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Allelic Interactions at the Pu Locus in Sorghum bicolor (L.) Moench 1
Author(s) -
Miller F. R.,
Cruzado H. J.
Publication year - 1969
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1969.0011183x000900030026x
Subject(s) - sorghum bicolor , biology , sorghum , locus (genetics) , dominance (genetics) , allele , horticulture , gene interaction , phaseolus , botany , agronomy , genetics , gene
Sorghum rust ( Puccinia purpurea Cke.) inheritance studies indicate that allelic interactions exist at the Pu locus in Sorghum bicolor (L.) Moench. A reversal dominance was observed when B406 contributed the pu allelomorph but normal dominance existed when Combine Shallu donated the pu r allelomorph; in crosses to two different sources of resistance. In addition, an interaction for rapidity of uredial development was observed between crosses. When Pu was considered in association with pu r (from ‘Combine Shallu’), complete normal dominance resulted. In F 1 or testcross progenies the genotypes Pu Pu and Pu pu r could not be separated. On the other hand, Pu Pu and Pu pu ( pu from B406) were readily separable in F 1 or testcross individuals which demonstrated the late‐season reversal of dominance. The late‐season rusting, reversal of dominance in certain individuals, provides an example of slow rusting in sorghum, a condition existing as an intra‐allelic interaction. Genotypes Pu Pu , Pu pu , and Pu pu r gave satisfactory control of rust in early‐season, although Pu pu became inferior in late season.