Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.)
查看参考文献51篇
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文摘
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Potassium (K) deficiency significantly decreases photosynthesis due to leaf chlorosis induced by accumulation of reactive oxygen species (ROS). But, the physiological mechanism for adjusting antioxidative defense system to protect leaf function in maize (Zea mays L.) is unknown. In the present study, four maize inbred lines (K-tolerant, 90-21-3 and 099; K-sensitive, D937 and 835) were used to analyze leaf photosynthesis, anatomical structure, chloroplast ultrastructure, ROS, and antioxidant activities. The results showed that the chlorophyll content, net photosynthetic rate (P_n), stomatal conductance (G_s), photochemical quenching (q_P), and electron transport rate of PSII (ETR) in 90-21-3 and 099 were higher than those in D937 and 835 under K deficiency treatment. Parameters of leaf anatomical structure in D937 that were significantly changed under K deficiency treatment include smaller thickness of leaf, lower epidermis cells, and vascular bundle area, whereas the vascular bundle area, xylem vessel number, and area in 90-21-3 were significantly larger or higher. D937 also had seriously damaged chloroplasts and PSII reaction centers along with increased superoxide anion (O_2~-·) and hydrogen peroxide (H_2O_2). Activities of antioxidants, like superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), were significantly stimulated in 90-21-3 resulting in lower levels of O_2~-· and H_2O_2. These results indicated that the K-tolerant maize promoted antioxidant enzyme activities to maintain ROS homeostasis and suffered less oxidative damage on the photosynthetic apparatus, thereby maintaining regular photosynthesis under K deficiency stress. |
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来源
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Journal of Integrative Agriculture
,2019,18(2):395-406 【核心库】
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DOI
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10.1016/S2095-3119(18)61953-7
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关键词
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potassium deficiency
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maize
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photosynthesis
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chloroplast ultrastructure
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ROS and antioxidant
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地址
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1.
College of Agronomy, Shenyang Agricultural University, Shenyang, 110866
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Bureau of Liaoning Provincial Seed Management, Shenyang, 110034
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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2095-3119 |
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学科
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农作物 |
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基金
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国家自然科学基金
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the National Key Technology R&D Program of China
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文献收藏号
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CSCD:6429133
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