Elevated CO2 Concentration Enhances Drought Tolerance by Mitigating Oxidative Stress and Enhancing Carbon Assimilation in Foxtail Millet (Setaria italica)

IF 3.7 2区 农林科学 Q1 AGRONOMY Journal of Agronomy and Crop Science Pub Date : 2024-10-20 DOI:10.1111/jac.12778
Xiaoqin Zhang, Yuqian Duan, Qijun Xing, Ruonan Duan, Jie Shen, Yuzheng Zong, Dongsheng Zhang, Xinrui Shi, Ping Li, Xingyu Hao
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Abstract

Elevated CO2 concentration (eCO2) can modulate the response of crop plants to drought stress (DS). This study aimed to investigate the response of leaf gas exchange, chlorophyll fluorescence, antioxidant activities, osmotic adjustment substance, phytohormone and signal transduction regulatory enzymes, as well as related genes in foxtail millet to DS (water stress for 10 days), ambient condition (aCO2, 400 μmol mol−1) and eCO2 (600 μmol mol−1). eCO2 significantly increased the net photosynthetic rate, maximum net photosynthetic rate, chlorophyll a content, transpiration rate and stomatal conductance, but did not affect leaf instantaneous water-use efficiency under DS. eCO2 also significantly enhanced the quantum yield of Photosystem II (PSII), photosynthetic electron transport, and proportion of open PSII reaction centers under DS. Moreover, eCO2 significantly increased abscisic acid (ABA) content, proline content, and the activities of peroxidase, superoxide dismutase, and calcium-dependent protein kinase under DS, leading to a significant reduction in malondialdehyde content. eCO2 significantly increased the expressions of gene encoding ABA-, stress- and ripening-induced proteins and ABA-responsive element binding factor under DS. Our results clearly demonstrated the vital role of eCO2 in mitigating the drought-induced damage over ambient CO2 grown foxtail millet.

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高浓度二氧化碳通过减轻氧化应激和提高狐尾黍(Setaria italica)的碳同化作用增强其耐旱性
二氧化碳浓度(eCO2)的升高可调节作物对干旱胁迫(DS)的响应。本研究旨在探讨狐尾粟的叶片气体交换、叶绿素荧光、抗氧化活性、渗透调节物质、植物激素和信号转导调节酶以及相关基因对干旱胁迫(水胁迫10天)、环境条件(aCO2,400 μmol mol-1)和eCO2(600 μmol mol-1)的响应。在 DS 条件下,eCO2 能明显提高净光合速率、最大净光合速率、叶绿素 a 含量、蒸腾速率和气孔导度,但不影响叶片的瞬时水分利用效率。此外,在 DS 条件下,eCO2 还能显著提高脱落酸(ABA)含量、脯氨酸含量以及过氧化物酶、超氧化物歧化酶和钙依赖蛋白激酶的活性,从而显著降低丙二醛含量。我们的研究结果清楚地表明,eCO2 在减轻干旱引起的损害方面比环境 CO2 生长的狐尾粟起着至关重要的作用。
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来源期刊
Journal of Agronomy and Crop Science
Journal of Agronomy and Crop Science 农林科学-农艺学
CiteScore
8.20
自引率
5.70%
发文量
54
审稿时长
7.8 months
期刊介绍: The effects of stress on crop production of agricultural cultivated plants will grow to paramount importance in the 21st century, and the Journal of Agronomy and Crop Science aims to assist in understanding these challenges. In this context, stress refers to extreme conditions under which crops and forages grow. The journal publishes original papers and reviews on the general and special science of abiotic plant stress. Specific topics include: drought, including water-use efficiency, such as salinity, alkaline and acidic stress, extreme temperatures since heat, cold and chilling stress limit the cultivation of crops, flooding and oxidative stress, and means of restricting them. Special attention is on research which have the topic of narrowing the yield gap. The Journal will give preference to field research and studies on plant stress highlighting these subsections. Particular regard is given to application-oriented basic research and applied research. The application of the scientific principles of agricultural crop experimentation is an essential prerequisite for the publication. Studies based on field experiments must show that they have been repeated (at least three times) on the same organism or have been conducted on several different varieties.
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