辛晓平-不同水分条件下春小麦种群中个体大小不整齐性及遗传学分析.pdfVIP

植物生态学报　1998, 　22 (2) 157～ 163 A cta Phytoecolog ica S in ica 不同水分条件下春小麦种群中个体大小 不整齐性及遗传学分析 辛晓平　王刚　赵松岭 (兰州大学干旱农业生态国家重点实验室, 兰州　730000) 摘　要　种群内个体大小不整齐性是种群数量结构的主要指标。本文研究了不同水分条件下, 3个品种 春小麦种群个体大小不整齐性的建立及变化规律。对春小麦种群不整齐性的遗传学分析表明: 遗传结构 与随机环境修饰对种群数量结构形成的相对重要性, 因水分条件不同而异。种群不整齐性在自然选择中 的作用可用下列简单模型表示: = × 2 GS 0 S H hS H GS : 自然选择强度; S H : 大小不整齐性; h 2 : 不整齐性的遗传力。 0 S H 关键词　水分条件　春小麦种群　大小不整齐性　自然选择　进化 SIZE H IERARCHY AND ITS GENET IC ANALY SIS IN SPR ING W HEAT POPULAT ION UND ER D IFFERENT W ATER COND IT IONS X in X iaop ing, W ang Gang and Zhao Songling (K ey L aboratory of A rid A g roecology , L anz hou U niversity , L anz hou 　730000) Abstract　Q uantitative characteristics of population structure such as size h ierarchy and pop 2 2 ulation h ierarchy that result from size dependent rep roduction of th ree varieties of sp ring w heat under different w ater conditions w ere studied. Genetic analysis of size h ierarchy of the populations under different w ater conditions indicates that relative effects of genetic structure and random environm ent on the quantitative population structure varied among the w ater sup2 p lies. Intensive competition fo r w ater companied w ith h igher heritability of size h ierarchy and quantitative population structure w as m ainly determ ined by population genetic structure and vice verse. T he intensity of natural selection had a po sitive relationsh ip w ith size h ierarchy and , . , its heritability i e = × 2 GS 0 S H hS H