Triggered by shortening days and cooling weather, a layer of corklike cells builds up at the base of the leaf stem and halts the flow of nutrients between the leaf and the plant.
(a layer of corklike cells; builds up; L:at the base of the leaf stem) (a layer of corklike cells; halts; the flow of nutrients between the leaf and the plant)
a layer of corklike cells a layer of corklike cells
builds up halts
L:at the base of the leaf stem
the flow of nutrients between the leaf and the plant