摘要： 以Seui82×SieteCerros重组近交系为供试材料,采用电解质渗漏测定细胞膜热稳定性的方法,对耐热性获得与大田生产条件下的耐热性表现的关系进行了研究,发现供试材料幼苗相当热损伤率的变幅为390%～758%,基因型间在该性状上表现出显著的差异。在幼苗相对热损伤率和大田环境条件下耐热性表现的相关分析中,发现相对热损伤率与大棚升温及第2播期的千粒重、穗粒重热感指数呈显著的正相关,并和第2播期产量性状表现显著的负相关,和升温处理的产量性状也表现出较高的负相关。研究认为细胞膜热稳定性是一个耐热性评价的理想生理指标。

关键词: 小麦, 高温胁迫, 耐热性, 相对热损伤率

Abstract: Recombinant inbred lines(RIL) derived f rom sping wheat hybrid betw een Seri88 and Siete Cerrosw ere used to study the relationship of heat tolerance and acquired heat tolerance in wheat. The electrolyte leakagetest was conducted using seedling s exposed to 40 e hardening for 48 h to study the relationship between acquiredtolerance and performance of gemotypes grown under tw o dif ferent field environment s. Large g enet ic dif ferencein relative injury (RI% ) w ere observed among 25 genotypes,ranging f rom 39. 0% ~ 75. 8%. The correlation ofRI values with heat tolerance trait s indicated that RI average values had a significant posit ive association withheat suscept ibility index of 1 000 kernel w eight and of kernel w eight per spike,and a signif icant nagative association with yield related trait s under second sow ing date environments,which indicated that membrane thermostability(MT ) test was a useful screening method for the selection of heat tolerance genotyes of wheat.

Key words: Wheat, High temperature stress, Heat tolerance, Relat ive injury

中图分类号: 

• S512.1