文献类型：期刊文献

英文题名：Age trends of genetic parameters, early selection and family by site interactions for growth traits in Larix kaempferi open-pollinated families

作者：Diao, Shu[1,2] Hou, Yimei[3] Xie, Yunhui[1,2] Sun, Xiaomei[1,2]

通信作者：Sun, XM[1];Sun, XM[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[3]Res Inst Forestry Sci, Jianshi Cty 445300, Hubei Province, Peoples R China

年份：2016

卷号：17

期号：1

外文期刊名：BMC GENETICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000379234000003)】；

基金：This work was supported by the Special Fund for Forest Scientific Research in the Public Welfare (201504104).

语种：英文

外文关键词：Heritability; Early selection; Family by site interactions; Growth traits

摘要：Background: Japanese larch (Larix kaempferi) as a successful exotic species has become one of the most important economic and ecological conifers in China. In order to broaden the genetic resource of Larix kaempferi, an effort was made in 1996 to introduce 128 families from seven seed orchards in Japan, with which to establish two progeny trials in climatically different environments. The experiment was aimed to determine the strategy of early selection, particularly important for long-rotated Japanese larch, and the optimal breeding program for specific environments. Result: Growth trajectories revealed different growth performances of stem height (HGT) and diameter at breast height (DBH) in two different environments, Hubei and Liaoning. In both sites, there were marked variabilities in HGT, DBH and volume (VOL) among families at each year. The trends of individual and family heritability and age-age correlations were found to follow a certain dynamic pattern. Based on these trends, the optimum selection age was determined at four years for HGT and five years for DBH in Hubei and Liaoning. Genetic gains for VOL were 34.4 and 6.04 % in Hubei and Liaoning respectively when selection ratio was 10 % at age 16. Type-B correlations were less than 0.67 and rank correlations of breeding value were less than 0.4 for HGT, DBH and VOL between the two sites, revealing that there exist pronounced family-by-site interactions for the growth traits of Larix kaempferi. Conclusions: Early selection for Larix kaempferi is an effective strategy to overcome its long rotation age. In early selection, dual growth trait selection is more effective than single one. Regionalization deployment should be considered in Larix. kaempferi breeding program based on different environmental factors.