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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

The role of ascorbic acid in rice leaf senescence and photo–carbon imbalance

Le Yu https://orcid.org/0000-0002-8139-3488 A B , Qilei Zhang A , Lina Lu A , Hui Gao A , Qiang Liu A , Yonghai Liu B , Chengwei Yang A and Changlian Peng A C
+ Author Affiliations
- Author Affiliations

A Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Sciences, South China Normal University, 510631, Guangzhou, China.

B College of Life Sciences, Zhaoqing University, Zhaoqing, 526061, China.

C Corresponding author. Email: pengchl@scib.ac.cn

Functional Plant Biology 47(3) 263-278 https://doi.org/10.1071/FP19248
Submitted: 23 August 2019  Accepted: 18 November 2019   Published: 7 February 2020

Abstract

Leaf senescence is an important factor that affects crop yield traits and is regulated by various factors. Here, we propose the photo–carbon imbalance hypothesis to explain the mechanism of rice leaf senescence. The main idea of this hypothesis is that carbon assimilation decreases faster than the absorption of light energy in photosynthesis during the late stages of rice growth, which ultimately results in leaf senescence. Our results indicate that endogenous ascorbic acid (Asc) plays an important role in leaf senescence by affecting the expression of senescence genes, thereby influencing photosynthetic capacity and consequently grain yield. The effects of exogenous Asc and methyl jasmonate (MeJA) on photosynthetic capability implied that the balance between photoreaction and carbon assimilation is regulated by exogenous antioxidants or accelerators of senescence. The results of the shading treatments indicated that shading will mitigate the photo–carbon imbalance and improve photosynthetic capacity, resulting in increased yields. Increasing antioxidant concentrations can enhance the reactive oxygen species (ROS) scavenging capacity, whereas shading reduces excess light energy, which may help to restore the photo–carbon balance.

Additional keywords: ascorbic acid, photosynthesis, senescence, yield.


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