Crown rust resistance loci on linkage groups 4 and 13 in cultivated oat

Article Abstract:

Two unlinked loci located on linkage groups 4 and 13 have a major effect on resistance to crown rust in hexaploid oat, Avena spp., with some influence from additional loci. The inheritance of resistance to two isolates of Puccinia coronata, which causes crown rust, in the progeny obtained from a cross between A. byzantina cv. Kanota and A. sativa cv. Ogle supports a two-gene model. The evidence for other factors contributing to the resistance phenotype is obtained from the segregation pattern and the variation in phenotype. Data analysis using MapMaker/QTL located the two major factors in the linkage group 4 and 13.

Genetic aspects, Observations, Linkage (Genetics), Oats, Rust diseases

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Corngrass1 of maize (Zea mays L.) delays development of adult plant resistance to common rust (Puccinia sorghi Schw.) and European corn borer (Ostrinia nubilalis Hubner)

Article Abstract:

The Corngrass1 (Cg1) mutation increases the juvenile-vegetative phase length and postpones the development of resistance to common rust and European corn borer in maize. Resistance in Cg1 mid-whorl leaves is comparable to that of Cg1 and wild-type seedling leaves. Resistance in wild-type mid-whorl leaves however is different from those in other leaf types. The resistance in Cg1 mid-whorl leaves is between that in wild-type seedling and wild-type mid-whorl leaves. The results of the study show that heterochrony is probably responsible for disease and insect resistance in normal maize populations.

Physiological aspects, Plants, Plants (Organisms), Mutation (Biology), Mutation, Diseases and pests

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Mitochondrial transcript processing and restoration of male fertility in T-cytoplasm maize

Article Abstract:

Cytoplasmic male sterility (CMS) is an inherited inability to produce viable pollen, and CMS systems have been used in the production of hybrid seed in certain crops. Male sterility in T-cytoplasm maize is due to the action of a T-cytoplasm-specific mitochondrial gene, T-urf13. Progress towards the characterization of nuclear restores mediating the processing of T-urf13 transcripts in maize mitochondria, has been made.

Plant cytogenetics, Cytoplasmic male sterility

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