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Genetics and Molecular Biology

Print version ISSN 1415-4757On-line version ISSN 1678-4685


SOUZA, Margarete Magalhães de  and  PEREIRA, Telma Nair Santana. Development of pollen grain in yellow passion-fruit (Passiflora edulis f. flavicarpa; Passifloraceae). Genet. Mol. Biol. [online]. 2000, vol.23, n.2, pp.469-473. ISSN 1678-4685.

To clarify events occurring during pollen grain formation in yellow passion-fruit (Passiflora edulis f. flavicarpa), floral buds were collected at different stages of development. After bracket, petal and sepal removal the anthers were fixed, dehydrated, embedded in paraffin wax, sectioned at 10 mm and after differential dying with safranin O and fast green, mounted in Canada balsam and observed under optical microscope. Formation of the male gamete followed the normal pattern for angiosperms. Observation covered final sporogenic mass phase up to pollen grain formation; microsporangium tissue modifications were also observed. Microsporogenesis was characterized by sporogenic tissue differentiation in microsporic mother cells, followed by meiosis and resulting in tetrads. Microgametogenesis began with callose microspore release, subsequent mitosis, in addition to radial and tangential tapetum wall degradation, parietal layer compression nearer to the tapetum and endothecium widening, terminating in mature pollen grain formation.

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