Pollen and Tapetum Development in Desmodium Glutinosum and D. Illinoense (Papilionoideae; Leguminosae)

Abstract

Each of the four microsporangia has three or four wall layers, a uninucleate tapetum of various cell shapes with nuclei that remain in prophase, and 12‐24 pollen mother cells (PMCs). A sterile transverse septum sometimes bisects the microsporangium. PMCs secrete callose but not uniformly, and contact among them continues through meiosis. Simultaneous cytokinesis by furrowing isolates each microspore in callose, which later disperses. The separated microspores become vacuolate, undergo mitosis to become pollen, and later become filled with food reserves. Endothecial wall thickening and tapetal dissolution occur after pollen engorgement. Calcium oxalate crystals form in tapetal cells during the sporogenous stage, reach maximum size during early meiosis, and remain prominent until tapetal dissolution.

Microsporogenesis and exine substructure inUraria crinita(Fabaceae)

“…The anther wall development in the Faboideae was reported as the Dicotyledonous type (Davis 1966, Prakash 1987, including the genera Trifolium (Hindmarsh 1964), Pisum and Lens (Biddle 1978), Indigofera (Ashrafunnisa & Pullaiah 1995), Desmodium (Buss et al 1969). However, in Indigofera and Rhynchosia (Oomman 1971) and the present study of U. crinita, the anther wall consists of an epidermal layer, an endothecium layer, two middle layers and a tapetal layer, it thus belongs to the Basic type (type I), and the same as described by Deshpande (1977).…”

Development of the gametophytes, flower, and floral vasculature in Cochliostema odoratissimum (Commelinaceae)

“…Stejskal-Streit, 1940, and are widespread in Leguminosae (e.g. Buss & Lersten, 1972;Buss, Galen & Lersten, 1969;Tian & Shen, 1991). In several other families (reviewed by D'Arcy, Keating, & Buchmann, 1996), calcium oxalate crystals are often mixed with pollen in dehiscent anthers; however, in these other taxa, the crystals have a non-tapetal origin from a structure unique to these taxa (the 'calcium oxalate package') commonly located beneath the epidermis at the stomium of the anther.…”

A survey of tapetal types and tapetal characteristics in the Leguminosae

“…It more nearly resembled an early prophase nucleus with thin chromatin strands. Buss et al (1969) showed similar tapetal cells in two species of Desmodium, In Vicia faba (Carniel, 1952) the tapetal nuclei contained distinct chromosomes which were like diplochromosomes or quadruple chromosomes resulting from polysomaty.…”

“…In two studies on microsporogenesis in Tradescantia paludosa. Walker (1957) and Walker and Dietrich (1961) Buss et al (1969), who described and showed photographs of small discoid to rhomboid prismatic crystals in two species of Desmodium (Leguminosae).…”