梭梭种源间苗期性状的遗传变异及相关性分析

利用田间种源实验,对分布在中国5个自然分布区的5个种源梭梭〔Haloxylon ammodenaron(C.A.Mey.)Bge.〕苗期的10个生长性状进行了观测分析。结果表明,不同种源梭梭的苗期生长性状差异显著,差异较大的性状有新生枝长度、生物量、主根数量和一级分枝数。5个种源中,内蒙古磴口种源梭梭幼苗的上述性状表现最好,其后依次为甘肃武威、内蒙古乌拉特后旗、内蒙古额济纳旗和青海德令哈。相关分析结果表明,苗期生物量与根部生长性状遗传力的相关程度高于苗期茎部生长性状,表型性状的相关程度高于遗传力。梭梭苗期种源选择的首选因子为苗高、地上部鲜质量和地径性状,辅助因子为一级分枝数、主根数量和同化枝粗度。

Genetic variation of some traits of Haloxylon ammodenaron seedlings from different provenances and their correlation analysis

Ten growth traits of Haloxylon ammodenaron(C.A.Mey.) Bge.seedlings from five provenances introduced from five natural distribution zones in China were measured through field experiments.The results showed that there were significant differences among all growth traits,in which differences of new-shoot length,biomass,main root number and branch number were distinct.Among the five provenances,the best provenance site was Dengkou of Inner Mongolia,and the following sites were Wuwei of Gansu,Urad Houqi of Inner Mongolia,Ejin Qi of Inner Mongolia and Delingha of Qinghai.The results of correlation analysis showed that the correlation of heritability between biomass and root growth traits were greater than that between biomass and stem growth traits,and correlations among phenotype traits were higher than those among heritability.It is concluded that these traits including seedling height,fresh weight of above-ground part and collar diameter should be considered as preference factors,and the branch number,main root number and assimilation shoot diameter as assistant factors for selecting seedlings.