摘要： 利用20%PEG-6000作为渗透介质进行室内模拟干旱胁迫,测定小麦发芽率、发芽势、胚芽鞘长、主胚根长;采用模糊隶属函数与抗旱系数相结合的方法对品种萌发期的抗旱性进行综合评价,并利用灰色关联分析了各个形态指标与抗旱性的关系.结果表明,干旱胁迫下,各品种的发芽率、发芽势、胚芽鞘长、主胚根长均比对照不同程度地降低或缩短,而且不同品种间差异达显著或极显著水平;萌发期各品种抗旱性表现依次为:白和尚头＞晋麦47＞竹杆青＞四月黄＞小红麦＞灯笼红＞红皮冬麦＞忻县冬麦＞中麦9号.应用灰色关联分析的方法研究萌发期发芽势、发芽率、胚芽鞘长和主胚根长的抗旱系数4个性状指标与抗旱性之间的灰色关联度,结果表明,关联度依次为:发芽率＞主根胚长＞胚芽鞘长＞发芽势,表明发芽率与萌发期抗旱性关系最为密切,其可作为萌发期抗旱性鉴定指标.

关键词: 小麦地方品种, 萌发期, 抗旱性, 渗透胁迫

Abstract: 20%PEG-6000 was used to induce water stress in laboratory,the germinating potential,germination rate,coleoptile and root lengths were measured.Then drought resistance of Shanxi wheat landraces at sprouting stage were analyzed by fuzzy subordinate function analysis combined drought resistance coefficient.Finally,the relationship between each morphological index and drought resistance was established using grey correlative degree analysis.The results indicated that the germinating potential,germination rate,coleoptile and root length of each landrace were decreased or shortened than those of the control under drought stress,and difference among wheat landraces were significant or remarkably significant,and that drought resistance at spouting stage in different landraces were Baiheshangtou >Jinmai47>Zhuganqing > Siyuehuang>Xiaohongmai>Denglonghong >Hongpidongmai >Xinxiandongmai> Zhongmai 9 Baiheshangtou Was highly resistant to drought at sprouting stage and would be used as a good germsplasm in wheat breeding,an that degree of correlation between 4 morphological indexes and drought resistance was germination rate>root length>coleoptile length>germinating potential.hence germinating rate could be a useful morphological index of drought resistance.

Key words: Wheat landrace, Sprouting stage, Drought resistance, Osmotic stress

中图分类号: 

• S12.01