水分胁迫下不同基因型小麦苗期的形态生理差异  

Morphological and physiological differences of wheat genotypes at seedling stage under water stress

作　　者：田梦雨[1,2] 李丹丹[1,2] 戴廷波[1,2] 姜东[1,2] 荆奇[1,2] 曹卫星[1,2] 

机构地区：[1]南京农业大学农业部南方作物生理生态重点开放实验室,南京210095 [2]江苏省信息农业高技术研究重点实验室,南京210095

出　　处：《应用生态学报》2010年第1期41-47,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30871481);农业部公益性行业科研专项(200803037)资助

摘　　要：以36个不同育成年代和生态区域的小麦品种为材料,研究了水分胁迫对小麦苗期生长的影响,并基于灰色关联分析评价了小麦品种苗期抗旱性的基因型差异.结果表明:小麦品种抗旱性差异显著,加权抗旱指数在0.2434～0.6580之间;17个形态生理性状中与抗旱性关联程度最大的是地上部干物质量(0.9473),最小的是叶绿素含量(0.5356).采用聚类分析将36个小麦品种分为3类,其中抗旱型8个、中间型23个、敏感型5个.3类基因型的地上部干物质量、根干物质量、植株干物质量、株高、根系氮积累量、叶面积和单株分蘖数差异显著,可作为小麦品种苗期抗旱性鉴定的直接指标.Taking thirty six wheat cultivars bred in different era and ecological regions as test materials,their seedlings growth under water stress was investigated,and their drought resistance was evaluated by gray correlation grade analysis.Significant difference was observed in the drought resistance among the cultivars.The weighted drought resistance index ranged from 0.6580 to 0.2434.Among the test seventeen morphological and physiological traits,shoot dry mass had the greatest correlation degree （0.9473） with drought resistance,while SPAD had the smallest one （0.5356）.The test cultivars were clustered into three groups,among which,eight cultivars belonged to strong drought resistance group,twenty three cultivars belonged to medium drought resistance group,and five cultivars belonged to drought-sensitive group.The shoot dry mass,root dry mass,plant dry mass,plant height,root nitrogen accumulation,leaf area,and tiller number per plant differed significantly among the three groups,which could be used for evaluating the drought resistance of wheat cultivars at seedling stage.

关 键 词：小麦 苗期 抗旱性 基因型差异 

分 类 号：S512.1[农业科学—作物学]