Overexpression of microRNA408 enhances photosynthesis, growth, and seed yield in diverse plants
文献类型： 外文期刊
作者： Pan, Jiawei 2 ; Huang, Dahui 3 ; Guo, Zhonglong 1 ; Kuang, Zheng 1 ; Zhang, He 1 ; Xie, Xinyu 1 ; Ma, Zengfeng 3 ; Gao, S 1 ;
作者机构： 1.Peking Univ, State Key Lab Prot & Plant Gene Res, Peking Tsinghua Ctr Life Sci, Sch Life Sci, Beijing 100871, Peoples R China
2.Peking Univ, Sch Adv Agr Sci, Beijing 100871, Peoples R China
3.Guangxi Acad Agr Sci, Rice Res Inst, Nanning 530007, Peoples R China
4.Chinese Acad Sci, State Key Lab Plant Genom, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Natl Ctr Plant Gene Res Beijing, Inst Genet & Dev Biol, Beijing 100101, Peoples R China
6.Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA
期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）
ISSN： 1672-9072
年卷期： 2018 年 60 卷 4 期
页码：
收录情况： SCI
摘要： The ability of a plant to produce grain, fruit, or forage depends ultimately on photosynthesis. There have been few attempts, however, to study microRNAs, which are a class of endogenous small RNAs post-transcriptionally programming gene expression, in relation to photosynthetic traits. We focused on miR408, one of the most conserved plant miRNAs, and overexpressed it in parallel in Arabidopsis, tobacco, and rice. The transgenic plants all exhibited increased copper content in the chloroplast, elevated abundance of plastocyanin, and an induction of photosynthetic genes. By means of gas exchange and optical spectroscopy analyses, we showed that higher expression of miR408 leads to enhanced photosynthesis through improving efficiency of irradiation utilization and the capacity for carbon dioxide fixation. Consequently, miR408 hyper-accumulating plants exhibited higher rate of vegetative growth. An enlargement of seed size was also observed in all three species overproducing miR408. Moreover, we conducted a 2-year-two-location field trial and observed miR408 overexpression in rice significantly increased yield, which was primarily attributed to an elevation in grain weight. Taken together, these results demonstrate that miR408 is a positive regulator of photosynthesis and that its genetic engineering is a promising route for enhancing photosynthetic performance and yield in diverse plants.
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