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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DOI：
10.1093/jxb/erad233
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发表时间：
2023-09-13
影响因子：
6.9
通讯作者：
Uauy, Cristobal
中科院分区：
文献类型：
--
作者：
Backhaus, Anna Elisabeth;Griffiths, Cara;Vergara-Cruces, Angel;Simmonds, James;Lee, Rebecca;Morris, Richard J.;Uauy, Cristobal
小麦（Triticum aestivum L.）穗上每小穗的粒数差异很大。中心的小穗产生的粒数最多，而顶端和基部的小穗产量较低，最基部的小穗通常只发育成初级形态。基生小穗的形成延迟，但它们继续发育并产生小花。他们堕胎的确切时间和原因在很大程度上仍然未知。在这里，我们研究了在田间使用遮光应用的基生小穗败育的潜在原因。我们发现，基部小穗败育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。我们没有发现同化物在穗间的有效性差异。相反，我们表明，基部小花开花前发育年龄的降低与它们的败育增加密切相关。利用败育前的发育年龄，我们能够预测每个小穗的最终粒数，以及从基部到中心的小穗粒数的特征梯度。因此，未来提高穗上小穗均匀性的努力可以集中在提高基部小穗的形成和提高败育前小花的发育率上。小麦基生小穗的不成熟可能是由于它们发育迟缓，而不是由于基生小穗同化物的有效性比中心小穗低
Large differences exist in the number of grains per spikelet across an individual wheat (Triticum aestivum L.) 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. Rudimentary basal wheat spikelets are likely to be a consequence of their delayed development and not due to reduced assimilate availability in basal compared with central spikelets
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影响因子：
7.4
作者：
Backhaus, Anna E.;Lister, Ashleigh;Tomkins, Melissa;Adamski, Nikolai M.;Simmonds, James;Macaulay, Iain;Morris, Richard J.;Haerty, Wilfried;Uauy, Cristobal
通讯作者：
Uauy, Cristobal
DOI：
10.1111/nph.17048
发表时间：
2021-04
期刊：
The New phytologist
影响因子：
--
作者：
Calderini DF;Castillo FM;Arenas-M A;Molero G;Reynolds MP;Craze M;Bowden S;Milner MJ;Wallington EJ;Dowle A;Gomez LD;McQueen-Mason SJ
通讯作者：
McQueen-Mason SJ
影响因子：
3
作者：
González, FG;Slafer, GA;Miralles, DJ
通讯作者：
Miralles, DJ
DOI：
10.1071/pp9800169
发表时间：
1980-01-01
期刊：
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY
影响因子：
--
作者：
FISCHER, RA;STOCKMAN, YM
通讯作者：
STOCKMAN, YM
影响因子：
3
作者：
Alqudah, Ahmad M.;Schnurbusch, Thorsten
通讯作者：
Schnurbusch, Thorsten