锻炼缓解了灌浆期干旱胁迫对小麦籽粒淀粉和蛋白质品质的负面影响

doi:10.1016/j.jia.2024.05.008

摘要/Abstract

摘要： 干旱胁迫对作物产量和品质的负面影响十分显著。已有研究表明，植物在生长阶段早期进行干旱锻炼可以提高其在生殖阶段对干旱胁迫的耐受性，但干旱锻炼对籽粒品质的影响尚不清楚。本研究旨在探讨干旱胁迫下，干旱锻炼对籽粒灌浆期淀粉和蛋白质含量的影响。研究结果表明，干旱胁迫导致淀粉含量及其组分显著减少，同时增加了谷蛋白大聚合物和蛋白质组分的含量。值得注意的是，与未经锻炼植株相比，经过干旱锻炼的植物在干旱胁迫下（PD）表现出淀粉含量及其组分下降程度的明显缓解，从而改善了淀粉的膨胀力和糊化特性。此外， PD总蛋白质含量的上升幅度显著低于未锻炼植株。总之，本研究明确了干旱锻炼作为一种有效策略，主要通过减少淀粉损失和控制蛋白质含量上升等来抵消干旱胁迫对籽粒品质负面影响。

Abstract: The impact of drought stress on crop yield and quality is substantial. Drought priming during the early growth stage of plants has been shown to improve tolerance to drought stress during the reproductive stage, although its effects on grain quality remains elusive. This study aimed to investigate the influence of drought priming on starch and protein levels in grains under drought stress during grain filling. Our results reveal that drought stress results in a reduction in starch content and its constituents, while simultaneously increasing glutenin macropolymers and protein fractons. Notably,, drought primed plants under drought stress (PD) exhibit mitigated declines in starch content and its components, leading to improvements in starch swelling power and pasting properties. Additionally, PD results in a slight increase in protein fractions, limiting the overall rise in total protein content compared to drought stress alone. Collectively, our study underscores the efficacyof drought priming as a strategy to counteract the negative effects of drought stress on grain quality, particularly by minimizing starch losses and restraining protein content elevation.

Key words: wheat , drought priming , , starch , , protein , , quality , , amino acid

. 锻炼缓解了灌浆期干旱胁迫对小麦籽粒淀粉和蛋白质品质的负面影响[J]. Journal of Integrative Agriculture, DOI: 10.1016/j.jia.2024.05.008.

Liulong Li, Zhiqiang Mao, Pei Wang, Jian Cai, Qin Zhou, Yingxin Zhong, Dong Jiang, Xiao Wang. Drought priming enhances wheat grain starch and protein quality under drought stress during grain filling[J]. Journal of Integrative Agriculture, DOI: 10.1016/j.jia.2024.05.008.

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