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Inheritance of rust resistance in Macroptilium atropurpureum
Author(s) -
BRAY R. A.
Publication year - 1988
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1988.tb02199.x
Subject(s) - biology , locus (genetics) , allele , genetics , cultivar , botany , gene
Sixteen accessions of Macroptilium atropurpureum showed a range of reaction types when seedlings were inoculated with a single‐urediniospore isolate of Uromyces appendiculatus (rust). Analysis of F 2 families of crosses with the susceptible cv. Siratro showed that in seven accessions resistance was dominant, regulated by a single locus in four of these but by more than one locus in the three others. At least three of these loci were identified as non‐allelic. In one accession resistance was near‐recessive and regulated at a single locus, while combinations of dominant and recessive alleles at different loci explained the segregation of resistance in other accessions. Loci with partial dominance and expressivity varying with environment were also observed. There was some evidence that the expression of resistance could be temperature sensitive and that the fungus exhibited differential virulence.