大豆种质资源抗旱性综合评价

摘要

By adopting the combination of drought resistance index and membership function method ,two treatments (drought stress and normal irrigation) were set in Dunhuang city where annual rainfall is less than 40mm .Seven drought relevant agronomic traits ,including plant height ,branch number ,pods per plant ,grains per plant ,seed number per plant ,seed weight per plant ,100 seed weight and biomass ,were analyzed by a combination of drought index and mem-bership function methods .The responses of the investigated agronomic traits to drought stress varied at different levels . The responses of branch number and 100 seed weight were slow ,whereas those of biomass and seed weight per plant were fast .According to the clustering result of drought resistance value ( D value ) ,12 drought-resistant soybean germplasms (Spry ,Jindou 21 ,Xiataizimoshidou ,etc .) were selected from 123 soybean germplasms tested .It seemed to be feasible using a combination of drought index and membership function methods to analyze multiple agronomic traits ,which could effectively evaluate drought resistance of soybean germplasms .Compared to single index ,this comprehensive evaluation was stable and useful in revealing the relationship between indexes and drought resistance .%采用抗旱指数与隶属函数相结合的方法，在年降雨量不足40 mm的敦煌市，设干旱胁迫和正常灌水2个处理，考察了12份地方、73份国内育成和38份国外引进共计123份大豆种质与抗旱性相关的株高、分枝数、单株荚数、单株粒数、单株粒重、百粒重、生物产量等7个性状。结果表明：被考察的农艺性状对干旱胁迫的反应程度各异，其中分枝数和百粒重反应迟钝，单株生物量和单株粒重反应敏感；根据抗旱性量度值（D值）的聚类结果，供试的123份材料中筛选出Spry、晋豆21、下台子磨石豆等12份抗旱资源。利用多个农艺性状，采用抗旱指数与隶属函数相结合的方法，综合评估大豆种质的抗旱性是可行的，不仅可以避免单一指标的片面性和不稳定性，而且可以较好地揭示指标与抗旱性的关系。