Photoperiod sensitivity affects flowering duration in wheat
Photoperiod sensitivity affects flowering duration in wheat
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DOI：
10.1017/s0021859616000125
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发表时间：
2017-01-01
影响因子：
2
通讯作者：
Griffiths, S.
中科院分区：
文献类型：
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作者：
Jones, H. E.;Lukac, M.;Griffiths, S.
小麦开花和授粉成功与否是决定籽粒产量和品质的关键因素。面包小麦系'Paragon'，渗入与单个或多个日长不敏感等位基因，被用来解剖的影响，开花的时间和持续时间内的一个层次的植物结构。在一系列盆栽和田间试验中观察了小麦植株的开花。Ppd-D1 a是已知影响开花时间最有效的等位基因，在所有实验中开花所需的热时间最少。个别行的开花持续时间占主导地位的转变开始开花后分蘖和分蘖单株数，而不是个别穗开花持续时间的变化。开花持续时间和开花开始时间之间有很强的关系，最早的品系开花时间最长。分蘖之间的最大开花重叠记录为Ppd-1b。在所有品系中，较温暖的环境显着减少了开花的持续时间和Ppd-1a等位基因对开花开始的影响。这些发现提供了Ppd-1a等位基因多效性效应的证据，并对育种增加抗逆小麦品种有直接影响。
Flowering and successful pollination in wheat are key determinants of both quantity and quality of grain. Bread wheat line 'Paragon', introgressed with single or multiple daylength insensitivity alleles was used to dissect the effects on the timing and duration of flowering within a hierarchical plant architecture. Flowering of wheat plants was observed in a series of pot-based and field experiments. Ppd-D1a was the most potent known allele affecting the timing of flowering, requiring the least thermal time to flowering across all experiments. The duration of flowering for individual lines was dominated by the shift in the start of flowering in later tillers and the number of tillers per plant, rather than variation in flowering duration of individual spikes. There was a strong relationship between flowering duration and the start of flowering with the earliest lines flowering for the longest. The greatest flowering overlap between tillers was recorded for the Ppd-1b. Across all lines, a warmer environment significantly reduced the duration of flowering and the influence of Ppd-1a alleles on the start of flowering. These findings provide evidence of pleiotropic effects of the Ppd-1a alleles, and have direct implications for breeding for increased stress resilient wheat varieties.