9.B.463.  The Leaf Senescence Related (LSR) Family 

Senescence is the final stage in the life history of a leaf, whereby plants relocate nutrients from leaves to other developing organs. The network-based molecular mechanism that incorporates various environmental signals with leaf age, and involves a complex process with the coordinated actions of multiple pathways. Feng et al. 2022 identified a novel participant, named LSR1 (Leaf Senescence Related 1), that is involved in the regulation of leaf senescence. A loss-of-function lsr1-1 mutant showed delayed leaf senescence whereas the overexpression of LSR1 accelerated senescence. LSR1 encodes a lipid transfer protein, and the protein is located in chloroplast and intercellular space. LSR1 may be involved in the regulation of leaf senescence by transporting lipids in plants (Feng et al. 2022).