e-journal

The influence of tetrad shape and intersporal callose wall formation on pollen aperture pattern ontogeny in two eudicot species

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Background and Aims In flowering plants, microsporogenesis is accompanied by various types of cytoplasmic
partitioning (cytokinesis). Patterns of male cytokinesis are suspected to play a role in the diversity of aperture patterns found in pollen grains of angiosperms. The relationships between intersporal wall formation, tetrad shape and pollen aperture pattern ontogeny are studied.
Methods A comparative analysis of meiosis and aperture distribution was performed within tetrads in two
triporate eudicot species with contrasting aperture arrangements within their tetrads [Epilobium roseum
(Onagraceae) and Paranomus reflexus (Proteaceae)].
Key Results and Conclusions Intersporal wall formation is a two-step process in both species. Cytokinesis is first achieved by the formation of naked centripetal cell plates. These naked cell plates are then covered by additional thick, localized callose deposits that differ in location between the two species. Apertures are finally formed in areas in which additional callose is deposited on the cell plates. The recorded variation in tetrad shape is correlated with variations in aperture pattern, demonstrating the role of cell partitioning in aperture pattern ontogeny.
Key words: Microsporogenesis, tetrad shape; aperture, callose, Epilobium roseum, Paranomus reflexus.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

: Oxford University Press on behalf of the Annals of Botany Company., 2010

Deskripsi Fisik

Annals of Botany 106: 557–564, 2010

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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