Abstract
The aim of this study was to establish and compare, as to their representativeness, core collections obtained from quantitative data, multicategoric, molecular and collections that covering all this information simultaneously. Ten subcollections were established from 67 tomato accessions of the Germplasm Bank of the Universidade Federal de Viçosa (BGH-UFV), characterized according to 19 quantitative traits, 30 multicategoric characters, 52 ISSR loci and to the reaction to three pathogens. These subcollections were defined by the combination of the nature of data collected and the sampling rate. The COD-20 subcollection stood out in 20% intensity of sampling by has higher rates of coincidence amplitude followed by more appropriate values of variance. At 30% intensity, subcollection MOL-30 was as efficient as the subcollection COD-30 when considering only the rates of coincidence of the amplitude and the variances. However, the graphical analysis of the variability showed a slight superiority of subcollection COD-30 in maintaining the variability, especially regarding multicategoric characters. So whenever data from different sources are available, should be prioritized the establishment of core collections from the integration of these data, since these were more representative when the amplitude coefficient, variance, and retention index of variability, are regarded simultaneously.
Highlights
The emphasis given to the importance of preserving genetic resources has led to the formation and maintenance of large germplasm collections around the world
With the objective of enhancing utilisation and accessibility, and minimising maintenance difficulties, Frankel (1984) proposed the concept of the core collection, as being a subsample derived from a set of germplasm chosen to represent, with minimum redundancy, the maximum genetic variability of the initial collection or base of a particular species
The study was carried out on a set of data of 67 tomato accessions from the Vegetable Germplasm Bank of the Federal University of Viçosa (BGH-UFV); all had been previously characterised for 19 quantitative features, 30 multi-category features and 53 ISSR loci - determined by Aguilera et al (2011) - and for their reaction to Alternaria solani, Pseudomonas syringae pv
Summary
The emphasis given to the importance of preserving genetic resources has led to the formation and maintenance of large germplasm collections around the world. The large size of these collections has often been an obstacle to their use, conservation and management (VASCONCELOS et al, 2010). With the objective of enhancing utilisation and accessibility, and minimising maintenance difficulties, Frankel (1984) proposed the concept of the core collection, as being a subsample derived from a set of germplasm chosen to represent, with minimum redundancy, the maximum genetic variability of the initial collection or base of a particular species. Establishing a core collection requires an integrated effort involving curators, breeders and geneticists, to define the size and the accessions that will make up the collection (ABADIE et al, 2005). It will be based on the information available concerning germplasm diversity, which can take different forms, such as passport data (genealogical, geographical origin) (DWIVEDIL; UPADHYAYA; HEDGE, 2005; LI et al, 2004), phenological data (UPADHYAYA et al, 2007), morphoagronomical data (WANG et al, 2011; ZEWDIE; TONG; BOSLAND, 2004), or molecular data (HAO et al, 2006; WANG et al, 2006)
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