(1) The relative volume of mitochondria, their number per unit of cytoplasm volume and total length of membranes suffer relatively insignificant changes during the vegetative phase and increase markedly during the prefloral phase when the apex is preparing itself for generative differentiation.
Vernation
Definition:
(n.) The arrangement of the leaves within the leaf bud, as regards their folding, coiling, rolling, etc.; prefoliation.