Spatiotemporal features of microsporogenesis in the cycad species <i>Macrozamia communis</i>

Yan, Xiaodong; Bai, Mei; Ning, Xiping; Hai-Bo, Ouyang; Zhang, Shouzhou; Yang, Ming; Wu, Hong

doi:10.3732/ajb.1500112

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…Meanwhile, simultaneous cytokinesis with centripetal callose deposition is predominant in eudicots and is usually associated with tetrahedral, or rarely with rhomboidal, tetrads [15,16]. Intermediate cytokinesis is rare and has only been reported in some cycads and magnolias [17][18][19][20][21]. The cytokinesis type and the tetrad shape are relatively conserved in monocots and eudicots; therefore, the cytokinesis type can usually be inferred from the tetrad shape [6].…”

Section: Introductionmentioning

confidence: 99%

Ontogeny of Different Tetrad Types in the Single Microsporangium of Mitrephora tomentosa (Annonaceae)

Li,

Liu,

Cheng

et al. 2023

Diversity

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Annonaceae, comprising approximately 107 genera and 2400 species, is the largest family among early-divergent Magnoliales. Previous studies have concentrated on the binding mechanism that holds together the four members of tetrads in Annonaceae. However, the development mechanisms of different tetrad types remain largely unknown. Mitrephora tomentosa was found to exhibit five permanent tetrad types, with two or three of them existing in the same microsporangium, which is ideal for studying the formation mechanisms of different permanent tetrad pollens in a single microsporangium and explaining the relationship between cytokinesis and pollen tetrad types. The ontogenetic development of the different tetrads in M. tomentosa was investigated using electron microscopy technologies, histochemical staining, and immunocytochemistry. During meiosis, pollen mother cells produce decussate and tetragonal tetrads by successive cytokinesis and produce tetrahedral and rhomboidal tetrads by simultaneous cytokinesis. Bidirectional callose deposition was observed in tetrahedral, tetragonal, rhomboidal, and decussate tetrads. The variations in the process of microsporogenesis randomly accumulate and manifest as different combinations of cytokinesis and callose deposition, leading to the formation of differently shaped tetrads. In mature permanent tetrad pollens, four microspores are connected by both simple cohesion and cytoplasmic channels, which also play an important role in maintaining the synchronization of the tetrad members.

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Section: Introductionmentioning

confidence: 99%

Ontogeny of Different Tetrad Types in the Single Microsporangium of Mitrephora tomentosa (Annonaceae)

Li,

Liu,

Cheng

et al. 2023

Diversity

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Cell polarity, asynchronous nuclear divisions, and bidirectional cytokinesis in male meiosis in Magnolia denudata

Bai

Yang

et al. 2021

Protoplasma

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Spatiotemporal features of microsporogenesis in the cycad species Macrozamia communis

Abstract: Cytokinesis at the cell periphery is initiated earlier than cell plate formation in the cell interior in microsporogenesis in M. communis. The cellular features uncovered in M. communis may serve as useful reference features for comparative studies of microsporogenesis in plants.

Cited by 2 publications

References 37 publications

Ontogeny of Different Tetrad Types in the Single Microsporangium of Mitrephora tomentosa (Annonaceae)

Ontogeny of Different Tetrad Types in the Single Microsporangium of Mitrephora tomentosa (Annonaceae)

Cell polarity, asynchronous nuclear divisions, and bidirectional cytokinesis in male meiosis in Magnolia denudata

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