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首页> 美国卫生研究院文献>Breeding Science >Differential contribution of two Ppd-1 homoeoalleles to early-flowering phenotype in Nepalese and Japanese varieties of common wheat
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Differential contribution of two Ppd-1 homoeoalleles to early-flowering phenotype in Nepalese and Japanese varieties of common wheat

机译：尼泊尔和日本普通小麦品种中两个Ppd-1同等位基因对早期开花表型的差异性贡献

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Wheat landraces carry abundant genetic variation in heading and flowering times. Here, we studied flowering-related traits of two Nepalese varieties, KU-4770 and KU-180 and a Japanese wheat cultivar, Shiroganekomugi (SGK). These three wheat varieties showed similar flowering time in a common garden experiment. In total, five significant quantitative trait loci (QTLs) for three examined traits, the heading, flowering and maturation times, were detected using an F2 population of SGK/KU-4770. The QTLs were found at the Ppd-1 loci on chromosomes 2B and 2D and the 2B QTL was also confirmed in another F2 population of SGK/KU-180. The Ppd-D1 allele from SGK and the Ppd-B1 alleles from the two Nepalese varieties might be causal for early-flowering phenotype. The SGK Ppd-D1 allele contained a 2-kb deletion in the 5′ upstream region, indicating a photoperiod-insensitive Ppd-D1a allele. Real-time PCR analysis estimating the Ppd-B1 copy number revealed that the two Nepalese varieties included two intact Ppd-B1 copies, putatively resulting in photoperiod insensitivity and an early-flowering phenotype. The two photoperiod-insensitive Ppd-1 homoeoalleles could independently contribute to segregation of early-flowering individuals in the two F2 populations. Therefore, wheat landraces are genetic resources for discovery of alleles useful for improving wheat heading or flowering times.
机译：小麦地方品种在抽穗期和开花期具有丰富的遗传变异。在这里，我们研究了两个尼泊尔品种KU-4770和KU-180和日本小麦品种Shiroganekomugi（SGK）的开花相关性状。在一个普通的花园实验中，这三个小麦品种显示出相似的开花时间。总共，使用SGK / KU-4770的F2种群检测到三个显着的性状，即抽穗，开花和成熟时间的五个重要的定量性状基因座（QTL）。在2B和2D染色体的Ppd-1基因座上发现了QTL，并且在另一个SGK / KU-180的F2群体中也证实了2B QTL。 SGK的Ppd-D1等位基因和两个尼泊尔品种的Ppd-B1等位基因可能是早期开花表型的原因。 SGK Ppd-D1等位基因在5'上游区域包含2kb缺失，表明对光周期不敏感的Ppd-D1a等位基因。实时PCR分析估计Ppd-B1拷贝数显示，两个尼泊尔品种包括两个完整的Ppd-B1拷贝，推测导致光周期不敏感和早花表型。这两个对光周期不敏感的Ppd-1同等位基因可以独立地促进两个F2种群中早花个体的分离。因此，小麦地方品种是发现等位基因的遗传资源，可用于改善小麦抽穗或开花时间。

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