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Genome Relations Between Tetraploid Paspalum dilatatum and Four Diploid Paspalum Species¹

Reciprocal hybridizations were made between yellow-anthered dallisgrass, Paspalum dilatatum Poir (2n=4X=40), and four diploid species (2n=2X=20), P. inter. medium Munro. ex Morong, P. jurgensii Hackel, P. notaturn Flugge, and P. vaginatum Swartz. Percent cross-ability ranged from 0 to 10.5. Generally a greater number of hybrids were produced with yellow-anthered dallisgrass as the female parent. All hybrids were 2n=3X=30. The meanm eiotic pairing relationships were: 10.14 I and 9.93 II for 63 yellow-anthered P. dilatatum x P. intermedium hybrids; 10.27 I and 9.86 II for one reciprocal hybrid; and 10.30 I and 9.85 II for 20 yellow-anthered P. dilatatum x P. jurgensii hybrids; and 10.38 I and 9.81 II for three reciprocal hybrids. Meanp airing relationships were: 27.96 I and 1.02 II for 28 yellow-anthered P. dilatatum x P. notatum hybrids; 28.56 I and 0.72 II for five reciprocal hybrids; and 28.07 I and 0.96 II for 38 yellow-anthered P. dilatatum x P. vaginatum hybrids. All hybrids were completely sterile. The P. intermedium and P. jurgensii genomes are homologous to those of yellow-anthered P. dilatatum. These two diploid species are possible progenitors of yellow-anthered P. dilatatum. Lack of chromosome pairing in the hybrids with P. notatum and P. vaginatum indicates they are not closely related to yellow-anthered P. dilatatum.

Key Words: Phylogenetic relationship • P. intermedium • P. jurgensii • P. notatum • P. vaginatum • Megasporogenesis • Morphology • Dallisgrass

² Associate Professor and Formerly Graduate Research Assistant, Agronomy Department, Mississippi State University, and Research Agronomist, Agricultural Research Service, USDA and Mississippi Agricultural and Forestry Experiment Station. Mississippi State, MS 39762.

Received for publication July 9, 1973.

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