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Age–age correlations and early selection for growth traits in 40 half-sib families of Larix principis-rupprechtii

查看全文 作　　者：Mingliang [1]Dong;Yingming [1]Fan;Zhihui [2]Wu;Futang [2]Lv;Jinfeng [1]Zhang 高影响力作者 机构地区：[1]Beijing Advanced Innovation Center for Tree Breeding by Molecular Design,National Engineering Laboratory for Tree Breeding,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants,Ministry of Education,The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of State Forestry Administration,College of Biological Science and Biotechnology,Beijing Forestry University,Beijing 100083,People’s Republic of China;[2]Jingle County Forestry Bureau,Jingle 035100,Shanxi Province,People’s Republic of China高影响力机构 出　　处：《Journal of Forestry Research》索引2019年第30卷第6期,共7页高影响力期刊 基　　金：supported by National Key R&D Program of China(2017YFD0600404-1);Medium and Long Scientific Research Project for Young Teachers in Beijing Forestry University(2015ZCQ-SW-02);the Project of National Natural Science Foundation of China(31370658);Program for Changjiang Scholars and Innovative Research Team in University(IRT13047);the Project of Beijing Gardening and Greening Bureau(CEG-2016-01) 摘　　要：Larix principis-rupprechtii Mayr is a dominant species in coniferous forests of North China.However,early selection of L.principis-rupprechtii for growth traits is poorly characterised.To explore the optimal selection age for this species,heights(HT)and diameters at breast(DBH)of 40 half-sib families were measured at ages 3,12,22,and 28 years in a progeny test population established in the town of Kangjiahui,Shanxi Province.Age trends in heritability,age–age genetic correlations,and early selection efficiency for height and DBH were analysed.The individual heritability of these growth traits varied over time,and maximized at different ages(0.55 at age 12 for HT and 0.48 at age 28 for DBH).The age–age genetic correlations were always positive,and the majority were high(0.790–0.953)between the juvenile and mature ages for HT and DBH.For the same pairs of measurements,HT demonstrated higher age–age genetic correlations than DBH,and both age–age genetic correlation data sets were described well by the linear relationship with the logarithm of the age ratio(r2[0.90).The regression slope for DBH was lower than that for HT.Based on the early selection efficiency estimates,the optimal selection age could be as early as age 6 for DBH and 8–9 years for HT.The results of this study provide information that can be used to assist early selection practices in L.principis-rupprechtii improvement programs in Shanxi Province. 关 键 词：Age–age CORRELATIONS Early SELECTION HERITABILITY LARIX principis-rupprechtii SELECTION efficiency
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