落叶松杂交子代生长表现及遗传增益研究

Analysis on Growth and Genetic Gain of Progenies from Larch Hybrids

通过对12a生落叶松杂交子代测定林10个家系的树高、胸径及立木材积进行分析,结果表明3个性状基本呈正态分布,且家系间及家系内均存在较丰富变异,生长最好家系与最差家系的比值由大至小顺序为材积、胸径和树高。3个性状的遗传力均较高,属强度遗传,其遗传增益随树木年龄增加而下降。筛选出的5个家系(日3×兴2、兴7×日77-2、日5×长77-3、日5×长78-3、日3×兴9)表现优良,其中,日3×兴2的树高生长遗传力尤为突出,其遗传增益较3个对照(当地生产用种、小北湖种源、长白落叶松种子园混合)分别提高33.6%、26.2%、和20.9%。

The height, diameter and volume growth of 10 families from a 12-year-old progeny test plantation of larch hybrid were investigated. All 3 growth traits presented normal distributions, and abundance variations were found among families and also within families. The results of higher heritability of height, diameter and volume indicated that strong genetic control for these 3 growth traits were existed. A trend was detected that the genetic gain of growth declined as tree age increased. Finally,5 superior familiesh kaempferi 3 × L. grnelini 2 ,L. gmelini 7 × L. kaempferi 77-2 ,L. kaempferi 5 × L. olgensis 77-3,l. kaempferi 5 × L. olgensis 78-3, L. kaempferi 3 × L. gmelini 9, were selected. Compared to 3 CK of native provenance, Xian Beihu provenance and L. olgensis, the genetic gain of height growth of L. kaempferi 3 × L. gmelini 2 could increase in 33.6% ,26.2% and 20.9% ,respectively.