Chromosome Studies in the Complex Galactia - Collaea - Camptosema (Diocleinae, Phaseoleae, Papilionoideae, Fabaceae)

SEDE, S. M.; DEZI, R.; GREIZERSTEIN, E.; FORTUNATO, R. H.; POGGIO, L.

CARYOLOGIA

Universidad de Florencia

Lugar: Florencia, Italia; Año: 2003 vol. 56 p. 295 - 301

0008-7114

The genera Galactia, Camptosema and Collaea are grouped in a complex due to exomorphological similarities and different criteria have been adopted to delimit them. The objective of this contribution is to analyse the chromosomal characteristics in some species from the austral regions of South America. Chromosomes numbers and karyotypes of four species of Galactia (G. texana, G. latisiliqua, G. fiebrigiana var sericophylla and G. striata), one species of Collaea (C. stenophylla)  and one species of Camptosema (C. rubicundum) were studied. Chromosome numbers of G. texana (2n=20), G. striata (2n=20) and C. stenophylla (2n=20) confirm previous reports, while those of G. latisiliqua (2n=20), G. fiebrigiana var sericophylla (2n=20) and Camptosema rubicundum (2n=22) are presented for the first time. The karyotypes of Galactia (16m + 4m-sm) and Collaea sprecies (14m + 2 m-sm + 4 sm) showed no distinctive characteristics, since both genera are characterized by small median chromosomes. Camptosema rubicundum presented a different chromosome number, as well as a distinctive karyotype morphology: 12 m + 2m-sm + 4 sm + 4 st-t; these features permit to characterise this species from the others included into this study.