Light quality regulates plant biomass and fruit quality through a photoreceptor-dependent HY5-LHC/CYCB module in tomato

作者：Jiarong Yan, Juan Liu, Shengdie Yang, Chenghao Jiang, Yanan Liu, Nan Zhang, Xin Sun, Ying Zhang, Kangyou Zhu, Yinxia Peng, Xin Bu, Xiu‐Jie Wang, Golam Jalal Ahammed, Sida Meng, Changhua Tan, Yufeng Liu, Zhouping Sun, Mingfang Qi, Feng Wang, Tianlai Li · 发表于：Horticulture Research · 年份：2023 · DOI：10.1093/hr/uhad219 · 被引用次数：40 · 研究领域：Light effects on plants、Photosynthetic Processes and Mechanisms、Plant Molecular Biology Research

Abstract Increasing photosynthesis and light capture offers possibilities for improving crop yield and provides a sustainable way to meet the increasing global demand for food. However, the poor light transmittance of transparent plastic films and shade avoidance at high planting density seriously reduce photosynthesis and alter fruit quality in vegetable crops, and therefore it is important to investigate the mechanisms of light signaling regulation of photosynthesis and metabolism in tomato (Solanum lycopersicum). Here, a combination of red, blue, and white (R1W1B0.5) light promoted the accumulation of chlorophyll, carotenoid, and anthocyanin, and enhanced photosynthesis and electron transport rates by increasing the density of active reaction centers and the expression of the genes LIGHT-HARVESTING COMPLEX B (SlLHCB) and A (SlLHCA), resulting in increased plant biomass. In addition, R1W1B0.5 light induced carotenoid accumulation and fruit ripening by decreasing the expression of LYCOPENE β-CYCLASE (SlCYCB). Disruption of SlCYCB largely induced fruit lycopene accumulation, and reduced chlorophyll content and photosynthesis in leaves under red, blue, and white light. Molecular studies showed that ELONGATED HYPOCOTYL 5 (SlHY5) directly activated SlCYCB, SlLHCB, and SlLHCA expression to enhance chlorophyll accumulation and photosynthesis. Furthermore, R1W1B0.5 light-induced chlorophyll accumulation, photosynthesis, and SlHY5 expression were largely decreased in the slphyb1cry1...