Spermidine alleviates drought-induced wheat floret degeneration by mitigating oxidative damage and maintaining energy homeostasis

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外文摘要：Drought stress at the booting stage causes severe floret degeneration and a decrease in grain number.Polyamines are involved in wheat floret development under drought stress,but the underlying physio-logical mechanisms are unclear.This study showed that drought-induced accumulation of reactive oxy-gen species led to wheat spikelet cell apoptosis and floret degeneration.Drought induced stomatal closure to reduce photosynthesis,then inhibited the activities of sucrose phosphate synthase,sucrose synthetase(cleavage direction)and ADP-glucose pyrophosphorylase in spikes and leaves,and soluble vacuolar invertase and cell wall invertase in spikes,thus providing a poor nutrient base for floret devel-opment.Exogenous spermidine application increased antioxidant enzyme activities and polyamine metabolism,promoted starch and sucrose metabolism,amino acid utilization and increased the levels of glycolytic and tricarboxylic acid cycle intermediates to mitigate oxidative damage and maintain energy homeostasis in the spike,thereby reducing floret degeneration and increasing grain number.

外文关键词：

Drought stressPolyaminesGrain numberAmino acidCarbohydrate metabolism

作者：

Juan Li、Gege Li、Zhiyuan Li、Jiayu Li、Jianke Xiao、Vinay Nangia、Yang Liu

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作者单位：

College of Agronomy,Northwest A&F University,Yangling 712100,Shaanxi,China

Institute of Grain Crops,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,Xinjiang,China

International Center for Agricultural Research in the Dry Areas(ICARDA),P.O.Box 6299-10112,Rabat,Morocco

出版年：

2024

DOI：

10.1016/j.cj.2024.07.017

作物学报(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.12(6)