Genetic divergence between genotypes of forage peanut in relation to agronomic and chemical traits

Abstract

-The objective of this study was to evaluate the genetic divergence of forage peanut in relation to agronomic and chemical traits in both rainy and dry seasons. This experiment was conducted with genotypes from the Forage Peanut Active Germoplasm Bank located in Embrapa Acre. Eighteen genotypes of forage peanut were used: 12 genotypes of A. pintoi, four genotypes of the A. repens species and two interspecific hybrids of A. pintoi × A. repens. The design was of randomized blocks with five replicates. All traits were submitted to analyses of variance and later, study of genetic divergence was done through multivariate analysis techniques, in which the Tocher's optimization method and the nearest neighbor method were used. Dissimilarity measure used in cluster analysis was the generalized distance of Mahalanobis. No pattern was found in the cluster based on species used, according to the results. There is genetic variability for all traits except neutral detergent fiber, acid detergent fiber, hemicellulose and lignin in the rainy season and for pests in the dry season. The traits which presented most relative contribution in the study of genetic divergence of forage peanut were flowering, dry matter yield and average height in the rainy season and crude protein and average height in the dry season. The established cluster may help the breeder to choose parents and crossings to be selected in forage peanut breeding programs.

Genetic diversity of the forage peanut in the Jequitinhonha, São Francisco, and Paranã River valleys of Brazil

“…Accession 60Ar exhibited a high degree of ancestry from gene pool III. This result corroborates those obtained in studies by Gimenes et al (2000) and Menezes et al (2012), who found that accession 60Ar was grouped with A. pintoi accessions, confirming the proximity of this A. repens accession to A. pintoi.…”

“…characterized the bristle of the stigmatic surface and found four clusters, three of which clustered accessions of both species. Menezes et al (2012) studied the agronomic and bromatological characterization of the section Caulorrhizae and found six clusters, four of which consisted of A. pintoi and A. repens genotypes.…”

“…Discrimination between original accessions of A. pintoi and A. repens is based on morphological characteristics, such as leaflet shape and size and bristle density and location (Krapovickas and Gregory, 1994;Monçato, 1995;Menezes et al, 2012). However, with the increase in the number of accessions obtained from germplasm collection expeditions in the last 20 years, types with intermediate characteristics have been found (Monçato, 1995).…”

Forage peanut (Arachis spp.) genetic evaluation and selection

“…Arachis pintoi , A. repens Handro and their hybrids present several features related to persistence in the pasture sward, and they differ from those of other forage legumes (Menezes et al ., ) in their tolerance to adverse management conditions, resistance to grazing and stoloniferous growth (having a strongly rooted stolon and well‐protected meristem growing points). Arachis persistence is also related to the presence of buried seed reserves (Assis et al ., , ).…”

Perennial peanut hay nutritive value

“…The DM averages ranged from 89.1 to 91.6% (Table 2) and corroborate MS values 88.70; 88.10 and 92.80% reported for perennial peanut hays. 2,7,12 Normally to be considered a hay foodstuff, it DM can be below 15% in order to avoid damage microorganisms proliferation. 10,13 Considering only the DM ( Table 2) the A. pintoi hay can be a forage source without contamination problems, if the storage conditions were adequate.…”