Trade-off of within-leaf nitrogen allocation between photosynthetic nitrogen-use efficiency and water deficit stress acclimation in rice (Oryza sativa L.)

被引:58
作者
Zhong, Chu [1 ]
Jian, Shao-Fen [2 ]
Huang, Jie [1 ]
Jin, Qian-Yu [1 ]
Cao, Xiao-Chuang [1 ]
机构
[1] China Natl Rice Res Inst, Key Lab Rice Biol, Hangzhou, Zhejiang, Peoples R China
[2] Hunan Agr Univ, Coll Resources & Environm Sci, Changsha, Hunan, Peoples R China
关键词
Leaf N allocation; Water deficit stress; Photosynthetic N-Use efficiency; Limiting factor; Oryza sativa L; THYLAKOID MEMBRANE-PROTEINS; EXCESS LIGHT ENERGY; DROUGHT STRESS; DIFFERENT POSITIONS; LEAVES; CONDUCTANCE; METABOLISM; TOLERANCE; RESPONSES; GROWTH;
D O I
10.1016/j.plaphy.2018.11.021
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Nitrogen (N) allocation in leaves affects plant photosynthesis-N relationship and adaptation to environmental fluctuations. To reveal the role of leaf N allocation in water deficit stress acclimation in rice, the plants were grown in infertile soil supplying with low N (0.05 g N.kg(-1) soil) and high N (0.2 g N.kg(-1) soil), and then imposed to water deficit stress (similar to 75% relative soil water content). We found that the proportion of leaf N allocated in the photosynthetic apparatus was significantly positive correlated with photosynthetic N-use efficiency (PNUE), and that N allocation in the carboxylation system and bioenergetics were the primary two limiting factors of PNUE under the conditions of high N and water deficit stress. PNUE was not significantly affected by water stress in low N condition, but markedly reduced in high N condition. Under low N condition, plants reduced N allocation in the light-harvesting system and increased soluble protein and free amino acids, or reduced N allocation in the cell wall to maintain PNUE under water deficit stress. Under high N, however, plants decreased N allocation in bioenergetics or carboxylation, but increased N allocation in non-photosynthetic components during water stress. Our results reveal that the coordination of leaf N allocation between photosynthetic and non-photosynthetic apparatus, and among the components of the photosynthetic apparatus is important for the trade-off between PNUE and the acclimation of water deficit stress in rice.
引用
收藏
页码:41 / 50
页数:10
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