Simple Genetic Control of Hybrid Plant Development in Interspecific Crosses betweenPhaseolus vulgarisL. andP. acutifoliusA. Gray

摘要

AbstractCrosses were performed between ninePhaseolus vulgarislines (as females) and sevenP. acutifoliuslines (as‐ male to examine parental compatibility for the production of vigorous hybrid And backcross plants,in vitroembryo rescue techniques were required to secure hybrid and backcross proseny following interspecific crossing. Seedling development appeared to be dependent on which allele theP. vulgarisparent carried at an interspecific incompatibility locus. Seven of the nineP. vulgarislines tested carried an allele at this locus which interacted with a nuclear factor in theP. acutifoliusgenome resulting in stunted, sub‐lethal hybrids. The lines, ICA pijao' and ‘Sacramento Light Red Kidney’ did not carry this allele and produced vigorous hybrid progeny in combination with allP. acutifoliusparents. Intensive backcrossing produced progeny which also segregated for sub‐lethal and viable plant development. The observed segregation patterns suggest that a bridge crossing scheme would facilitate the introgression ofP. acutifoliusgermplasm into incompatibleP. vulgarislines. Similarities, with an intraspecific incompatibility system are