COMPARISON OF DETERMINED AND UNDETERMINED MERISTEMS OF SELAGINELLA-WILLDENOVII BAKER

  • 1 January 1978
    • journal article
    • research article
    • Vol. 21  (82) , 103-111
Abstract
Three types of meristems from S. willdenovii were compared. Undetermined dorsal branch junction meristems were aseptically cultured for 0, 1, 3, 5 and 7 days on Knop''s medium prior to fixation. Root tips and shoot tips, which have meristems already determined developmentally, were excised from intact plants and fixed immediately. The cellular ultrastructure of each meristem was studied showing some differences in chloroplast structure, microtubule deposition, vesicle of formation, degree of vacuolation and invaginations of the plasma membrane. Some of these features, e.g., microtubule deposition and vesicle formation and vacuolation could be attributed to the different developmental states of the meristems.