Delayed development of basal spikelets in wheat explains their increased floret abortion and rudimentary nature
Delayed development of basal spikelets in wheat explains their increased floret abortion and rudimentary nature
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小麦基部小穗发育延迟解释了其小花败育和发育不良的增加
DOI：
10.1101/2023.02.17.528935
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Backhaus A
中科院分区：
文献类型：
--
作者：
Backhaus A
不同小麦品种(Triticum aestivumL.)的每穗粒数差异很大。斯派克。中心的小穗产生最多的籽粒，而顶端和基生的小穗生产力较低，最基生的小穗通常只发育为不发育的形式。基生小穗在起始时间延迟，但它们继续发育和产生小花。他们堕胎的确切时间或原因在很大程度上仍不清楚。在这里，我们调查了基本小穗败育的潜在原因在田间遮荫应用。我们发现，基本小穗败育很可能是小花完全败育的结果，因为两者同时发生，并且对遮荫处理有相同的反应。我们发现，在整个峰值上，同化物利用率没有差异。相反，我们发现基本小花开花前发育年龄的减少与其败育的增加密切相关。利用败育前的发育年龄，我们能够预测每穗的最终结实粒数，以及从基生小穗到中心小穗的粒数的特征梯度。因此，未来改善小穗均一性的努力可以集中在改善基本小穗的建立和提高败育前的小花发育率上。
Large differences exist in the number of grains per spikelet across an individual wheat (Triticum aestivumL.) spike. The central spikelets produce the highest number of grains, while apical and basal spikelets are less productive, and the most basal spikelets are commonly only developed in rudimentary form. Basal spikelets are delayed in initiation, yet they continue to develop and produce florets. The precise timing or the cause of their abortion remains largely unknown. Here, we investigated the underlying causes of basal spikelet abortion using shading applications in the field. We found that basal spikelet abortion is likely to be the consequence of complete floret abortion, as both occur concurrently and have the same response to shading treatments. We detected no differences in assimilate availability across the spike. Instead, we show that the reduced developmental age of basal florets pre-anthesis is strongly associated with their increased abortion. Using the developmental age pre-abortion, we were able to predict final grain set per spikelet across the spike, alongside the characteristic gradient in the number of grains from basal to central spikelets. Future efforts to improve spikelet homogeneity across the spike could thus focus on improving basal spikelet establishment and increasing floret development rates pre-abortion.
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