Exogenous γ-aminobutyric acid (GABA) enhances rye (Secale cereale) seedling resistance to combined freeze-thaw and cadmium stress.

IF 2.6 4区生物学 Q2 PLANT SCIENCES

Functional Plant Biology Pub Date : 2024-10-01 DOI:10.1071/FP24205

Huixin Wang, Guozhang Bao, Lingzhi Tian, Simeng Chen, Yanan Xu, Guomei Li, Hongwei Zhao

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引用次数: 0

Abstract

Freeze-thaw is a common stress at high altitudes in northern China. There is a risk of cadmium (Cd) contamination in the region. γ-aminobutyric acid (GABA) is a natural product that regulates plant growth. Rye (Secale cereale ) was used as research material to investigate the physiological effects of exogenous GABA on rye seedlings under the single and combined stresses of freeze-thaw and cadmium. The results showed that the combined stress severely inhibited shoot length, root length, fresh weight, and dry weight, increased malondialdehyde and hydrogen peroxide contents, and significantly decreased superoxide dismutase (SOD) activity. Foliar application of 5mM GABA alleviated the negative effects of stress on seedling growth, increased soluble protein content, and reduced malondialdehyde and hydrogen peroxide contents. Exogenous GABA application also enhanced the activities of SOD and peroxidase (POD). Additionally, the presence of exogenous GABA activated the GABA metabolic process and encouraged the accumulation of phytochelatins, glutathione, and non-protein thiol. These results indicate that exogenous GABA can effectively improve the resistance of rye seedlings to freeze-thaw and Cd by regulating the antioxidant enzyme system and enhancing its own detoxification mechanism, and they provide a basis for future applications of exogenous GABA, which is beneficial for ecological protection.

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外源γ-氨基丁酸（GABA）可增强黑麦（Secale cereale）幼苗对冻融和镉联合胁迫的抗性。

冻融是中国北方高海拔地区常见的一种压力。该地区存在镉（Cd）污染的风险。γ-氨基丁酸（GABA）是一种调节植物生长的天然产物。以黑麦（Secale cereale）为研究材料，探讨了外源 GABA 在冻融和镉单一胁迫及联合胁迫下对黑麦幼苗的生理影响。结果表明，联合胁迫严重抑制了黑麦幼苗的芽长、根长、鲜重和干重，增加了丙二醛和过氧化氢的含量，并显著降低了超氧化物歧化酶（SOD）的活性。叶面喷施 5mM GABA 可减轻胁迫对幼苗生长的负面影响，增加可溶性蛋白质含量，降低丙二醛和过氧化氢含量。施用外源 GABA 还能提高 SOD 和过氧化物酶（POD）的活性。此外，外源 GABA 激活了 GABA 代谢过程，促进了植物螯合素、谷胱甘肽和非蛋白质硫醇的积累。这些结果表明，外源 GABA 可通过调节抗氧化酶系统和增强自身解毒机制，有效提高黑麦幼苗对冻融和镉的抗性，为今后应用外源 GABA 提供了依据，有利于生态保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Functional Plant Biology 生物-植物科学

CiteScore

5.50

自引率

3.30%

发文量

156

审稿时长

1 months

期刊介绍： Functional Plant Biology (formerly known as Australian Journal of Plant Physiology) publishes papers of a broad interest that advance our knowledge on mechanisms by which plants operate and interact with environment. Of specific interest are mechanisms and signal transduction pathways by which plants adapt to extreme environmental conditions such as high and low temperatures, drought, flooding, salinity, pathogens, and other major abiotic and biotic stress factors. FPB also encourages papers on emerging concepts and new tools in plant biology, and studies on the following functional areas encompassing work from the molecular through whole plant to community scale. FPB does not publish merely phenomenological observations or findings of merely applied significance. Functional Plant Biology is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science. Functional Plant Biology is published in affiliation with the Federation of European Societies of Plant Biology and in Australia, is associated with the Australian Society of Plant Scientists and the New Zealand Society of Plant Biologists.