摘要
利用电解质渗漏方法对5个小麦品种(系)(325-35,NPFP,881,中国春,SieteCerros 66)的8～12种同核异质系进行了耐热性测定,以研究异源细胞质对小麦耐热性的影响。结果表明:(1)所有5个品种(系)的同核异质系耐热性均表现显著的遗传变异,一些异质系耐热性比核亲本明显增加,另一些异质系耐热性比核亲本明显下降;(2)同一种异源细胞质在不同核亲本遗传背景下对耐热性影响不同,如节节麦细胞质在352-35和 Siete Cerros 66核背景下降低耐热性,在 NPFP 和中国春核背景下增加耐热性,在881核背景下耐热性无明显变化,说明耐热性表现存在明显的核质互作;(3)个别异源细胞质(如高大山羊草和粗厚山羊草)在多数核背景下均增加耐热性,在小麦耐热性遗传改良中具有潜在应用价值。
Heat tolerance of five spring wheat cultivars(lines),i.e.,352-35,NPFP,881,Chinese Spring(CS)and Siete Cerrros 66,and their fifty alloplasmic lines were tested using electrolyte leakage method to investigate genetic effects of alien cytoplasms of Triticum and Aegilops on heat tolerance in com- mon wheat.Results indicated that:①significant variations in heat tolerance exist between nucleus donor genotypes and their alloplasmic lines,and between alloplasmic lines of same nucleus genotype for all of the five cultivars.Alloplasmic lines can be more heat tolerant or susceptible to high temperature stress than nucleus donor genotypes,suggesting that alien cytoplasms affect heat tolerance significantly,and there are genetic variations of cytoplasms among species of Triticum and Aegilops in heat tolerance;②Effects of one species cytoplasm on heat tolerance is quite dependent on the nucleus genotypes,which suggeted that there exists interaction between alien cytoplasms and nucleus genotype;③Cytoplasms of A.longissima and A. crassa heat tolerance in most of the nucleus genotype backgrounds.It is concluded that genetic variability exists among the alien cytoplasms in heat tolerance,and can be useful in genetic improvement of the trait in wheat.
基金
霍英东教育基金会资助项目
关键词
耐热性
异源细胞质
小麦
异质系
heat tolerance
alien cytoplasmic effects
wheat
alloplasmic lines
