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Published in Crop Sci 9:219-222 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Microsporogenesis and Embryogenesis in Pennisetum flaccidum Griseb1

Asoke K. Chatterji and D. H. Timothy2

The chromosome number, 2n = 36, of the Himalayan forage grass Pennisetum flaccidum Griseb. was reported for the first time. Chromosomes formed 12 to 14 bivalents and two to three quadrivalents at diakinesis. The species was considered to be tetraploid with x = 9 as the basic number. Meiosis was generally regular with some early disjunction, laggards, and micronuclei. Pollen sterility was 22.8%. Embryo development was aposporous. Normal megaspores degenerated following formation of several four-nucleate nucellar sacs. Ultimately, one nucellar embryo sac survived and gave rise to a single embryo. Endosperm development and division was presumed to stimulate embryo differentiation and development.

Key Words: Apomixis • Apospory • Chromosome number • Forage grass • Tetraploid

1 Paper no. 2721 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.

2 Post-doctoral Scholar supported by Institute of International Education (now Associate Lecturer, Applied Botany Section, Indian Institute of Technology, Rharagpur, W. Bengal, India) and Professor of Crop Science, North Carolina State University, Raleigh 27607.

Received for publication September 9, 1968.




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