小麦种子活力性状的遗传变异和相关研究(英文)  

Genetic difference and interrelationship among seed vigor traits in wheat

作　　者：马守才[1] 张改生[1] 王军卫[1] 卢碧霞[1] 李宏茹[2] 

机构地区：[1]西北农林科技大学陕西省作物杂种优势研究与利用重点实验室,陕西杨陵712100 [2]青海省大通县农业技术推广中心,青海大通810100

出　　处：《西北植物学报》2004年第9期1674-1679,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(39970454);杨凌示范区专项基金资助项目

摘　　要：本研究利用12个普通小麦品种对10个种子活力性状的遗传变异和相关研究,表明除正常幼苗百分率外,其余种子活力性状在品种间均存在显著的差异。种子贮藏物质转换效率、电导率两个性状间及与其它性状均无显著的遗传相关,因此对他们的选择不会影响到其它性状。通径分析表明幼苗干重主要取决于种子贮藏物质转换效率、种子贮藏物质利用速率;发芽指数主要由平均发芽时间决定。电导率、发芽势、幼苗干重、种子干重、发芽指数、种子贮藏物质消耗比率6个性状表现中到高的遗传力、遗传变异系数和相对遗传进展,指明通过遗传育种手段改良这些性状是可能的。This study was conducted to examine the interrelationship of 10 seed vigor traits in 12 wheat genotypes through variance,co-variance and path coefficient analysis,to determine broad-sense heritability,and to estimate genetic advance under selection.The genotypes showed significant difference for all traits,except for percentage of normal seedling.Genetic correlation between conversion efficiency of seed reserve,electrical conductivity with other traits were not significant,showed that selection for any of them might be possible without hampering any other traits.However path coefficient analysis indicated that conversion efficiency of seed reserve,seed reserve utilization ratio have strong direct effect in affecting seedling weight,and that mean germination time has significantly negatively correlated in affecting GI.Moderate to high estimates of broad-sense heritability,genetic coefficient of variation and expected genetic advance were obtained for electrical conductivity,germination index,mean germination time,seed dry weigh,seedling dry weigh,seed reserve depletion ratio indicating the possibility for improving these traits.

关 键 词：小麦 种子活力 遗传变异 遗传相关 

分 类 号：Q945.35[生物学—植物学] S512[农业科学—作物学]