Powiązania:
https://bibliotekanauki.pl/articles/41188.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
genetic diversity
North Africa
Thymus algeriensis
Tunisia
population structure
molecular marker
natural population
conservation
Opis:
The genetic diversity within and among nine natural populations of Thymus hirtus Willd. subsp. algeriensis (Boiss. et Reut.) Murb. from different geographical and bioclimatic zones were assessed using Random Amplified Polymorphic DNA data. A total of 154 bands were generated from seven selected primers. 141 bands were polymorphic (P=91.56%). The genetic diversity within a population based on Shannon's index which was high (H'pop=0.307) and varied according to bioclimatic zones. A high genetic differentiation among populations (GST=0.335 and FST=0.296) was revealed, suggesting a population isolation and a low level of gene flow among them. The major proportion of the variation was attributable to individual differences within populations. The genetic structure is in accordance with geography distances. The Neighbour- joining tree based on Nei's and Li's genetic distance among individuals showed that individuals from each population clustered together. The UPGMA dendrogram based on FST values revealed three clusters each of them includes populations closuring to their geographical origin. The high genetic structure of populations resulted from genetic drift caused both by the habitat fragmentation and the low size of most populations. The in situ conservation should interest all populations. The ex situ conservation should be based on the collection of seeds rather within than among populations because of the maximum of variation was revealed within populations.
Źródło:
Dendrobiology; 2012, 67
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gene conservation and breeding programmes for Picea abies in Lithuania: present-day achievements
Autorzy:
Danusevicius, J
Gabrilavicius, R.
Danusevicius, D.
Powiązania:
https://bibliotekanauki.pl/articles/41718.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
international conference
Europe
forest ecosystem
plant breeding
tree
Norway spruce
Picea abies
breeding programme
Lithuania
gene conservation
genetic resource
provenance
plant population
Opis:
At present, Norway spruce stands occupy 22% of the total forest area in Lithuania. Most of them are located in the northeastern highland (Žemaitija) and the central part of the country. 25% of the spruce-dominated stands are pure, the rest are mixed. Natural calamities like storms, droughts, and pests cause substantial damage and occur quite frequently. About 40 thousand ha of stands are cut after each storm. The mean wood yield of the spruce stands is 304 m3 ha-1, and the current annual increment is 6.2 m3 ha-1. The climatic conditions of Lithuania are variable enough to cause differentiation of habitats. For Norway spruce, 6 provenance regions have been established. The national gene conservation programme is based on (a) in situ genetic reserves, seed collection stands, and selected genotypes, and (b) ex situ clonal archives, seed orchards, experimental plantations, and gene bank collections. The present-day breeding of Norway spruce comprises family tests of populations for individual and population selection, and plans for inter-population hybrids. A strategy for Norway spruce breeding has been approved for the years 2004-2013. There is a genetically diverse material for future breeding: long-distance provenance tests, and population and family tests. Assessments of two provenance tests (aged 9 and 17 years) in central Lithuania revealed superior performance of central and northeastern Polish provenances: superior height, good stem quality, and late bud-burst in spring. This may be attributed to the favourable effect of transfer: avoidance of spring frosts (late bud-burst and good stem quality), and utilisation of the later part of the growing period for growth (late bud-set and superior height). Norway spruce is a climax species with different domestic and Darwinian fitness. Therefore, we suggest that the domestic fitness of local genotypes may be improved by introducing a few Polish clones in Lithuanian breeding populations.
Źródło:
Dendrobiology; 2009, 61 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taxus baccata in Morocco: a tree in regression in its southern extreme
Autorzy:
Romo, Angel
Iszkuło, Grzegorz
Taleb, Mohammed Seghir
Walas, Łukasz
Boratyński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/956808.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
dakhs
ecology
forestry
phytogeography
plant conservation
niche modelling
Opis:
The knowledge on chorology of species is basic for biogeographic and ecological studies and for conservation actions. The data on the chorology of Taxus baccata in Morocco have not been studied. The bibliographic resources, herbarium material, unpublished data of several botanists and the authors’ field notes have been reviewed. Two yew populations on Jbel Lakrâa in the Rif and near Bekrit in the Middle Atlas were measured to verify demographic structure and health conditions. The Maxent model of predicted habitat based on bioclimatic variables was used to evaluate the potential geographic range of T. baccata. The species occurs in the mountain areas of northern Morocco: in the Rif, the Middle and High Atlas, at altitudes between (500) 1200 and 2000 (2350) m. In the High Atlas, it reaches its southernmost locations within the geographic range. The populations represented by the highest number of individuals are found in the Western Rif and Middle Atlas, while from the High Atlas only single, isolated individuals are known. The yew occurred preferably in forests of Cedrus atlantica, Abies maroccana, groves of Betula fontqueri, Ilex aquifolium and Prunus lusitanica and in riparian forests located in narrow gorges. Seedlings were observed only at single localities. The population of T. baccata in the Rif presented a good health condition with successful regeneration, while the population in the Middle Atlas was in a much worse state, where only 4–8 m high yews were observed, without natural regeneration. The Maxent model of predicted habitat, based on bioclimatic variables, suggests that T. baccata could occur today in much broader mountainous areas in Morocco, especially in the Rif and Middle Atlas. However, the progressive decline of this species in Morocco indicates the significant importance of other factors on yew distribution, including microsite conditions and human pressure. Taxus baccata in Morocco is in regression at most of its localities and should be treated as a vulnerable species. Measures to ensure the yew’s conservation are needed, especially at its southernmost localities in the High Atlas.
Źródło:
Dendrobiology; 2017, 78; 63-74
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trunks of multi-stem black poplars may have different genotypes – evidence from the Oder valley in Poland
Autorzy:
Zukowska, W.B.
Wojkiewicz, B.
Lewandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2078277.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Populus nigra
genets
ramets
conservation programs
microsatellites
Opis:
The black poplar (Populus nigra L.) is an ecologically and economically important tree species, characteristic for floodplain forests in Europe. It is now considered to be endangered in many European countries due to the loss of its natural habitat caused by the development of river engineering and intensive land use management of riverside areas. Multi-stem specimens can be found occasionally in natural black poplar populations. The percentage of such individuals is low, although in some stands it may be over a doz- en percent. The origin of multi-stem trees may be different. As a consequence, trunks being part of such a tree can have the same or different genotypes. The study aimed to find out whether all trunks of multi-stem black poplars are ramets of the same genet or if their genotypes are different, in which case they increase the gene pool of the population. We used 13 microsatellite nuclear markers to analyze the genotypes of 83 trunks belonging to 34 multi-stem black poplar trees from five natural populations from the Oder river valley in Poland. We also performed the sibship analysis of all trunks. The results showed that the trunks being part of the particular individual had distinct genotypes in five trees (14.7%). This indicates that they were formed as a result of the fusion of two genetically different individuals. The sibship analysis revealed that one multi-stem tree was represented by full-sibs. In the remaining four trees the fused trunks were not related. Nevertheless, we found three pairs of half-sibs between different trees that were distant from each other. The majority of the multi-stem trees we examined developed most probably due to the damage to the apical meristem of the main shoot of a single-stem tree. Nevertheless, some of them were indeed formed from two distinct individuals. Therefore, if a particular population consists of a small number of individuals, we recommend to study the genotypic homogeneity of each multi-stem tree.
Źródło:
Dendrobiology; 2021, 86; 1-7
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic status of Polish larch (Larix decidua subsp. polonica (Racib. Domin)) from Chełmowa Mountain: implications for gene conservation
Autorzy:
Litkowiec, M.
Lewandowski, A.
Burczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2078281.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
European larch
genetic diversity
microsatellites
spatial genetic structure
Opis:
The Polish larch (Larix decidua subsp. polonica (Racib. Domin), a subspecies of European larch, is one of the most valuable forest-forming trees in Poland. It was first discovered on the Chełmowa Mountain where Natural Reserve has been established to protect this subspecies. Currently, this unique population is at risk of extinction. Nonetheless, the knowledge on the genetic diversity of this population and surround- ing larch forests is insufficient to undertake actions aimed at conservation of genetic resources. In this study, we examined the level of genetic diversity and differentiation of four subpopulations of Polish larch from Nature Reserve on the Chełmowa Mountain and surrounding areas. We used eleven nuclear microsatellite markers (SSRs) combined in two multiplex PCR reactions. In total, 344 individuals of Polish larch were genotyped and subjected to further population genetic analyses. We found the high level of genetic diversity (average: He = 0.752, Ho = 0.720) and low levels of genetic differentiation (average: Fst = 0.022). The effective population size was large and homogeneous across subpopulations (mean Ne=90.7), and we found no sign of inbreeding. The spatial genetic structure was detected in two older subpopulations but not in the younger one, suggesting its artificial origin. The old larch subpopulations were genetically homogeneous and they were related to the ancestral group of Polish lowland populations. The old larch core populations growing on Chełmowa Mountain are relatively homogeneous and they well represent the ancestral genetic group of Polish lowland larch populations. However, they still exhibit rela- tively high genetic diversity and sufficiently large effective population sizes assuring their adaptive potential for a long-term existence. Surrounding larch populations are even more genetically diverse but this might be the effect of an admixture of seed sources from various populations from a wider area of Central Europe. We recommend that specific conservation efforts should be undertaken to promote natural regeneration of the core larch populations, even supplemented by the planting of seedlings derived from the oldest larch trees. Other management actions should focus on limiting external gene flow to this unique population of Polish larch.
Źródło:
Dendrobiology; 2018, 80; 101-111
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Lihtuanian Scots pine trees according to breeding categories and their seed production in seed stands
Autorzy:
Gabrilavicius, R
Powiązania:
https://bibliotekanauki.pl/articles/41345.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Scotch pine
seed stand
gene conservation
seed collection
tree
seed bearing
Lithuania
distribution
seed
Opis:
In addition to other traits, value of stands for breeding can be evaluated according to the number of plus trees and productive trees. According to this property, stands with the highest value for breeding are located in eastern Lithuania. Trees start to differentiate into breeding categories at the juvenile stage: in Scots pine stands on Pinetum myrtillosum sites, at the age of 6to 8 years and in Scots pine stands on Pinetum vacciniosum sites, at age of 10 to 12 years. According to radial increment, the trees start to differentiate into selection categories of productive, medium and minus trees, which often remain in these categories until mature age. The following four types of radial increment of trees were distinguished: (1) fast growth at the juvenile stage, followed by a gradual decrease, (2) fast growth at the juvenile stage, followed by a stable growth from age 20 to 30 years, (3) slow growth at the juvenile stage, followed gradual increase, (4) unstable growth all the time. In Lithuania, abundant seed yield used to occur in three to four year intervals. Populations with abundant flowering may produce approximately 10 kg of seeds (filled and empty) per ha, while the populations with weak flowering - 1 to 2 kg per ha. In mature Scots pine stands of stocking level ca 0.7, 6to 8% of the seeds are produced by plus trees, 24% by productive trees, 55 to 60% by trees of medium productivity and 10% by minus trees. Being suppressed, minus trees produce 2% of the seeds only.
Źródło:
Dendrobiology; 2002, 47 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of wild Thymus capitatus (Lamiaceae) in Tunisia using molecular markers
Autorzy:
Ben El Hadj Ali, I.
Guetat, A.
Boussaid, M.
Powiązania:
https://bibliotekanauki.pl/articles/41663.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
genetic diversity
wild plant
Thymus capitatus
Lamiaceae
Tunisia
molecular marker
habitat fragmentation
conservation strategy
genetic structure
Opis:
In Tunisia, Thymus capitatus L. populations are severely destroyed due to deforestation and over-collecting. The species occurs in small scattered populations decreasing progressively in size. Yet, no conservation or improvement programs are attempted to preserve and promote the potential value of this resource. In this work, we assessed the genetic diversity of nine Tunisian populations of Thymus capitatus L. from different bioclimates, using 103 polymorphic randomly amplified polymorphic DNA (RAPD) loci. The analysis of the genetic variation within and among populations is primordial to elaborate conservation and improvement programs. The species showed a low diversity within populations (0.276
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategy for long-term breeding of Picea abies in Lithuania: short overview
Autorzy:
Danusevicius, D
Powiązania:
https://bibliotekanauki.pl/articles/41309.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
international conference
Europe
forest ecosystem
plant breeding
tree
Norway spruce
Picea abies
long-term breeding
Lithuania
breeding strategy
future strategy
breeding programme
gene conservation
Opis:
This paper presents the newly suggested long-term breeding strategy for Norway spruce in Lithuania to share with the optimisation approach, which may be useful in synchronising the long-term breeding and gene conservation plans in neighbouring regions. The breeding programme in Lithuania is at a stage where the long-term plans need to be developed. Our strategy is to proceed with a closed-nucleus breeding population which is structured into subpopulations according to adaptation zones (4-5 subpopulations). The size of each subpopulation is 50 unrelated and progeny-tested individuals. The breeding cycle consists of double- pair mating and a balanced within-family selection forward. The candidates will be clone-tested. Advanced genotypes will be selected into an advanced nucleus; an isolated foreign breeding population is planned. Positive assortative mating is used for deployment. An experimental "shuttle-breeding" strategy may be tested: selection with avery high intensity, controlled crosses, nursery tests for vigour and growth rhythm, cloning by hedges into short-rotation clonal plantations.
Źródło:
Dendrobiology; 2009, 61 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
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