Asynchronous meiosis in an interspecific hybrid of Brachiaria ruziziensis and B. brizantha

Male meiosis is generally synchronous in higher plants. The regulation of the cell cycle is still not well understood, and a powerful tool for gaining an understanding of this regulation is the development of mutations that affect cell-cycle synchrony. We report here asynchronous microsporogenesis i...

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Bibliographic Details
Published in:Plant cell reports 2004-11, Vol.23 (5), p.304-310
Main Authors: Risso-Pascotto, C, Pagliarini, M.S, Valle, C.B. do, Jank, L
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biotechnology
Brachiaria - cytology
Brachiaria - genetics
Brachiaria - growth & development
Brachiaria brizantha
Brachiaria ruziziensis
Cell cycle
Chimera
Eukaryotic cell cultures
Fertility
Fundamental and applied biological sciences. Psychology
Genetics
grasses
interspecific hybridization
meiosis
Meiosis - physiology
Methods. Procedures. Technologies
microspores
microsporogenesis
Miscellaneous
Plant cells and fungal cells
plant fertility
Pollen
Pollen - cytology
Pollen - growth & development
Pollen - physiology
Prophase - physiology
Urochloa brizantha
Urochloa ruziziensis
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Summary:Male meiosis is generally synchronous in higher plants. The regulation of the cell cycle is still not well understood, and a powerful tool for gaining an understanding of this regulation is the development of mutations that affect cell-cycle synchrony. We report here asynchronous microsporogenesis in an interspecific hybrid between two important tropical grasses. In young spikelets of the interspecific hybrid 49.10% of anther meiocytes entered meiosis, exhibiting typical phases of the first and second divisions, while the other 50.90% showed distinctive features of early prophase. In older spikelets, anthers containing mature pollen grains also displayed meiocytes still undergoing meiosis. At this time, the latter cells were enclosed by the exine wall. Despite asynchrony, all cells completed meiosis. Old anthers contained only pollen grains that appeared to be in the same stage of development. Pollen fertility was estimated to be 52.76% in dehiscent anthers. An independent genetic control for meiosis synchrony and meiotic stages is suggested.
ISSN:0721-7714
1432-203X
DOI:10.1007/s00299-004-0802-2