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Annals of Botany 48: 769-775, 1981
© 1981 Annals of Botany Company

RESEARCH-ARTICLE

An Early Cytochemical Marker of Commitment to Stelar Differentiation in Meristems from Dicotyledonous Plants

P. B. GAHAN

Biology Department, Queen Elizabeth College, University of London Campden Hill Road, London W8 7AH

Accepted: 6 March 1981   

A cytochemical study of root apices from Vicia faba and Pisum sativum showed esterase activity to be present in the stele, root cap and rhizodermis, but almost completely absent from the developing cortex and quiescent centres. The meristem cells giving rise to the cortex were almost negative whilst those giving rise to the stele were positive for esterase activity. Cambia from roots, shoots and petioles of a number of dicotyledonous species were all positive for esterase activity. It is proposed that esterase activity may be used as an early marker of commitment to differentiation into stele in roots of dicotyledonous plants, and that the cambia are fully committed meristems.

Pisum sativum L., Vicia fabaL., garden pea, broad bean, meristems, stelar differentiation, esterase activity, xylem differentiation, cytochemistry, cambium


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