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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.

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