Senescence: Regulation and Signalling

Dar, Riyaz Ahmad; Tahir, Inayatullah; Ahmad, Shafeeque

doi:10.1007/978-81-322-1542-4_13

Cited by 1 publication

(1 citation statement)

References 55 publications

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“…Unfavorable environmental conditions such as drought, salinity, extreme temperatures, pathogen attack, and soil nutrient limitation influence the senescence rate of leaves. Additionally, plant hormones control leaf senescence either positively or negatively [4,5]. Ethylene, jasmonates, and abscisic acid accelerate this process and, among these, ethylene is considered a key plant hormone in promoting leaf senescence [6,7].…”

Section: Introductionmentioning

confidence: 99%

Counteractive Effects of Sugar and Strigolactone on Leaf Senescence of Rice in Darkness

2021

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Plant hormones strigolactones (SLs) were recently reported to induce leaf senescence. It was reported that sugar suppresses SL-induced leaf senescence in the dark; however, the mechanism of the crosstalk between SLs and the sugar signal in leaf senescence remains elusive. To understand this mechanism, we studied the effects of glucose (Glc) on various senescence-related parameters in leaves of the rice. We found that sugars alleviated SL-induced leaf senescence under dark conditions, and the co-treatment with Glc suppressed SL-induced hydrogen peroxide generation and membrane deterioration. It also suppressed the expression levels of antioxidant enzyme genes upregulated by SL, suggesting that Glc alleviates SL-induced senescence by inhibiting the oxidative processes. SLs can adapt to nutrient deficiency, a major factor of leaf senescence; therefore, we suggest the possibility that Glc and SL monitor the nutrient status in plants to regulate leaf senescence.

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