Reproductive behavior of Pennisetum macrostachyum Benth., and a new basic chromosome number in the genus Pennisetum

Pennisetum macrostachyum Benth, is a tetraploid (2n = 68), with a new basic chromosome number n = 17. Microspoiogenesis is normal and 34 bivalents are formed regularly during diakinesis. Meiotic I and II divisions, being normal, lead to the formation of a tetrad of four cells with 97% viable pollen....

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Bibliographic Details
Published in:Bulletin of the Torrey Botanical Club 1979-04, Vol.106 (2), p.73-78
Main Author: Shanthamma, C.
Format: Article
Language:English
Subjects:
Apomixis
Cell nucleus
Diploidy
Embryos
Megaspores
Megasporocytes
Microsporocytes
Mother cells
Ploidies
Polyploidy
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Summary:Pennisetum macrostachyum Benth, is a tetraploid (2n = 68), with a new basic chromosome number n = 17. Microspoiogenesis is normal and 34 bivalents are formed regularly during diakinesis. Meiotic I and II divisions, being normal, lead to the formation of a tetrad of four cells with 97% viable pollen. The hypodermal aichesporial cell functions directly as the megaspore mother cell. Megasporogenesis and embryosae formation are of the monosporic 8-nucleate type. The three antipodal cells by further division give rise to either six to eight nucleate antipodal cells or six to 12 cellular antipodals. In a few embryosacs, the egg divides autonomously and precociously, forming a multicelled embryo, whereas the secondary nucleus remains below the egg or towards the side of the embryo.
ISSN:0040-9618
2325-8055
DOI:10.2307/2484280