Potassium modulates central carbon metabolism to participate in regulating CO 2 transport and assimilation in Brassica napus leaves.

Autor: Hu W; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: huws@webmail.hzau.edu.cn., Lu Z; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: zhifenglu@mail.hzau.edu.cn., Meng F; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: mengfanjin@webmail.hzau.edu.cn., Li X; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: lixiaokun@mail.hzau.edu.cn., Cong R; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: congrh@mail.hzau.edu.cn., Ren T; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: rentao@mail.hzau.edu.cn., Lu J; College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China. Electronic address: lunm@mail.hzau.edu.cn.
Jazyk: angličtina
Zdroj: Plant science : an international journal of experimental plant biology [Plant Sci] 2021 Jun; Vol. 307, pp. 110891. Date of Electronic Publication: 2021 Mar 24.
DOI: 10.1016/j.plantsci.2021.110891
Abstrakt: Potassium (K) regulates plant metabolism and enhances plant's ability to adapt to adversity. However, under different K deficiency stress, the net photosynthetic rate (A n ) was reduced, influenced by CO 2 conductance or biochemical capacities. The interplay between metabolome and photosynthetic characteristics under K deficiency stress was analyzed to explore the mechanisms by which K regulates photosynthetic capacity. With increasing K deficiency stress, dominations limiting A n varied from CO 2 conductance to biochemical limitations. Multivariate analyses indicated that organic acids, amino acids and sedoheptulose-7-bisphosphate were significantly related to A n , CO 2 conductance and carboxylation rate. Under moderate K deficiency, organic acids were up-regulated. Acidification of subcellular compartments reduced sedoheptulose-1,7-bisphosphatase activity, inducing downregulation of sedoheptulose-7-bisphosphate and hindrance of ribulose bisphosphate regeneration. Moreover, increased CO 2 shortage with increasing K deficiency induced a shift of increased citric acid to amino acid synthesis, causing excessive accumulation of amino acids. In addition, the reduced serine level indicated impaired photorespiration. These two changes triggered more serious reduction in photosynthetic capacity. The intimate, changes in photosynthetic capacities were tightly coupled with shifts in central C metabolism, which provides insights into the methods used to enhance A n and plant's adaptability to abiotic stresses, through the regulation of C metabolites using molecular technology.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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