Author:
Jain S.,Pillai A.,Goyal S. C.
Abstract
SummaryGermination is epigeal. The primary root is tetrarch in Carissa, Nerium and Wrightia and hexarch in Thevetia. The absence of rotation in the xylem during transition and the gradual disappearance of root protoxylem support Bonnier’s (1900 a, b) view of the gradual inward shifting of the pole of xylem differentiation. The root‐hypocotyl‐cotyledonary vasculature and epicotyl vasculature are ontogenetically separate units. The cotyledonary node is unilacunar unitrace in Carissa, Nerium and Thevetia and unilacunar two‐trace in Wrightia. The cotyledonary vasculature seems to support Bailey’s (1956) suggestion of the unilacunar two‐trace as a primitive condition.
Reference16 articles.
1. Nodal Anatomy in Retrospect
2. On the ontogeny of the teratological seedlings. I. Cosmos bipinnatus Cav. Proc. Indian Aeedlngs. I. Cosmos bipinnatus Cav;Banerji M. L.;Proc. Indian Acad. Sci.,1961
3. Sur l’order de. formation des elements, du cylindre central dans la. racine.et la tige;Bonnier G.;Comp. rend. hebd. Séance, Acad. Sci., Paris,1900
4. Sur la differentiation de tissue vascularaise de la feuille et de la tige;Bonnier G.;Comp. rend. hebd. Séane. Acad. Sci., Paris,1900