MORPHO-AGRONOMICAL CHARACTERIZATION OF DOMESTICATED COMMON BEAN CORE COLLECTION FROM MEXICO

摘要

Characterization deficiencies are the major challenge for systematic use of common bean (Phaseolus vulgaris L.) diversity in genetic breeding programs. Due to complications observed for detailed crop evaluations in huge number of accessions it is necessary to create representative and manageable core collections. Core collections are small, but thoroughly representative samples which facilitated diversity characterization in several crops. There are 7,846 accessions at INIFAP's (Institute Nacional deInvestigaciones Forestales, Agricolas y Pecuarias; National Institute for Forestry, Agriculture and Livestock Research) common bean germplasm bank. A subset consisting in 200 accessions were selected to represent the gene bank's entire common bean holdings. Selection was made considering seed color and germplasm origin, representing regions where bean domestication could have been carried out such as the borders of states of Guanajuato, Jalisco and Michoacan (Payro-de la Cruz et al., 2005). Other regions where common bean was traditionally planted or recently introduced were also considered. Evaluating the core collection for a wide range of traits such as morphological, agronomic and disease resistance could be used to identify parents which can be incorporated into breeding programs. Objectives were to characterize using morpho-agronomical traits and to evaluate the representative degree included in a subset of 200 accessions selected as a core collection in INIFAP's common bean germplasm bank.