Abstract
Leaf senescence is a complicated developmental process that involves degenerative changes and nutrient recycling. The progress of leaf senescence is controlled by various environmental cues and plant hormones, including ethylene, jasmonic acid, salicylic acid, abscisic acid, cytokinins, and strigolactones. The production of strigolactones is induced in response to nitrogen and phosphorous deficiency. Strigolactones also accelerate leaf senescence and regulate shoot branching and root architecture. Leaf senescence is actively promoted in a nutrient-poor soil environment, and nutrients are transported from old leaves to young tissues and seeds. Strigolactones might act as important signals in response to nutrient levels in the rhizosphere. In this review, we discuss the possible roles of strigolactones during leaf senescence.
Highlights
Leaf senescence is an essential process observed in the final stage of leaf development [1]
Leaf cells accumulate ribulose bisphosphate carboxylase, chlorophyll-a/b binding protein (CAB), and other proteins involved in photosynthesis in the chloroplast, which contains more than 70% of the total leaf protein [2]
The most important change is chloroplast breakdown, which is accompanied by chlorophyll degradation and progressive loss of chloroplast proteins, such as rubisco and CAB, and which causes leaf color changes from green to yellow
Summary
Leaf senescence is an essential process observed in the final stage of leaf development [1]. Plant hormones act as internal cues that influence plant development and responses to environmental stresses, and play an important role in the regulation of leaf senescence. Jasmonic acid, salicylic acid, and abscisic acid act as positive regulators in leaf senescence, whereas cytokinins are potent inhibitors of leaf senescence [7]. In addition to these hormones, strigolactones (SLs, a class of plant hormones) appear to regulate leaf senescence because some SL-deficient and SL-insensitive mutants show delayed leaf senescence [8,9,10,11]. We discuss the physiological roles of SLs in leaf senescence
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