Exogenous Glycinebetaine Regulates the Contrasting Responses in Leaf Physiochemical Attributes and Growth of Maize under Drought and Flooding Stresses

文献类型： 外文期刊

第一作者： Wang, Guo-Yun

作者： Wang, Guo-Yun;Ahmad, Shakeel;Wang, Yong;Zhou, Xun-Bo;Wang, Bing-Wei;Shi, Cheng-Qiao;Shi, Li-Bo

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关键词： water stress; foliar glycinebetaine; antioxidant defense; reactive oxygen species; maize

期刊名称：BIOLOGY-BASEL （ 影响因子：3.6； 五年影响因子：3.8 ）

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年卷期： 2024 年 13 卷 6 期

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收录情况： SCI

摘要： Simple Summary Maize production is largely limited by flooding and drought. To mitigate the negative effects of abiotic stress, glycinebetaine is used in this study. However, there are not many research studies that focus on the different roles of glycinebetaine in resisting flooding and drought stresses. The objectives of this study were to reveal the diverse defense mechanisms to flooding and drought that are regulated by foliar glycinebetaine. Drought induced higher antioxidant activities and proline content compared to flooding, while flooding decreased superoxide dismutase as well as guaiacol peroxidase activities and proline content. Antioxidant ability and maize production were further enhanced by glycinebetaine. Glycinebetaine displayed more effects on leaves' physiochemistry under flooding than drought, and it had a greater effect on the sensitive rather than the tolerant variety of maize. Overall, 5.0 mmol/L of glycinebetaine was determined to be the most optimal and effective concentration for mitigating the damage of water stress regarding maize production whilst also having a non-toxic effect. This study provides a potential strategy for mitigating the damage of water stress and for improving maize production.Abstract Flooding and drought are the two most devastating natural hazards limiting maize production. Exogenous glycinebetaine (GB), an osmotic adjustment agent, has been extensively used but there is limited research on its role in mitigating the negative effects of different abiotic stresses. This study aims to identify the different roles of GB in regulating the diverse defense regulation of maize against drought and flooding. Hybrids of Yindieyu 9 and Heyu 397 grown in pots in a ventilated greenhouse were subjected to flooding (2-3 cm standing layer) and drought (40-45% field capacity) at the three-leaf stage for 8 d. The effects of different concentrations of foliar GB (0, 0.5, 1.0, 5.0, and 10.0 mM) on the physiochemical attributes and growth of maize were tested. Greater drought than flooding tolerance in both varieties to combat oxidative stress was associated with higher antioxidant activities and proline content. While flooding decreased superoxide dismutase and guaiacol peroxidase (POD) activities and proline content compared to normal water, they all declined with stress duration, leading to a larger reactive oxygen species compared to drought. It was POD under drought stress and ascorbate peroxidase under flooding stress that played crucial roles in tolerating water stress. Foliar GB further enhanced antioxidant ability and contributed more effects to POD to eliminate more hydrogen peroxide than the superoxide anion, promoting growth, especially for leaves under water stress. Furthermore, exogenous GB made a greater increment in Heyu 397 than Yindieyu 9, as well as flooding compared to drought. Overall, a GB concentration of 5.0 mM, with a non-toxic effect on well-watered maize, was determined to be optimal for the effective mitigation of water-stress damage to the physiochemical characteristics and growth of maize.

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