Genetic structure and a selected core set of brazilian soybean cultivars

Abstract

Soybean is one of the most valuable and profitable oil crop species and a thorough knowledge of the genetic structure of this crop is necessary for developing the best breeding strategies. In this study, a representative collection of soybean cultivars recommended for farming in all Brazilian regions was genotyped using 27 simple sequence repeat (SSR) loci. A total of 130 alleles were detected, with an average allelic number of 4.81 per locus. These alleles determined the core set that best represented this soybean germplasm. The Bayesian analysis revealed the presence of two clusters or subgroups within the whole collection (435 soybean cultivars) and the core set (31 entries). Cultivars of similar origin (ancestral) were clustered into the same groups in both analyses. The genetic diversity parameters, based on the SSR loci, revealed high similarity between the whole collection and core set. Differences between the two clusters detected in the core set were attributed more to the frequency of their ancestors than to their genetic base. In terms of ancestry, divergent groups were presented and a panel is shown which may foster efficient breeding programs and aid soybean breeders in planning reliable crossings in the development of new varieties.

Tracking footprints of selection associated with soybean adaptation to Central-East Europe environments

“…This indicates the influence of pedigree on STRUCTURE results. Similarly, a study of (Priolli et al 2013) showed that, after clustering soybean varieties assuming their pedigrees, varieties with similar ancestral origin were distributed into the same group. A large contribution of an ancestral variety, Lincoln, to the elite gene pool can be explained by its pedigree; it is developed from a cross between Mandarin and Manchu varieties.…”

Genetic Diversity and Population Structure in the Landrace Accessions of Gossypium hirsutum

“…This panel can also be used in association studies to identify major genes or QTL controlling important traits. Core sets identified based on genetic markers are available in a number of field crops, like elite upland cotton (Tyagi et al, 2014), pima cotton (Xu et al, 2006), corn (Liu et al, 2003), soybean (Kuroda et al, 2009; Priolli et al, 2013), and fruit crops like watermelon ( Citrullus lanatus Thunb.) (Zhang et al, 2011).…”

Molecular genetic characterization of Central European soybean breeding germplasm

“…In soybean, genetic diversity and LD were analysed with different molecular markers in ancestors of North American soybean cultivars (Zhu et al 2003) and in soybeans of Western Europe (Tavaud-Pirra et al 2009). Furthermore, similar analyses were performed in cultivated soybean landraces from China (Li et al 2008), in Korean and Chinese soybean accessions (Lee et al 2011), in Japanese landraces and varieties (Kaga et al 2012), in Brazilian soybean cultivars (Priolli et al 2013), in vegetable soybean from China (Dong et al 2014) and in multiple soybean populations including cultivars of different origin (Hyten et al 2007). Recently, sequencing (Schmutz et al 2010) and resequencing (Lam et al 2010, Li et al 2013) studies extended the work on genetic diversity and LD of soybean, but a detailed characterization of Central European soybean germplasm is lacking to date.…”

“…), in Brazilian soybean cultivars (Priolli et al. ), in vegetable soybean from China (Dong et al. ) and in multiple soybean populations including cultivars of different origin (Hyten et al.…”