Photosynthesis, photosystem II efficiency, amino acid metabolism and ion distribution in rice (Oryza sativa L.) in response to alkaline stress

被引:19
作者
Wu, Z. -H. [1 ]
Yang, C. -W. [2 ]
Yang, M. -Y. [1 ,3 ]
机构
[1] Jilin Agr Univ, Dept Agron, Changchun 130118, Jilin Province, Peoples R China
[2] NE Normal Univ, MOE, Key Lab Mol Epigenet, Changchun 130024, Jilin Province, Peoples R China
[3] Jilin Agr Univ, Sch Life Sci, Changchun 130118, Jilin Province, Peoples R China
基金
中国国家自然科学基金;
关键词
alkaline stress; rice; photosynthesis; photosystem II efficiency; amino acid metabolism; SALT-STRESS; BALANCE; GROWTH;
D O I
10.1007/s11099-014-0002-4
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Alkalies are important agricultural contaminants complexly affecting plant metabolism. In this study, rice seedlings were subjected to alkaline stress (NaHCO3:Na2CO3 = 9:1; pH 8.9) for 30 days. The results showed that stress mightily reduced net photosynthetic rate (P (N)), but slightly decreased transpiration rate and stomatal conductance. This indicated that decline of P (N) might be a result of nonstomatal factors. Alkaline stress caused a large accumulation of Na+ in leaves up to toxic concentration, which possibly affected chloroplast ultrastructure and photosynthesis. We found that alkaline stress reduced chlorophyll fluorescence parameters, such as ratios of F-v'/F-m', F-v/F-m, photosystem (PS) II efficiency, and electron transport rates in rice plants, i.e. it influenced the efficiencies of photon capture and electron transport by PSII. This might be a main reason for the decrease of P (N) under such conditions. Deficiency of minerals could be another reason for the decline of P (N). Alkaline stress lowered contents of N, K, Cu, Zn, P, and Fe in rice plants. In addition, the stress strongly affected metabolism of amino acids. This might be caused by imbalance in carbon metabolism as a result of photosynthesis reduction.
引用
收藏
页码:157 / 160
页数:4
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