Nuclear DNA content variation in Phaseolus (Fabaceae).

ATILIO P. CASTAGNARO, LIDIA POGGIO Y CARLOS NARANJO

DARWINIANA

INSTITUTO DE BOTÁNICA DARWINION

Lugar: Buenos Aires; Año: 1990 vol. 30 p. 195 - 200

0011-6793

ABSTRACT: A study of nuclear DNA content (2C) was made in a Phaseolus coccineus L. ssp. coccineus (cv. Pallar comun) population and in five accesssions of P. vulgaris L. (including var. aborigineus (Burk.) Baudot) using microspectrophotometric methods with Feulgen staining. The re¬sults show that the P. coccineus cultivar (1.98 pg) has a higher DNA content than the P. vulgaris accessions (Alubia Cerrillo = 1.79 pg; var. aborigineus = 1.71 pg; Exp. 113 = 169 pg; Dor 41 = 1.63 pg; Dor 57 = 1.56 pg) analyzed. P. vulgaris var. aborigineus and P. vulgaris cv. Experimental 113 have a total chromosome length of 33.10 and 32.50 urn respectively. P. coccineus have larger chromosomes (TCL = 46.92 pm) and bigger C+ chromocenters in interphase. Those accessions with the highest DNA content arc better adapted to cold and moderate climate regions.