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Options for converting a clone trial of Eucalyptus camaldulensis into a clonal seed orchard considering gain,fertility and effective clone number

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Journal of Forestry Research 2016年第1期27卷 51-57页

作者： R.Kamalakannan M.Varghese P.G.Suraj T.Arutselvan ITC Life Sciences and Technology Centre (LSTC) Peenya Industrial Area Phase I

We evaluated a clone trial comprised of 20 ramets each of 40 Eucalyptus camaldulensis clones for growth and fertility at 4 years of age. The clones differed significantly in growth with 65-100 % survival in 38 clones while two clones had low survival （40 and 10 %）. Fecundity was high and fertility variation low, as indicated by the sibling coefficient value （ψ = 1.4） with 55 % of clones contributing 80 % of the fruits. Thinning strategies were considered to convert the clone trial to a clonal seed orchard and enhance both gain and diversity in seed crop. When clones were selected based on growth without con- sidering fertility, truncation selection （to retain clones with higher DBH than the trial mean value） would give 8 % gain, but 59 % reduction in effective population size （Ne）. Gain and predicted diversity （Ne） was highest when ramets were selected in linear proportion to the breeding value of each clone. Mass selection with the same intercept （for DBH） as truncation selection would give a moderate 3 % gain, but over two times higher predicted Ne than trunca- tion selection. When fertility of retained trees was con- sidered after thinning, mass selection would yield 52 % effective contribution from the orchard trees compared to only 30 % contribution from truncation selection and linear thinning. Higher representation of superior clones in linear thinning and mass selection would lead to greater fertilityvariation and over 30 % reduction in effective clone number （Nc） from that predicted （Ne, assuming equal fer- tility among ramets） before thinning.

关键词： seed orchard Fertility variation Geneticgain Diversity Thinning Eucalyptus

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维普期刊数据库

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Family Outcrossing Rates of Pinus caribaea Morelet var. caribaea in seed orchard and Natural Populations

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Chinese Forestry Science and Technology 2002年第1期1卷 46-56页

作者： ZHENG YongqiResearch Institute of Forestry. Chinese Academy of Forestry. Beijing 100091

Family outcrossing rates of Pinus caribaea var. caribaea populations that differed in origin and management were estimated by using isozyme markers. The family outcrossing rates were estimated by (1)fixing the probability of pollen gene frequency (p); (2) allowing pollen gene frequency to vary among families. The estimates of family outcrossing rates for all the populations varied widely among families (clones of the seed orchard), ranging from 0.39 to 2.0. The average family outcrossing rates of both m...

关键词： Pinus caribaea var. caribaea Family outcrossing rate mating system isozyme seed orchard

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Does ash dieback affect the reproductive ecology of Fraxinus excelsior L.?

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Journal of Forestry Research 2024年第2期35卷 54-69页

作者： Anna‑Katharina Eisen Lisa Buchner Barbara Fussi Susanne Jochner‑Oette Physical Geography/Landscape Ecology and Sustainable Ecosystem Development Catholic University of Eichstätt-Ingolstadt85072 EichstättGermany Bavarian Office for Forest Genetics(AWG) 83317 TeisendorfGermany

Forest tree species reproduction is a key factor in maintaining the genetic diversity of future generations and the stability of forest *** ongoing ash dieback disease could affect the reproductive ecology of Fraxinus excelsior *** have a major impact on the quantity and quality of pollen and *** this study,we investigated pollen production and viability of pollen and seeds of ash trees with different health status from 2018 to *** were collected from 105 trees(pollen production),pollen from 125 trees(pollen viability),and seeds from 53 trees(seed quality)in two seed orchards and in one floodplain forest in southern *** all parameters were examined at every site every *** average pollen production per tree was estimated at 471.2±647.9 billion pollen *** addition,we found that a high number of inflorescences did not equate to high pollen production per *** production of healthy and diseased trees did not differ significantly,although only 47%of severely diseased male trees(vs.72%for healthy trees)produced *** regards to pollen viability,the TTC test showed an average viability of 73%±17%.Overall,there was a slight tendency for diseased trees to have less viable ***,a significant difference could only be calculated for trees in the floodplain *** percentage of germinable seeds in 2018 was 38%in the floodplain forest and 57%in one of the seed *** percentage of viable seeds(TTC test)ranged from 17 to 22%in the orchards in ***-viable seeds were usually heavily infested by *** general,seed quality was not significantly different between healthy and diseased *** results indicate that ash dieback affects flower formation and pollen viability but not pollen production or seed ***,the fact that hardly any flowering was observed,especially for trees that were seriously affected,suggests a negative effect of ash dieback on reproductive per

关键词： Common ash seed orchard Floodplain forest Pollen production Viability TTC test seed stratification Phenology

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维普期刊数据库

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Research on Fertilization Techniques and Their Effect in Eight Cunninghamia lanceolata seed Or chard

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Forest Ecosystems 1994年第2期 92-102页

作者： Chi Jian Wu Dehuo Xu Qingqi Wu Haozao The Subtropical Forestry Research Institute,CAF Fu YangZhe Jiang,China 311400

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关键词： seed orchard fertilization technique

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Genetic divergence for growth and wood parameters in different clones of Dalbergia sissoo Roxb

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Journal of Forestry Research 2012年第2期23卷 285-288页

作者： Kumar A Bhatt A Ravichandran S Pande PK Dobhal S Forest Research Institute (Indian Council of Forestry Research and Education) Dehradun 248 195 Uttarakhand India Directorate of Rice Research Rajendra Nagar Hyderabad-500030 Andhra Pradesh India

The wood analysis for different parameters was carried out in a clonal seed orchard ofDalbergia sissoo Roxb. established during 1997 at Hoshiarpur, Punjab, India. Twelve clones with higher index value were subjected to Euclidean Cluster Analysis based on wood and growth parameters to group into seven clusters. Cluster I and II contained four and three clones, respectively, and remaining clusters bad just one clone each. Clone originated from Barielly, Uttar Pradesh of cluster VII was found to be the most divergent clone. Cluster II with three clones main- tained greater inter cluster distance with other clusters. The divergence analysis has confirmed that the clones planted in the clonal seed orchard are sufficiently divergent and seed harvested from the orchard would maintain high diversity.

关键词： Dalbergia sissoo Roxb. seed orchard wood and growthtraits genetic divergence hybridization

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维普期刊数据库

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Research progress on genetic improvement of Betula platyphylla Suk.

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Frontiers of Agricultural Science and Engineering 2017年第4期4卷 391-401页

作者： Chuanping YANG State Key Laboratory of Tree Genetics and Breeding Northeast Forestry University

Betula platyphylla Suk. is one of the most widely distributed species of Betula, the fourth most valuable timber species in north-eastern China and also a common tree species for landscaping. Over the past 30 years, effective progress has been made in genetic improvement and molecular breeding of B. *** has been extensive research on breeding techniques,including the collection and conservation of B. platyphylla germplasm resources, provenance trials, intensive breeding techniques, crossbreeding and asexual propagation techniques, ploidy breeding and mutation breeding technology, genome sequencing, gene cloning, transgenic and molecular mechanisms of wood formation. A Betula germplasm resource collection has been established by collecting different provenances, and full-sib and half-sib families. In addition, the geographic variation patterns of B. platyphylla provenances have been revealed, and the provenance division and superior provenance selections made. B. platyphylla flowering and seeding have been improved through intensive breeding techniques. Interspecific hybridization, intraspecific hybridization and parallel crosses were made using fine parents, and B. platyphylla intensive seed orchards have been established. Systems of asexual propagation, including cuttings,grafting and tissue culture have been established. A B. platyphylla tetraploid was successfully constructed and a B. platyphylla triploid seed orchard established. The growth, wood property and resistance genes of B. platyphylla have been cloned. An efficient B. platyphylla transgenic system mediated by Agrobacterium tumefaciens was established, and genes encoding B. platyphylla insect resistance, drought resistance and salt tolerance, lignin synthesis, flowering, hormone transport and balance obtained. B. platyphylla molecular markers were developed and the high density B. platyphylla genetic map constructed. All this researchhas provided a model and data for the foundation of fores

关键词： Betula platyphylla genetic improvement molecular breeding seed orchard

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