The introduction of gibberellin-responsive reduced height (GAR Rht) alleles is a promising tool for breeding semi-dwarf, high-input varieties of wheat. We have compared recombinant isogenic lines F_2:3 carrying dwarfing allele Rht13 and without dwarfing alleles, obtained from the cross of isogenic lines and selected from F₂ using molecular markers. After phenotyping and statistical analysis, we found that the Rht13 allele reduces total plant height by 13.0 cm (17.4%), while the proportions between the internodes in tall and short plants remain similar. The greatest decrease in length in plants with Rht13 in comparison to wild-type plants is observed for the second internode (5.3 cm, or 31.9%). Due to the presence of Rht13, semi-dwarf plants, compared to the wild type, had a higher grain number per main spike, grain number per spikelet and higher number of productive tillers, and a slightly higher harvest index, although thousand grain weight and grain weight in the main spike were lower. Our results indicate the possibility of using Rht13 in the breeding of wheat varieties without dramatic negative effects on yield and plant development.

中文翻译：

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非黑土区赤霉素响应降低高度等位基因Rht13对春面包小麦农艺性状的影响

引入赤霉素反应性减低高度（GAR Rht）等位基因是育种半矮麦，高投入小麦品种的有前途的工具。我们已经比较了携带等位基因Rht13和没有等位基因的重组等基因系F _2：3，这些等位基因从等基因系的杂交中获得，并使用分子标记从F _2中选择。经过表型分析和统计分析，我们发现Rht13等位基因使植株总高度降低了13.0 cm（17.4％），而高矮植株的节间比例却保持相似。Rht13在植物中长度的最大减少与野生型植物相比，第二节间（5.3厘米，或31.9％）被观察到。由于存在Rht13，与野生型相比，半矮植株具有较高的主穗粒数，每个小穗粒数和较高的生产分till数，尽管千粒重和主穗的籽粒重量较低。我们的结果表明在小麦品种育种中使用Rht13的可能性不会对产量和植物发育产生显着的负面影响。