A comparison of cytoplasmic and chemically-induced male sterility systems for hybrid seed production in wheat (Triticum aestivum L.)
A comparison of cytoplasmic and chemically-induced male sterility systems for hybrid seed production in wheat (Triticum aestivum L.)
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DOI：
10.1023/b:euph.0000013320.28114.c6
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发表时间：
2004-01-01
期刊：
影响因子：
1.9
通讯作者：
Bains, NS
中科院分区：
文献类型：
--
作者：
Adugna, A;Nanda, GS;Bains, NS
对小麦两种雄性不育系统进行了杂种制种和杂种性能的比较。将17个以timopheevi细胞质为基础的杂交组合与其基因等效的cha促进组合进行了比较。采用相同的恢复系作为亲本，在CMS和cha杂交中保持遗传等效。在研究雌系行为和杂交种子产量的第一个试验中，CHA处理的株系高度显著低于对照，而CMS处理的株系高度与对照相似。两种系统的灭菌率相同。CMS系的异交率几乎是CHA处理系的两倍。CMS系杂交种子千粒重大于CHA处理系和对照。平均而言，CMS系种子发芽率是CHA处理系的2倍，有效异交率是CHA处理系的3倍。第二项试验研究了两种雄性不育体系杂种的产量性能。本试验共选育40份，其中杂交种20份，亲本20份。以CMS为基础的杂交种的平均产量高于以cha为基础的杂交种B系和R系。所有CMS系杂交杂交种的产量均显著高于其优良亲本，而除2个杂交杂交种外，其余cha系杂交种的产量均未显著高于其优良亲本。讨论了基于CMS和基于cha的混合性能差异的可能原因。
A comparison of two male sterility systems was carried out in wheat for hybrid seed production and hybrid performance. Seventeen hybrid combinations based on Triticum timopheevi cytoplasm were compared with their genetically equivalent CHA-facilitated combinations. The same set of restorer lines was used as parents in CMS- and CHA-based hybrids to maintain genetic equivalence. In the first experiment aimed at study of female line behavior and crossed seed production, the CHA treated lines showed significantly shorter heights whereas CMS lines were similar to the control. The two systems were equally effective in sterilizing rate. The outcrossing percentage of the CMS lines was almost twice that of the CHA treated lines. Thousand-grain weight of the crossed seeds on CMS lines was greater than on the CHA treated lines and control. On average, the germination percentage of seeds on CMS lines was double that of the CHA treated lines and the percentage of effective outcrossed seeds in CMS lines was 3 times more than that from CHA treated lines. The second experiment was conducted to examine the yield performance of the hybrids derived from the two systems of male sterility. A total of 40 entries including 20 hybrids and 20 parents were evaluated in the experiment. The mean grain yield of the CMS- based hybrids was greater than that of the CHA-based hybrids, the B and R lines. All the CMS- based hybrids showed significantly higher grain yields than their better parents whereas all the CHA-based hybrids, except two, showed no significant yield increases over their better parents. Possible reasons for differences in CMS- and CHA-based hybrid performance are discussed.