Developmental anatomy of Ranales. III apical organisation and dormancy in roots

Abstract

Root apical organisation inAnnona squamosa, Artabotrys odoratissimus,Polyalthia longifolia, Nigella sativa, Ranunculus sceleratus, Clematis triloba andMichelia champaca falls into two types: Type I—Annona,Artabotrys, Polyalthia,Michelia andNigella, show a common group of initials around which the derivatives differentiate into the root cap, epidermis, cortex and central cylinder. Type II—Ranunculus andClematis, show discrete initials for the plerome, periblem, dermocalyptrogen and columella. The arboreal species investigated show a common group of initials and the herbaceous ones (exceptNigella) discrete initials at the root apex. This may be of phylogenetic significance.