TRICHOME MORPHOGENESIS ON LEAVES OF CYPHOMANDRA BETACEA SENDT. (SOLANACEAE)

Abstract

ABSTRACT The trichome tissue on leaves of Cyphomandra betacea Sendt. consists of a simple nonglandular form and two glandular trichomes, short-stiped and long-stiped forms, distinguished by their morphology and development. These types, which occur on both leaf surfaces, can be distinguished from each other upon enlargement of the trichome initial following its inception from the protoderm cells. The nonglandular form consists of a uniseriate filament of typically four to six cells. Glandular trichomes consist of a stipe composed of a stipe cell and neck cell which are surmounted by a glandular head consisting of four cells. Differential enlargement of the stipe cell, whether at the proximal region or distal region, leads to the development of the long-stiped and short-stiped gland, respectively. The long-stiped gland, unlike the short-stiped form, possesses a dehiscence mechanism whereby the glandular head abscisses from the stipe at a specialized site of weakness between the neck cell and the gland head...