Developmental Studies with Brassica Seedlings

Shoot Growth and Histogenesis of Trees Possessing Diverse Patterns of Shoot Development

“…This finding, coupled with the previous observations that there is an inherent tendency for all cells of a given tissue to reach the same length at maturity (Havis, 1940;Garrison, 1973;Lam and Brown, 1974;French and Fisher, 1977), explains the high correlation consistently observed between cell number and final internode lengths (Tables 1, 2, 6). The observation that final internode length is causally related to the duration of mitotic activity in developing internodes is not in conflict with the widely held view that growth results directly from increases in cell size and not by cell division per se.…”