In order to efficiently introduce the genes of Aegilops triuncialisL. for resistance to powdery mildew into Triticum aestivum L., it is of importance to understand the genetic mechanism of their F 1 hybrid. It was shown that the bivalent frequency was higher than that of the theoretical value. It resulted from the combination of the wheat inhibitors of 5B Ph gene which located respectively on C and U genome of Aegilops triuncialis L. The results of chromosome in situ hybridization with the C genome-specific repetitive sequence, pAeca212, as the probe further indicated that some chromosomes of the C genome of Ae. caudata L. paired with the chromosomes of the other genomes.
普通小麦与钩刺山羊草杂交F1的农艺性状及细胞遗传学的观察
孔秀英 董玉琛 周荣华贾继增
（中国农业科学院作物种质资源研究所，农业部作物品种资源与生物技术重点开放实验室，北京100081）
摘要：为有效地利用钩刺山羊草 (Aegilopstriuncialis L .)的抗白粉病基因对小麦 (Triticumaestivum L .)进行遗传改良 ,了解两者杂交后杂种F1的遗传机制是十分必要的。对F1杂种的研究表明 ,二价体频率高于理论值 ,是分别存在于钩刺山羊草C和U基因组中的小麦 5B染色体上Ph基因抑制因子联合作用的结果。以尾状山羊草 (AegilopscaudataL .)C基因组特异重复序列pAeca2 1 2为探针所进行的原位杂交结果进一步表明在联会的二价体中 ,C基因组染色体与其他基因组染色体之间发生了联会。
关键词： 普通小麦；钩刺山羊草；原位杂交
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