INTRON-BASED SEQUENCE DIVERSITY STUDIES IN PHASEOLUS

摘要

Molecular markers are useful for diversity studies in plants. In turn, diversity studies can address agrocentric interests, such as identifying variable parents for hybridization or fingerprinting cultivars. Diversity studies can also address such evocentric interests as describing the genetic architecture of a species and the relationship of that architecture to the organization of diversity in the genus. In particular, such studies have shown that P. vulgaris landrace diversity is a subset of thatfound in the species (Gepts and Bliss 1986; Tohme et al. 1996), that common bean contains two major genepools (Gepts and Bliss 1986; Kami and Gepts 1994), and that these genepools are divided into races (Singh et al. 1991; Beebe et al. 2001. At the genus level, diversity studies have demonstrated the monophyletic origin of the genus Phaseolus (Delgado-Salinas et al. 1999).