Maize GOLDEN2-LIKE genes enhance biomass and grain yields in rice by improving photosynthesis and reducing photoinhibition
Maize GOLDEN2-LIKE genes enhance biomass and grain yields in rice by improving photosynthesis and reducing photoinhibition
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玉米GOLDEN2-LIKE基因通过改善光合作用和减少光抑制来提高水稻的生物量和谷物产量
DOI：
10.1038/s42003-020-0887-3
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发表时间：
2020-04-01
影响因子：
5.9
通讯作者：
Zhou, Wenbin
中科院分区：
文献类型：
--
作者：
Li, Xia;Wang, Peng;Zhou, Wenbin
在农业田间条件下，光合效率是提高作物产量潜力的主要指标。光合作用过程的许多步骤都可能发生效率低下，从叶绿体的生物发生到光收集和碳固定反应的功能。核编码的GOLDEN2-LIKE （GLK）转录因子通过激活编码叶绿体定位蛋白和光合作用相关蛋白的靶基因来调控一些最早的步骤。本研究表明，玉米GLK基因在水稻中的组成性表达导致叶绿素和色素-蛋白天线复合物水平的提高，这些增加导致大田作物通过光系统II提高光收获效率。增加的叶黄素水平进一步缓冲了在强光或波动光条件下的光抑制的负面影响，促进了多余吸收能量作为热量的更大耗散。值得注意的是，田间种植转基因植株的光合能力增强导致碳水化合物水平增加，营养生物量和籽粒产量均增加30-40%。
Photosynthetic efficiency is a major target for improvement of crop yield potential under agricultural field conditions. Inefficiencies can occur in many steps of the photosynthetic process, from chloroplast biogenesis to functioning of the light harvesting and carbon fixation reactions. Nuclear-encoded GOLDEN2-LIKE (GLK) transcription factors regulate some of the earliest steps by activating target genes encoding chloroplast-localized and photosynthesis-related proteins. Here we show that constitutive expression of maize GLK genes in rice leads to enhanced levels of chlorophylls and pigment-protein antenna complexes, and that these increases lead to improved light harvesting efficiency via photosystem II in field-grown plants. Increased levels of xanthophylls further buffer the negative effects of photoinhibition under high or fluctuating light conditions by facilitating greater dissipation of excess absorbed energy as heat. Significantly, the enhanced photosynthetic capacity of field-grown transgenic plants resulted in increased carbohydrate levels and a 30–40% increase in both vegetative biomass and grain yield.