Functional modulation of an aquaporin to intensify photosynthesis and abrogate bacterial virulence in rice
文献类型： 外文期刊
作者： Chen, Xiaochen 1 ; Ma, Jinbiao 1 ; Wang, Xuan 2 ; Lu, Kai 3 ; Liu, Yan 1 ; Zhang, Liyuan 3 ; Peng, Jinfeng 1 ; Chen, Lei; 1 ;
作者机构： 1.Nanjing Agr Univ, Dept Plant Pathol, Nanjing, Jiangsu, Peoples R China
2.Nanjing Univ, Sch Life Sci, Inst Plant Mol Biol, Dept Biol,State Key Lab Pharmaceut Biotechnol, Nanjing, Jiangsu, Peoples R China
3.Shandong Agr Univ, Coll Plant Protect, Tai An, Shandong, Peoples R China
4.State Key Lab Crop Biol, Tai An, Shandong, Peoples R China
5.Yunnan Acad Agr Sci, Biotechnol & Genet Resources Inst, Kunming, Yunnan, Peoples R China
关键词： aquaporin; OsPIP1; 3; CO2 transport; photosynthesis; grain yield; functional switch; bacterial effectors; translocation; disease control
期刊名称：PLANT JOURNAL （ 影响因子：6.486； 五年影响因子：7.666 ）
ISSN： 0960-7412
年卷期： 2021 年 108 卷 2 期
页码：
收录情况： SCI
摘要： Plant aquaporins are a recently noted biological resource with a great potential to improve crop growth and defense traits. Here, we report the functional modulation of the rice (Oryza sativa) aquaporin OsPIP1;3 to enhance rice photosynthesis and grain production and to control bacterial blight and leaf streak, the most devastating worldwide bacterial diseases in the crop. We characterize OsPIP1;3 as a physiologically relevant CO2-transporting facilitator, which supports 30% of rice photosynthesis on average. This role is nullified by interaction of OsPIP1;3 with the bacterial protein Hpa1, an essential component of the Type III translocon that supports translocation of the bacterial Type III effectors PthXo1 and TALi into rice cells to induce leaf blight and streak, respectively. Hpa1 binding shifts OsPIP1;3 from CO2 transport to effector translocation, aggravates bacterial virulence, and blocks rice photosynthesis. On the contrary, the external application of isolated Hpa1 to rice plants effectively prevents OsPIP1;3 from interaction with Hpa1 secreted by the bacteria that are infecting the plants. Blockage of the OsPIP1;3-Hpa1 interaction reverts OsPIP1;3 from effector translocation to CO2 transport, abrogates bacterial virulence, and meanwhile induces defense responses in rice. These beneficial effects can combine to enhance photosynthesis by 29-30%, reduce bacterial disease by 58-75%, and increase grain yield by 11-34% in different rice varieties investigated in small-scale field trials conducted during the past years. Our results suggest that crop productivity and immunity can be coordinated by modulating the physiological and pathological functions of a single aquaporin to break the growth-defense tradeoff barrier.
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