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Crippled trifoliolate leaves were observed in two lines from interracial populations of common bean (Phaseolus vulgaris L). The lines, WA 7807-305 and TY 5578-220, were F2-derived F6 recombinant inbreds from populations Rio Tibagi/ABA 58 and Brasil 2/ICA L 23, respectively. Rio Tibagi and Brasil 2 are small-seeded, grow in tropical lowlands, and belong to the race Mesoamerica. In contrast, ABA 58 and ICA L 23 belong to the large-seeded Andean race Nueva Granada. The two lines were crossed with each other, with one of their normal parents, and with tester stocks. The normal parents and tester stocks carried either the DI1 or DI2 gene. These genes are complementary dominant, dosage dependent lethal, and known to cause hybrid dwarfism or plant stunting. The recessive gene Icr causes trifoliolate leaf crippling in the presence of either DI1 or DI2. When both DI1 and DI2 are present, a dwarf-lethal or semilethal phenotype is produced, irrespective of the alleles at the Icr locus. Thus, the genotypes of the lines are, for WA 7807-305: DI1 DI1 dl2 dl2 Icr Icr, and for TY 5578220: dl1 dl1 DI2 DI2 Icr Icr. Other reported cases of developmental abnormalities are reviewed and their significance for common bean improvement is discussed.

Inheritance of Crippled Trifoliolate Leaves Occurring in Interracial Crosses of Common Bean and Its Relationship With Hybrid Dwarfism