However, accessions with desirable agronomic or nutritional trait

However, accessions with desirable agronomic or nutritional traits in a MCC are rare, owing to the need to include as many accessions as possible with various traits while preserving appropriate sample sizes. For this reason, accessions with

specific traits identified in MCCs could be used only as indicators for directional identification of more elite accessions from CCs or FCs. For example, click here for studying disease resistance, stress tolerance and other traits, soybean accessions in MCC can first be used to characterize the distribution of different traits, and then a large number of accessions may be evaluated based on these distributions. This strategy has been used to identify elite accessions in previous studies of salt tolerance and soybean cyst nematode (SCN) resistance [27] and [28]. In the present study, we developed an integrated applied core collection (IACC) for soybean that consists of accessions with cold tolerance, drought tolerance, salt tolerance, SCN resistance, soybean mosaic virus (SMV) resistance, high protein content and high fat content. Here, IACC was defined as a core collection of accessions with different desirable agronomic and nutritional traits fulfilled

with interest to genetic research and breeding programs. The diversity of this newly formed IACC was compared with that of the established

MCC of soybean. IACC of soybean developed in this study lays a foundation for selection of crossing parents fulfilling various breeding goals in different eco-regions. Soybean accessions were obtained from the Chinese National Soybean GeneBank (CNSGB) at the Institute of Crop Science, Chinese Academy of Agricultural Sciences. A large-scale evaluation of agronomic traits of the conserved accessions of cultivated soybeans was performed. A total of 159 soybean accessions, including 18 from the MCC and 141 from the FC of soybean, were selected. These 159 accessions accounted for about 10% of accessions in the FC carrying at least one of seven desirable agronomic or nutritional traits of particular interest to genetic research and breeding programs. Protein kinase N1 This selection strategy was aimed at obtaining similar proportions of accessions with each desirable trait from the FC based on the phenotypic data. The seven traits included cold tolerance (rank 0 or 1), drought tolerance (rank 0 or 1), salt tolerance (high tolerance, relative salt injury index less than 20 in bud or/and injured leaf area less than 10% in seedling stage), SCN resistance (rank 0 or 1 to race 1, 2, 3, 4 and/or 5), SMV resistance (rank 1), high seed protein content (at least 50.0%), and high seed oil content (at least 23.0%).

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