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Article|16 Nov 2023|OPEN
Light quality regulates plant biomass and fruit quality through a photoreceptor-dependent HY5-LHC/CYCB module in tomato 
Jiarong Yan1 , Juan Liu1 , Shengdie Yang1 , Chenghao Jiang1 , Yanan Liu1 , Nan Zhang1 , Xin Sun2 , Ying Zhang1 , Kangyou Zhu1 , Yinxia Peng1 , Xin Bu1 , Xiujie Wang1 , Golam Jalal Ahammed3,4 , Sida Meng1 , Changhua Tan1 , Yufeng Liu1 , Zhouping Sun1 , Mingfang Qi1 and Feng Wang1,5 , , Tianlai Li,1,5 ,
1College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China
2College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
3College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471023, China
4Henan International Joint Laboratory of Stress Resistance Regulation and Safe Production of Protected Vegetables, Luoyang, 471023, China
5Key Laboratory of Protected Horticulture, Ministry of Education, Shenyang 110866, China
*Corresponding author. E-mail: fengwang@syau.edu.cn,tianlaili@126.com

Horticulture Research 11,
Article number: uhad219 (2024)
doi: https://doi.org/10.1093/hr/uhad219
Views: 40

Received: 28 May 2023
Accepted: 19 Oct 2023
Published online: 16 Nov 2023

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 SlCYCBSlLHCB, 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 mutant. Collectively, R1W1B0.5 light noticeably promoted photosynthesis, biomass, and fruit quality through the photoreceptor (SlPHYB1 and SlCRY1)-SlHY5-SlLHCA/B/SlCYCB module in tomato. Thus, the manipulation of light environments in protected agriculture is a crucial tool to regulate the two vital agronomic traits related to crop production efficiency and fruit nutritional quality in tomato.