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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F_1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。
XNOOO4 is a new wheat new dwarf source line with partial dwarf dominant effect crossed with Qing 431 and Xiaoyan 6. Compared with the high-stalked parents, the average stalking effect of hybrid F1 was 13.8%, which was insensitive to the external gibberellic acid reaction. In the hybrid wheat study, its combining ability was excellent, the yield was increased, the number of grains per spike was increased, Enhanced ability and increased harvest index. Without some unfavorable effects of some short sources on hybrid F_1, it is an ideal dwarf parent for hybrid wheat and can be used as an excellent dwarf variety for conventional breeding. Chromosome mapping of the XNOOO4 abundance dwarf dominant gene was carried out using the methods of Chinese spring deficiency-tetrasosome and double-end analysis. It was proved that the dwarf dominant gene was located on the short arm of chromosome 2A, which was different from that in the world Located the new dwarf gene of 20 Rht genes, so tentatively named dwarf gene dwarf Rht21.