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Effect of Three Ploidy Levels on Meiosis and Mode of Reproduction in Paspalum hexastachyum¹

Chromosome behavior, mode of reproduction, and fertility characteristics were studied in diploid (2n = 12) and colchicine-induced tetraploid and hexaploid Paspalum hexastachyum Parodi. Diploids could be distinguished from teraploid and hexaploid plants by floret size. Guard cell length and pollen diameter also were useful in identifying ploidy levels. Chromosomes paired mainly as bivalents with an occasional quadrivalent in the diploids; bivalents and quadrivalents in the tetraploids; and bivalents, quadrivalents and hexavalents in the hexaploid. The diploids were sexual but induced tetraploids and hexaploids reproduced by facultative apomixis. Diploid plants were self-incompatible but cross compatible. The plants were self-compatible at the tetraploid-chromosome level.

Key Words: Chromosome • Apomixis • Karyo-type • Self-incompatibility • Diploid • Tetraploid • Hexaploid

² Agronomist, Universidad Nacional del Noreste, Facultad de Ciencias, Agrarias, Corrientes, Argentina; and Research Geneticist, AR, SEA, USDA, and the Univ. of Georgia College of Agriculture Exp. Stn., Coastal Plain Stn., Agronomy Dep., Tifton, GA 31794.

Received for publication July 30, 1979.

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