INVESTIGADORES
ACUÑA Carlos Alberto
artículos
Título:
Genetic and morphological characterization of Acroceras macrum Stapf
Autor/es:
SILVANA C. FERRARI USANDIZAGA; ELSA A. BRUGNOLI; ALEJANDRA I. WEISS; ALEX L. ZILLI; MARA SCHEDLER; ELBA PAGANO; ERIC J. MARTÍNEZ; CARLOS A. ACUÑA
Revista:
GRASS AND FORAGE SCIENCE (PRINT)
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2015 vol. 70 p. 695 - 704
ISSN:
0142-5242
Resumen:
Acroceras macrum is a warm-season grass used for pastures and it has high nutritive value. The scarce genetic and reproductive information of this grass is limiting its breeding for forage. The objective of this research was to determine the number of genotypes and cytotypes present in a collection established in Argentina, and to estimate the diversity of this species based on molecular markers, morphological and agronomic characteristics. The number of genotypes among 47 accessions was determined using ISSR markers. The identified genotypes were further characterized for ploidy levels. In addition, the genetic distances among them were estimated with ISSR markers. They were also propagated and planted into the field following a randomized complete block design with four replications, and a group of 16 morphological and agronomic variables were evaluated. A total of 27 genotypes were identified in this collection; 22 genotypes were tetraploid (2n=4x=36) and 5 were hexaploid (2n=6x=54). These two cytotypes were found clearly separated by both genetic and phenotypic characteristics. Above-ground biomass, internode length, initial growth and number of spikelets per inflorescence were the most variable traits. The high diversity present in this collection will allow for the initiation of a breeding programme for A. macrum.