| 摘要: |
| XNOOO4是青431与小偃6号杂交选育的一个新的具有部分矮秆显性效应的小麦新矮源品系。和高秆亲本相比,其杂种F_1代的降秆作用平均为13.8％,对外源赤霉酸反应不敏感,在杂种小麦研究中,其配合力优良,增产显著,穗粒数增加,抗倒能力增强,收获指数提高等,无某些矮源对杂种F1产生的不良效应,是杂种小麦比较理想的矮秆亲本,可作为常规育种的优良矮秆品种资源。用中国春缺—四体和双端体分析的方法,对XNOOO4丰矮秆显性基因进行了染色体定位,证明其矮秆显性基因位于2A染色体的短臂上,是一个不同于世界上已定位的20个Rht基因的新矮源,故暂定名为显性矮秆基因Rht21。 |
| 关键词: 小麦,显性矮秆基因,基因定位,杂交育种 |
| DOI： |
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| 基金项目:国家和陕西省“八五”攻关项目 |
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Yang Tianzhang Zhang Xiaoke Liu Hongwei Wang Zhonghua
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| Abstract: |
| XN0004 is a new dwarf wheat variety derived from the progeny of Qing 431× Xiaoyan 6. The dwarfing effect is controlled by a partially dominant gene which reduces plant height by 13. 8% on an average in heterozygotes as compared with that of tall parents and is insensitive to exogenous gibberelic acid. Results of CS nulli-tetrasomic and ditelosomic analysis indicated that the Rht gene is located on the short arm of chromosome 2A. It might be a new dominant dwarfing gene and therefore the gene symbol Rht 21 is designated provisionally. According to a previous study, there were no any side effects on agronomic characters with XN0004 and the hybrids with XN0004 as one of their parents showed higher heterosis suggesting that XN0004 might be a useful source for conventional and hybrid wheat breeding. |
| Key words: Triticum aeslivum. dominant: dwarfing gene, gene loction. hybrid wheat, |
