Strigolactone-induced senescence of a bamboo leaf in the dark is alleviated by exogenous sugar

Strigolactones (SLs) are a series of sesquiterpene lactones that serve as plant hormones to regulate plant growth and development, such as shoot branching, lateral root formation, and root hair elongation. Recently, SLs have been reported to accelerate the leaf senescence, which is also regulated by sugar signals. In this study, we utilized segments of a bamboo leaf to observe leaf senescence and confirmed that SL accelerates leaf senescence and triggers cell death under a dark condition rather than under a light condition. Further studies showed that the co-treatment of sugars suppressed SL-induced leaf senescence and cell death under dark conditions, suggesting a crosstalk between SL and the sugar signal in regulating leaf senescence.