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Lee, Sichul
식물 노화·수명 연구단
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Current understanding of leaf senescence in rice

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Title
Current understanding of leaf senescence in rice
Author(s)
Sichul Lee; Celine Masclaux-Daubresse
Publication Date
2021-05
Journal
International Journal of Molecular Sciences, v.22, no.9
Publisher
MDPI AG
Abstract
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Leaf senescence, which is the last developmental phase of plant growth, is controlled by multiple genetic and environmental factors. Leaf yellowing is a visual indicator of senescence due to the loss of the green pigment chlorophyll. During senescence, the methodical disassembly of macromolecules occurs, facilitating nutrient recycling and translocation from the sink to the source organs, which is critical for plant fitness and productivity. Leaf senescence is a complex and tightly regulated process, with coordinated actions of multiple pathways, responding to a sophisticated integration of leaf age and various environmental signals. Many studies have been carried out to understand the leaf senescence-associated molecular mechanisms including the chlorophyll break-down, phytohormonal and transcriptional regulation, interaction with environmental signals, and associated metabolic changes. The metabolic reprogramming and nutrient recycling occurring during leaf senescence highlight the fundamental role of this developmental stage for the nutrient economy at the whole plant level. The strong impact of the senescence-associated nutrient remobilization on cereal productivity and grain quality is of interest in many breeding programs. This review summa-rizes our current knowledge in rice on (i) the actors of chlorophyll degradation, (ii) the identification of stay-green genotypes, (iii) the identification of transcription factors involved in the regulation of leaf senescence, (iv) the roles of leaf-senescence-associated nitrogen enzymes on plant performance, and (v) stress-induced senescence. Compiling the different advances obtained on rice leaf senescence will provide a framework for future rice breeding strategies to improve grain yield.
URI
https://pr.ibs.re.kr/handle/8788114/10091
DOI
10.3390/ijms22094515
ISSN
1661-6596
Appears in Collections:
Center for Plant Aging Research (식물 노화·수명 연구단) > 1. Journal Papers (저널논문)
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