晚春冷通过调节冬小麦穗生长和同化物的分配,减少各穗位粒数

IF 6 1区 农林科学 Q1 AGRONOMY
Feifei Lin , Cheng Li , Bo Xu , Jian Chen , Anheng Chen , Muhammad A. Hassan , Binbin Liu , Hui Xu , Xiang Chen , Jianqiang Sun , Jincai Li
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引用次数: 3

摘要

晚春冷发生在小麦生殖期,影响了生殖期小穗和小花的分化,此时小穗对冷非常敏感。然而,在LSC下,小麦小穗在不同位置、叶片和茎的反应以及它们之间在生理水平上的相互作用仍不清楚。在人工气候室中,在2°C、−2°C和持续时间(1、2和3天)的两个温度(2°C)下,在小穗末期进行为期两年的处理,以比较LSC对小麦品种延农19(YN19,耐寒)和新麦26(XM26,冷敏)的粒数和产量的影响。夜间温度制度旨在重现自然温度变化。LSC延缓植物生长,抑制穗和小花分化,导致两个品种的高产损失。LSC降低了穗、茎和叶中的干物质积累(DMA,g),降低了穗与叶和穗与茎的DMA比率。在YN19的上部和基部小穗中,植物细胞壁转化酶(CWINV)活性增加,而在XM26的中部小穗中CWINV活性增加。在LSC下,可溶性糖和葡萄糖主要在上部和基部小穗中运输和分布,用于颖片和轴的发育,因此YN19的穗发育相对完整,而上部和基生小穗严重受损,中间小穗的大部分颖片在XM26中相对完整,导致花粉败育主要在上部和基部小穗。LSC后颖片和轴的发育受到影响,每穗粒数减少,籽粒主要出现在中间小穗。总的来说,LSC下总DMA和干物质分配到穗部的减少导致小穗发育不良,导致粮食产量的高损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Late spring cold reduces grain number at various spike positions by regulating spike growth and assimilate distribution in winter wheat

Late spring cold (LSC) occurred in the reproductive period of wheat impairs spike and floret differentiation during the reproductive period, when young spikelets are very cold-sensitive. However, under LSC, the responses of wheat spikelets at various positions, leaves, and stems and the interactions between them at physiological levels remain unclear. In the present study, two-year treatments at terminal spikelet stage under two temperatures (2 °C, −2 °C) and durations (1, 2, and 3 days) were imposed in an artificial climate chamber to compare the effects of LSC on grain number and yield in the wheat cultivars Yannong 19 (YN19, cold-tolerant) and Xinmai 26 (XM26, cold-sensitive). The night temperature regimes were designed to reproduce natural temperature variation. LSC delayed plant growth and inhibited spike and floret differentiation, leading to high yield losses in both cultivars. LSC reduced dry matter accumulation (DMA, g) in spikes, stems, and leaves, reducing the DMA ratios of the spike to leaf and spike to stem. Plant cell wall invertase (CWINV) activity increased in upper and basal spikelets in YN19, whereas CWINV increased in middle spikelets in XM26. Under LSC, soluble sugar and glucose were transported and distributed mainly in upper and basal spikelets for glume and rachis development, so that spike development was relatively complete in YN19, whereas the upper and basal spikelets were severely damaged and most of the glumes in middle spikelets were relatively completely developed in XM26, resulting in pollen abortion mainly in upper and basal spikelets. The development of glumes and rachides was influenced and grain number per spike was decreased after LSC, with kernels present mainly in middle spikelets. Overall, reduced total DMA and dry matter partitioning to spikes under LSC results in poor spikelet development, leading to high losses of grain yield.

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来源期刊
Crop Journal
Crop Journal Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
9.90
自引率
3.00%
发文量
638
审稿时长
41 days
期刊介绍: The major aims of The Crop Journal are to report recent progresses in crop sciences including crop genetics, breeding, agronomy, crop physiology, germplasm resources, grain chemistry, grain storage and processing, crop management practices, crop biotechnology, and biomathematics. The regular columns of the journal are Original Research Articles, Reviews, and Research Notes. The strict peer-review procedure will guarantee the academic level and raise the reputation of the journal. The readership of the journal is for crop science researchers, students of agricultural colleges and universities, and persons with similar academic levels.
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