Question

how is leaf senescence reversed?

Answer 1

leaf senescence induced by nitrogen starvation may be reversed when nitrogen is resupplied at the onset of senescence

Answer 2

Leaf senescence, the final stage of leaf development, is characterized by a decrease of photosynthetic activity, the degradation of proteins and other macromolecules, and the recycling of the liberated resources of the dying leaf for reuse in other growing parts of the plant, such as newly forming leaves, roots, developing seeds, or fruits