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- Title
Inheritance of rust resistance in <em>Macroptilium atropurpureum</em>.
- Authors
Bray, R. A.
- Abstract
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 F2 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-aIlelic. 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.
- Subjects
PLANTS; BOTANY; SEEDLINGS; PERMUTATIONS; PHAKOPSORA pachyrhizi; SOYBEAN rust disease
- Publication
Plant Pathology, 1988, Vol 37, Issue 1, p88
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/j.1365-3059.1988.tb02199.x