Detection of a major gene for resistance to fusiform rust disease in loblolly pine by genomic mapping.

Genomic mapping has been used to identify a region of the host genome that determines resistance to fusiform rust disease in loblolly pine where no discrete, simply inherited resistance factors had been previously found by conventional genetic analysis over four decades. A resistance locus, behaving as a single dominant gene, was mapped by association with genetic markers, even though the disease phenotype deviated from the expected Mendelian ratio. The complexity of forest pathosystems and the limitations of genetic analysis, based solely on phenotype, had led to an assumption that effective long-term disease resistance in trees should be polygenic. However, our data show that effective long-term resistance can be obtained from a single qualitative resistance gene, despite the presence of virulence in the pathogen population. Therefore, disease resistance in this endemic coevolved forest pathosystem is not exclusively polygenic. Genomic mapping now provides a powerful tool for characterizing the genetic basis of host pathogen interactions in forest trees and other undomesticated, organisms, where conventional genetic analysis often is limited or not feasible.

Contrasting complexity of two rust resistance loci in flax.

DNA probes from the L6 rust resistance gene of flax (Linum usitatissimum) hybridize to resistance genes at the unlinked M locus, indicating sequence similarities between genes at the two loci. Genetic and molecular data indicate that the L locus is simple and contains a single gene with 13 alleles and that the M locus is complex and contains a tandem array of genes of similar sequence. Thus the evolution of these two related loci has been different. The consequence of the contrasting structures of the L and M loci on the evolution of different rust resistance specificities can now be investigated at the molecular level

Green rust;

Mode of access: Internet.

Fighting rust with sublimed blue lead; an assembly of facts concerning the properties and uses of sublimed blue lead.

Mode of access: Internet.

Orchard practice for the control of blister canker of apple trees /

Cover title.

Moth and rust : together with Geoffrey's wife, and The pitfall /

Mode of access: Internet.

Research in gum, dust and rust filtering.

cover-title

Rust, smut, mildew, & mould. An introduction to the study of microscopic Fungi.

Error in paging: 262 numbered 62.

Rust; die Geschichte eines Lebens ...

Mode of access: Internet.

Ad locum M. Terentii Varronis de Re rust.,lib. ii.c.i.n.7.de nominibus Romanorum brutisonis.

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A short account of the cause of the disease in corn, called by farmers the blight, the mildew, and the rust.

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Verzoening en rust; [een vervolg of Menschenhaat en Berouw:] tooneelspel.

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Virulence, aggressiveness, evolution, and distribution of races of Puccinia striiformis (the cause of stripe rust of wheat) in North America, 1968-87.

"Issued February 1992"--P. [2] of cover.

Grasshopper egg pods destroyed by larvae of bee flies, blister beetles, and ground beetles /

Literature cited: p. 28-29.

Pathogenic specialization in cereal rust fungi, especially Puccinia recondita f. sp. tritici: concepts, methods of study, and application

Issued in cooperation with Kansas Agricultural Experiment Station.