Diel magnesium fluctuations in chloroplasts contribute to photosynthesis in rice
Autor: | Hong Liao, Sheng Liu, Xin-Guang Zhu, Kengo Yokosho, Naoki Yamaji, Hong Rui Cao, Jian Li, Jian Feng Ma, Zhi Chang Chen |
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Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
0301 basic medicine Chloroplasts Ribulose-Bisphosphate Carboxylase Plant Science Photosynthetic efficiency Photosynthesis 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Magnesium Cation Transport Proteins Diel vertical migration Plant Proteins Oryza sativa Ribulose food and beverages Oryza Assimilation (biology) Circadian Rhythm Pyruvate carboxylase Plant Leaves Chloroplast 030104 developmental biology chemistry Biophysics 010606 plant biology & botany |
Zdroj: | Nature Plants. 6:848-859 |
ISSN: | 2055-0278 |
Popis: | Photosynthesis provides food, fibre and fuel that support our society; understanding the mechanisms controlling dynamic changes in this process helps identify new options to improve photosynthesis. Photosynthesis shows diel changes, which have been largely attributed to external light/dark conditions, as well as internal gene expression and the post-translational modification of critical enzymes. Here we report diel fluctuations of magnesium (Mg) in rice (Oryza sativa) chloroplasts, which may function as a rhythm regulator contributing to the post-translational regulation of photosynthetic CO2 assimilation in rice. We found that a chloroplast-localized Mg2+ transporter gene, OsMGT3, which is rhythmically expressed in leaf mesophyll cells, partly modulates Mg fluctuations in rice chloroplasts. Knockout of OsMGT3 substantially reduced Mg2+ uptake, as well as the amplitude of free Mg2+ fluctuations in chloroplasts, which was closely associated with a decrease in ribulose 1,5-bisphosphate carboxylase activity in vivo and a consequent decline in the photosynthetic rate. In addition, the mesophyll-specific overexpression of OsMGT3 remarkably improved photosynthetic efficiency and growth performance in rice. Taken together, these observations demonstrate that OsMGT3-dependent diel Mg fluctuations in chloroplasts may contribute to Mg-dependent enzyme activities for photosynthesis over the daily cycle. Enhancing Mg2+ input to chloroplasts could be a potential approach to improving photosynthetic efficiency in plants. |
Databáze: | OpenAIRE |
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