期刊
NEW PHYTOLOGIST
卷 232, 期 6, 页码 2324-2338出版社
WILEY
DOI: 10.1111/nph.17730
关键词
CO2 assimilation; d1; drought; heterotrimeric G protein; mesophyll conductance; Oryza sativa; stomatal conductance
资金
- BARD, the United States-Israel Binational Agricultural Research and Development Fund [FI-578-2018]
- Agriculture and Food Research Initiative competitive grant of the US Department of Agriculture's National Institute of Food and Agriculture [2018-06502]
Mesophyll conductance g(m) plays a crucial role in determining photosynthesis in plants. Increasing g(m) can improve photosynthesis and intrinsic water use efficiency. Manipulation of heterotrimeric G protein signaling shows potential in enhancing crop drought tolerance and productivity.
Mesophyll conductance g(m) determines CO2 diffusion rates from mesophyll intercellular air spaces to the chloroplasts and is an important factor limiting photosynthesis. Increasing g(m) in cultivated plants is a potential strategy to increase photosynthesis and intrinsic water use efficiency (WUEi). The anatomy of the leaf and metabolic factors such as aquaporins and carbonic anhydrases have been identified as important determinants of g(m). However, genes involved in the regulation and modulation of g(m) remain largely unknown. In this work, we investigated the role of heterotrimeric G proteins in g(m) and drought tolerance in rice d1 mutants, which harbor a null mutation in the G alpha subunit gene, RGA1. d1 mutants in both cv Nipponbare and cv Taichung 65 exhibited increased g(m), fostering improvement in photosynthesis, WUEi, and drought tolerance compared with wild-type. The increased surface area of mesophyll cells and chloroplasts exposed to intercellular airspaces and the reduced cell wall and chloroplast thickness in the d1 mutant are evident contributors to the increase in g(m). Our results indicate that manipulation of heterotrimeric G protein signaling has the potential to improve crop WUEi and productivity under drought.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据