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Mode of reproduction and seed production inPaspalum dilatatum poir virasoro biotype - Dilatata group (Gramineae)

Maria Clara Mallmann Hickenbick^I; Ana Izaura Pereira Flores^II; Suzana Cavalli-Molina^I; Luis Henrique Weber^II; André Cláudio O. Kersting^I; Luciane Santos Costa^II; Tatiana Teixeira de Souza-Chies^I; Maria Helena Albarus^I

^IDepartamento de Genética, Instituto   de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Bloco 3, prédio E-2, Caixa Postal 15501, 91501 Porto Alegre, RS, Brasil. Send correspondence to S.C.M.
^IIDepartamento de Plantas Forrageiras e Agrometeorologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 7712, 91500 Porto Alegre, RS, Brasil

ABSTRACT

Grasses of the Dilatata group, genus Paspalum, are excellent forage plants. We studied the Virasoro biotype of Paspalum dilatatum, which has been described for the Governador Virasoro area, Argentina, but also occurs in the State of Rio Grande do Sul, Brazil. The plant was found to reproduce sexually and to present 20 bivalents, normal chromosome segregation, and an embryo sac of the "Polygonum' type with proliferating antipodals. Reproduction occurs both by self fertilization and by cross fertilization. The variability in progenies detected by isozyme analysis may be attributed to segregation of both structural and modifying genes. The germination of this biotype far exceeds that of any other P. dilatatum entity, with 57.9% mean percent germination, 81% mean percent full seeds, and 72.8% mean percent germination of full seeds. These factors, taken together with low seedling mortality (* = 8.3%), recommend propagation of this forage plant via seed production.

Keywords: Seed production; Paspalum dilatatum; Gramineae.

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