模拟干旱胁迫下冬小麦胚芽鞘长度变化及与抗旱性的关系研究  

Variation of coleoptile length in winter wheat varieties under PEG simulated drought stress and its association with their drought tolerance

作　　者：关周博[1] 王士强[1] 陈亮[1] 唐娜[1] 胡银岗[1,2,3] 

机构地区：[1]西北农林科技大学农学院,陕西杨凌712100 [2]国家小麦改良中心杨凌分中心,陕西杨凌712100 [3]陕西省农业分子生物学重点实验室,陕西杨凌712100

出　　处：《干旱地区农业研究》2009年第4期125-130,共6页Agricultural Research in the Arid Areas

基　　金：863重点项目子课题(2006AA100201;2006AA100223);科技部973计划前期项目(2006CB708208);澳大利亚ACIAR项目(CIM/2005/111);高等学校学科创新引智计划项目(111-2-16)

摘　　要：以6个抗旱性不同的冬小麦品种(系)为材料,通过不同浓度的PEG-6000渗透溶液模拟干旱胁迫处理,研究了小麦苗期的胚芽鞘长度、苗高、主胚根长等性状,并与其在大田及防雨棚控水条件下的产量构成和抗旱性的关系进行分析。结果表明,在不同浓度的PEG-6000渗透溶液干旱胁迫处理下,小麦苗期胚芽鞘长度在品种间差异显著;产量的抗旱指数与苗期不同干旱胁迫处理下的胚芽鞘长度的相关性分析表明,小麦的胚芽鞘长度与其抗旱指数呈极显著正相关(相关系数为0.9600),抗旱性强的品种胚芽鞘较长,抗旱性弱的品种胚芽鞘较短。在不同程度的干旱胁迫处理下,各品种的胚芽鞘长度变化趋势大致相同,因此利用胚芽鞘长度可以在早期对小麦的抗旱性进行鉴选。6 winter wheat varieties （or lines） were used as materials, their coleoptile length, seedling length and main radicle length of wheat seedlings were investigated under different concentrations of PEG - 6000 osmotic solution simulated drought stress, and their relations with the yield components and drought tolerance under raided and rainout shelters were further analyzed. Under different concentrations PEG - 6000 osmotic solution simulated drought stress, significant differences were observed among different wheat varieties. The correlation analysis on their coleoptile length in seedlings under different treatments with their yield drought tolerance index revealed significant and positive association with correlation coefficient of 0.9600. The longer the coleoptile length of the variety is, the higher the drought tolerance index is. Coleoptile length were observed in different varieties, and the differences among varieties were consistent under different simulated drought stresses, therefore, eoleoptile length could be used in the evaluation of drought in wheat at the early stage.

关 键 词：小麦 干旱胁迫 胚芽鞘长度 抗旱指数 抗旱性 

分 类 号：S152.11[农业科学—土壤学]