Abstract
Review studies on the world Pisum genetic resources have shown that stem fasciation is controlled by three loci, i.e., fa1 (LGIV; Wt 10006 - type line of the Polish Gene Bank), fa2 (LGV, the line Wt 12185), and fas (LGIII, the line Shtambovii). Outstanding advantages of this character (e.g., pods gathered in upper part of a stem) resulted in breeding some cultivars. Preliminary investigations suggested linkages of the newly described fa2 gene within the gp–U segment. Based on the further linkage test crosses, it was stated that the fa2 is localized between the gp and Pis_Gen_9_3_1 markers (in the LGV). Additionally, four molecular markers (AD175, AB146, AC58, and AD280) and the morphological marker lk were also localized in this segment. Moreover, rms5, lum3, and cri were found to map on the other side of gp with tight linkage observed between lum3 and cri.
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