EL CARIOTIPO DE PASPALUM CROMYORRHIZON DIPLOIDE Y TETRAPLOIDE (POACEAE, PANICOIDEAE, PASPALEAE)

REUTEMANN A.VERENA; MARTÍNEZ, ERIC J; DAVIÑA JULIO R.; HOJSGAARD, DIEGO; ANA I. HONFI

DARWINIANA

INSTITUTO DE BOTÁNICA DARWINION

Lugar: Buenos Aires; Año: 2021 vol. 9 p. 375 - 386

0011-6793

Reutemann, A. V.; E. J. Martínez, J. R. Daviña, D. H. Hojsgaard & A. I. Honfi. 2021. The karyotypeof diploid and tetraploid Paspalum cromyorrhizon (Poaceae, Panicoideae, Paspaleae).Paspalum cromyorrhizon Trin. ex Döll is a species adapted to low and humid fields, river and streambanks, throughout S Brazil, Uruguay and NE Argentine. Diploids (2n= 2x= 20) and tetraploids (2n=4x= 40) from natural populations of P. cromyorrhizon from Corrientes (Argentina) were used toanalyze the karyotype morphometry of both cytotypes. The chromosome count was performed usingclassical Feulgen staining. The karyotype of diploid P. cromyorrhizon has 20 metacentricchromosomes, while the tetraploid has a karyotype of 40 metacentric chromosomes. The total lengthof the chromosomal complement in diploids is 32.5 μm and in tetraploids 63.5 μm, the totalmonoploid chromosome length is 15.48 μm in diploids and 15.21 μm in tetraploids and bothkaryotypes are symmetrical. Karyotype analysis confirms the autopolyploid origin proposed fortetraploids