Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.)

IMR OpenIR

	Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.)
	Du Qi; Zhao Xinhua; Xia Le; Jiang Chunji; Wang Xiaoguang; Han Yi; Wang Jing; Yu Haiqiu
	2019
发表期刊	JOURNAL OF INTEGRATIVE AGRICULTURE
ISSN	2095-3119
卷号	18 期号:2 页码:395-406
摘要	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(-center dot)) and hydrogen peroxide (H2O2). 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(-center dot) and H2O2. 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.
关键词	ARABIDOPSIS ROOT RESPONSE CHLOROPHYLL FLUORESCENCE LIPID-PEROXIDATION HYDROGEN-PEROXIDE OXIDATIVE STRESS SALT-TOLERANT ORYZA-SATIVA COTTON LEAVES CULTIVARS potassium deficiency maize photosynthesis chloroplast ultrastructure ROS and antioxidant
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [National Key Technology R&D Program of China]
CSCD记录号	CSCD:6429133
引用统计	被引频次：7[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156087
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 GB/T 7714	Du Qi,Zhao Xinhua,Xia Le,et al. Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.)[J]. JOURNAL OF INTEGRATIVE AGRICULTURE,2019,18(2):395-406.
APA	Du Qi.,Zhao Xinhua.,Xia Le.,Jiang Chunji.,Wang Xiaoguang.,...&Yu Haiqiu.(2019).Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.).JOURNAL OF INTEGRATIVE AGRICULTURE,18(2),395-406.
MLA	Du Qi,et al."Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.)".JOURNAL OF INTEGRATIVE AGRICULTURE 18.2(2019):395-406.