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Sexual Reproduction in Panicum maximum Jacq.¹

Completely sexual plants of Panicum maximum Jacq., formerly believed to be an apomictic species, were isolated. Progenies of 742 plants were screened for within-progeny variability to locate these sexual plants. Off-type and typical selections were tested, with segregating progenies being over 20 times more frequent in the off-type group. This indicates the importance of testing off-type plants when searching for sexual plants in an apomictic species. Segregating families also segregated for apomixis and sexuality, with sexuality being predominant. Morphological and biochemical (esterase and peroxidase) withinprogeny variability was sufficient to be explained only by sexual recombination. Final proof of sexuality was the transfer of isoenzymes from the pollen parent in hybrid progeny.

Key Words: Apomixis • Guinea grass • Segregation • Isoenzymes • Hybrid

² Assistant Professor of Agronomy, Florida Agricultural Experiment Station.

Received for publication March 4, 1972.