Department of Genetics, Plant Breeding and Biotechnology, West Pomeranian University of Technology, Szczecin, Słowackiego 17, Poland.
PLoS One. 2018 Jun 18;13(6):e0199335. doi: 10.1371/journal.pone.0199335. eCollection 2018.
Shortening rye stems to improve lodging resistance is among the major tasks awaiting breeders of this cereal. The most straightforward way to achieve this goal is the implementation of a dominant dwarfing gene into high yielding cultivars. The choice of dominant dwarfing genes in rye is limited to Ddw1 and Ddw3 loci, which are well characterized with respect to map position and tightly linked molecular markers on the long arms of chromosomes 5RL and 1RL, respectively. This paper reports on the identification and preliminary characterization of a novel dominant dwarfing gene, Ddw4, from line S44. This was mapped within the centromeric region of chromosome 3R. The Ddw4 gene is sensitive to exogenous gibberellin. Its introduction into the rye populational cultivar Dańkowskie Amber decreased plant height by c. 54% without any negative effects on spike length and number of kernels per spike. Further genetic studies are needed to determine the perspectives for application of the newly detected dwarfing gene into breeding programs for short-stem rye.
缩短黑麦茎秆以提高抗倒伏性是该谷物育种者面临的主要任务之一。实现这一目标最直接的方法是将显性矮秆基因导入高产品种。在黑麦中，选择显性矮秆基因仅限于 Ddw1 和 Ddw3 基因座，它们在图谱位置和紧密连锁的分子标记方面在染色体 5RL 和 1RL 的长臂上得到了很好的描述。本文报道了来自 S44 品系的一个新的显性矮秆基因 Ddw4 的鉴定和初步特征。该基因位于染色体 3R 的着丝粒区域内。Ddw4 基因对外源赤霉素敏感。将其导入黑麦群体品种 Danｋowskie Amber 中，植株高度降低了约 54%，而对穗长和每穗粒数没有任何负面影响。需要进一步的遗传研究来确定新发现的矮秆基因在短茎黑麦育种计划中的应用前景。
