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Ontogenetic development of pollen tetrads in Vaccinium smallii A. Gray (Ericaceae)

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/55508

Title: Ontogenetic development of pollen tetrads in Vaccinium smallii A. Gray (Ericaceae)
Other Titles: オオバスノキ(ツツジ科)における四集粒花粉の個体発生
Authors: Sarwar, A.K.M. Golam1 Browse this author
Ito, Toshiaki2 Browse this author
Takahashi, Hideki3 Browse this author →KAKEN DB
Authors(alt): サルワル, A.K.M.ゴラム1
伊藤, 利章2
高橋, 英樹3
Keywords: binding mechanism
ontogeny
pollen tetrads
primexine
Vaccinium
Issue Date: 31-Dec-2012
Publisher: 日本花粉学会
Journal Title: 日本花粉学会会誌
Journal Title(alt): Japanese journal of palynology
Volume: 58
Issue: 2
Start Page: 61
End Page: 71
Abstract: The ontogenetic development of pollen tetrads in Vaccinium smallii was investigated by light and transmission electron microscopy with special attention to the mode of exine deposition. The deposition of the primexine matrix represented by a fibrillar surface coat started during the cytokinesis of the microspore mother cell within a thick callose wall. The deposition of dark lipoidal globules of sporopollenin precursor substances was observed within the primexine matrix. After the disappearance of these globules, radially directed pro-columellae appeared within the primexine matrix, and the primexine gives rise to the tectum, columellae and foot layer after the callose dissolution. The position of future apertures was observed at a thick zone and/or a thin layer of the primexine matrix. In both regions, the pro-columellae, protectum and foot layer were not formed. Major binding mechanism of the permanent mature pollen tetrads in V. smallii is attributed to 1) the early deposition of the primexine matrix on the microspore mother cell undergoing cytokinesis, and 2) thin and tenuous callose depositions, 3) the common primexine matrix, and 4) the cytoplasmic channels between the adjoining microspores of the meiotic tetrad within a thick callose wall.
Type: article (author version)
URI: http://hdl.handle.net/2115/55508
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Sarwar, A.K.M. Golam

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