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The genera Vicia and Lathyrus (Leguminosae) in Rio Grande do Sul (Southern Brazil): cytogenetics of native, naturalized and exotic species

Maria Teresa Schifino-Wittmann; Adriaha Helena Lau; Carine Simioni

Departamento de Plantas Forrageiras e Agrometeorologia, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Caixa Postal 776, 90001-970 Porto Alegre, RS, Brasil. Send correspondence to M.T.S.-W.

ABSTRACT

Chromosome numbers, meiotic behavior and pollen grain fertility were studied in native, naturalized and exotic Vicia and Lathyrus species of Rio Grande do Sul.
Four native (V. epetiolaris (2n=14), V. nana (2n=14), V. linearifolia (2n=14), V. macrograminea (2n=14)) two naturalized (V. angustifolia (2=10, 12 and 14), V. disperma (2n=14)) and five exotic (V. faba (2n=12), V. villosa (2n=14), V. sativa (2n=12), V. hirsuta (2n=14), V. panonica (2n=12), from Santa Catarina) Vicia species were examined. Meiotic behavior was regular and meiotic indexes and pollen grain fertility (stainability) was generally over 90%. Chromosome number polymorphism found in the V. sativa - V. angustifolia complex, and the occurrence of morphologically intermediate types, agrees with observations from other authors concerning European populations.
The six native (L. pusillus, L. subulatus, L. paranensis, L. pubescens, L. nervosus, L. sp) and two exotic (L. sativus, L. latifolius) Lathyrus species analyzed were diploid, with 2n=14 chromosomes. Meiotic behavior was regular and meiotic indexes and pollen grain fertility were generally over 90% (except some plants of L. sp and L. paranensis).
Interspecific differences in chiasma frequency and pollen grain size were found in both genera.

Keywords: Vicia; Lathyrus; cytogenetics; naturalized; exotic species.

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