INVESTIGADORES
HONFI Ana Isabel
artículos
Título:
Cytotaxonomy of Tripogandra diuretica and T. glandulosa (Commelinaceae) from NE Argentina
Autor/es:
GRABIELE MAURO; HONFI ANA ISABEL; DAVIÑA J. R.
Revista:
PLANT BIOSYSTEMS
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Año: 2012 vol. 145 p. 309 - 316
ISSN:
1126-3504
Resumen:
Karyotype features and microsporogenesis of Tripogandra diuretica (Mart.) Handlos and Tripogandra glandulosa (Seub.)Rohw. from 15 NE Argentina accessions are analysed via classical cytogenetics, CMA/DA/DAPI and Ag-NOR. The karyotype of T. glandulosa (2n=2x=16; 2m +6sm+8st) is bimodal (A2 =0.37; R=2.65) and asymmetrical (A1 =0.63;i=26.06; r˃2=0.88) (3B-Stebbins) with a genome size of 33.28 mm; two pairs are satellited, CMA + band NOR-actives.Another four CMA loci and DAPI universal centromeric heterochromatin occur. Microsporogenesis is normal (pollen viability short stamens = 97.8%; large = 96.7%), meiotic behaviour is regular and chromosomes pair as 8II. The karyotype of T. diuretica (2n=8x=64; 8m+24sm+32st) is bimodal (A2= 0.27; R=2.54) and asymmetrical (A1 =0.60; i=27.32;r˃2=0.88) (3B-Stebbins); additionally, two pairs are satellited. Microsporogenesis is normal (short stamens =77.8%; large=68.5%), except for micronuclei and low pollen viability in some accessions. Meiotic behaviour is regular with 32II,acting as a cytological diploid, however the arrangement of the haploid karyotype suggests that T. diuretica, which also exhibits a reduction of the genome size (18.58 mm), constitutes an auto-octoploid taxa. Additionally, both species share cytological features common to karyotype orthoselection.