Genetic and morphological characterization of Acroceras macrum Stapf
Fecha
2014-04-03Autor
Ferrari Usandizaga, S. C.
Brugnoli, Elsa Andrea
Weiss, A. I.
Zilli, Alex Leonel
Schedler, Mara
Pagano, E. M.
Martínez, Eric Javier
Acuña, Carlos Alberto
Metadatos
Mostrar el registro completo del ítemResumen
Acroceras macrum is a warm-season grass used for pastures, and it has high nutritive value. The scarce
genetic and reproductive information about 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, and morphological and
agronomic characteristics. The number of genotypes
among forty-seven 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 sixteen
morphological and agronomic variables were evaluated. A total of twenty-seven genotypes were identified in this collection; twenty-two genotypes were
tetraploid (2n = 4x = 36) and five 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.
Colecciones
- Artículos de revista [476]