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The Journal of Heredity 1986:77(6):457-459
© 1986 The American Genetic Association 77:457-459

research-article

Cytogenetics and breeding behavior of an apomictic triploid in bahiagrass

W. W. Hanna, and G. W. Burton

The authors are research geneticists, USDA-ARS, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Experiment Station, Agronomy Department, Tifton, GA 31793. They wish to thank Jacolyn Merriman for assistance in making cytological preparations.

Abstract

An apomlctic triploid was produced from an apomictic tetraploid X sexual diploid bahiagrass, Paspalum notatum Flugge, cross. The triploid was highly male sterile with 0.02 percent stainable pollen. It set 2.3 and 26 percent open-pollinated seed in 1981 and 1980, respectively. Frequency of tetraploid plants from triploid X diploid crosses ranged from less than one percent in 1981 to 22 percent in 1980. Both seed-set and fertilization of unreduced apomictic eggs in the triploid and seed-set and morphological variation in the tetraploids appeared to be environmentally affected. Apomixis is an important mechanism for the survival and reproduction of the triploid. The triploid is a valuable bridge whereby gene(s) controlling apomixis may be moved from the tetraploid to diploid level.


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C. A. Acuna, A. R. Blount, K. H. Quesenberry, W. W. Hanna, and K. E. Kenworthy
Reproductive Characterization of Bahiagrass Germplasm
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