尿囊素调节热胁迫下玉米(Zea mays L.)的氧化防御、次生代谢和离子平衡

IF 3.4 3区 生物学 Q1 PLANT SCIENCES Physiology and Molecular Biology of Plants Pub Date : 2024-10-01 Epub Date: 2024-10-23 DOI:10.1007/s12298-024-01519-5
Humaira Yasmeen, Rizwan Rasheed, Muhammad Arslan Ashraf, Sadia Zafar, Shafaqat Ali
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引用次数: 0

摘要

了解玉米如何应对温度胁迫对于提高其在不断变化的气候条件下的抗逆性和生产力至关重要。以往的研究表明,外源尿囊素(ALA)能调节植物在镉和盐度胁迫下的各种生理过程。现有文献对 ALA 对玉米植物在热胁迫下的生理和生化反应影响的具体机制了解有限。本研究旨在探讨 ALA 在热胁迫下调节玉米氧化防御、次生代谢和离子平衡的作用,最终目的是提高玉米的抗逆性和生产力。目前的研究显示,在热胁迫下,玉米栽培品种(耐热品种 Pearl 和敏感品种 Pak-afgoi)的生长、叶绿素含量和养分吸收均受到明显抑制。热胁迫使植物体内的 MDA 和 H2O2 水平升高,表明 ROS 解毒功能受阻,这可能会更严重地阻碍植物对养分的吸收。Pak afgoi。ALA(150 毫克/升和 300 毫克/升)促进了植物对热胁迫的耐受性。ALA(300 毫克/升)增加了酶的抗氧化活性和抗氧化分子的积累,从而降低了细胞的 ROS 水平。ALA 增加了渗透溶质的积累,提高了叶绿素和养分的吸收,减轻了玉米在热胁迫下的氧化损伤。从热胁迫中恢复 72 小时后,ALA 显著提高了生物量、光合色素、ROS 解毒能力和养分吸收能力,同时将氧化损伤降至最低,帮助植物从热胁迫中快速恢复:在线版本包含补充材料,可查阅 10.1007/s12298-024-01519-5。
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Allantoin regulated oxidative defense, secondary metabolism and ions homeostasis in maize (Zea mays L.) under heat stress.

Understanding how maize responds to temperature stress is crucial for improving its resilience and productivity under changing climate conditions. Previous studies have shown that exogenous allantoin (ALA) regulates various physiological processes in plants under cadmium and salinity stress. The existing body of literature provides limited insight into the specific mechanisms that govern the impact of ALA on the physiological and biochemical responses of maize plants under heat stress. This study aims to investigate the role of ALA in regulating oxidative defense, secondary metabolism, and ion homeostasis in maize under heat stress, with the ultimate goal of improving maize resilience and productivity. The current investigation displayed visible depression in growth, chlorophyll content, and nutrient uptake in maize cultivars (tolerant cv. Pearl and sensitive cv. Pak-afgoi) under heat stress. Heat stress raised MDA and H2O2 levels in plants, indicating hampered ROS detoxification that might have impeded nutrient acquisition in plants more profoundly in heat-sensitive cv. Pak afgoi. ALA (150 and 300 mg L-1) promoted plant heat stress tolerance. ALA (300 mg L-1) increased enzymatic antioxidant activities and antioxidant molecule buildup, which diminished cell ROS levels. ALA increased osmolyte accumulation, raised chlorophyll and nutrient uptake, and mitigated oxidative damage in maize under heat stress. After 72 h of recovery from heat stress, ALA significantly enhanced biomass, photosynthetic pigments, ROS detoxification, and nutrient uptake while minimizing oxidative damage, aiding rapid plant recovery from heat stress.

Supplementary information: The online version contains supplementary material available at 10.1007/s12298-024-01519-5.

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来源期刊
CiteScore
7.10
自引率
0.00%
发文量
126
期刊介绍: Founded in 1995, Physiology and Molecular Biology of Plants (PMBP) is a peer reviewed monthly journal co-published by Springer Nature. It contains research and review articles, short communications, commentaries, book reviews etc., in all areas of functional plant biology including, but not limited to plant physiology, biochemistry, molecular genetics, molecular pathology, biophysics, cell and molecular biology, genetics, genomics and bioinformatics. Its integrated and interdisciplinary approach reflects the global growth trajectories in functional plant biology, attracting authors/editors/reviewers from over 98 countries.
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