灰楸不同流域种质变异与多样性研究

Blastation and Diversities of Catalpa Fargesii Genetic Resources among Basins

通过对灰楸4个流域的137份种质资源的1年生嫁接苗10个表型性状的变异与多样性分析,结果表明:10个表型性状在流域间、流域内均达极显著差异。流域间10个表型性状平均变异系数、遗传变异系数分别为15.81%、29.08%;遗传方差分量都约在70%及以上,说明10个表型性状的差异主要为遗传因素,从流域内变异看,叶部指标和皮孔数在泾河流域和汾河流域变异较大,生长指标和比叶重、含水量、在渭河流域和嘉陵江流域变异较大。总的Shannon-Weaver指数为6.995,趋势是嘉陵江流域>泾河流域>汾河流域>渭河流域。基于表型性状的聚类分析把4个流域的种质在遗传距离为3.65处分为3类。第1类包含来自渭河流域的28份种质和嘉陵江流域的46份种质,第2类是汾河流域的24份种质,第3类是来自泾河流域的39份种质,叶长、叶宽、叶柄长、叶面积、生长量5个表型性状变异随海拔的升高具有一定的连续性。

The variation and diversity of ten phenotypic traits of 137 germplasm Catalpa fargesii Bur.collected from 4 basins were analyzed.The result showed that the 10 phenotypic exhibited significant differences between and within the basins.The mean variation coefficient and genetic variation coefficient of the ten phenotypic traits between the basins were 15.81% and 29.08%.Genetic variance components were more than 70%,which mean the genetic factors led the difference of the 10 phenotypic traits.The variation of the leaves traits and skin aperture counts were higher within the Jing basin and Fen basin.The variation of the growth index,specific leaf weight and moisture content were higher within the Weihe basin and Jialing River.basin The total Shannon-Weaver index was 6.995 and its trend was showed as follows：the Jialing River Basin Jing River Basin Fen River Basin Weihe Basin.Based on the phenotypic traits,The germplasm of four drainage basins were clusted into 3 groups at 3.65 genetic distance.The first group included 28 germplasm from Weihe River basin and 46 germplasm from Jialing River basin,the second group included 24 germplasm from Fenhe basin,the third group included 39 germplasm from Jinghe basin.The variation of leaf length,leaf width,petiole length,leaf area and biomass presented a elevation-dependent distribution.