Mutator-induced cytoplasmic mutants in barley: genetic evidence of activation of a putative chloroplast transposon

Article Abstract:

The mutation reversion rates of the cytoplasmic line 4 (CL4) are higher than the forward mutation rates indicating that these may be insertion mutations caused by a transposon in the corresponding mutant gene of the chloroplast (cp) gene. The selfing of a barley chloroplast mutator (cpm/cpm) genotype produces CL4 that exhibits various patterns of variegation due to cp gene mutations. The Cpm/cpm gene is probably responsible for cpDNA repair and its mutation impairs DNA repair. DNA damage converts RacA to a protease which in turn activates the transposon.

Observations, Chloroplasts, Transposons

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Molecular mapping, chromosomal assignment, and genetic diversity analysis of phytochrome loci in barley (Hordeum vulgare)

Article Abstract:

Barley, Hordeum vulgare, has five phytochrome loci that form a multigene family. These are designated as phy1, phy2, phy3 and phy4. The loci phy4 is a duplicate loci present on burley chromosomes 2 and 7. The genes phy1, phy2 and phy3 are present on chromosomes 7,4 and 5, respectively. Linkage mapping, using wheat-burley addition line, locates phy1 and phy3 loci to the short arm of chromosome 7 and centromeric region of chromosome 5, respectively. All the five loci have two to three alleles. The genetic diversity values are between 0.1 and 0.74.

Analysis, Phytochrome

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In situ hybridization mapping of genes in Hordeum vulgare L

Article Abstract:

Linkage maps of barley (Hordeum vulgare L.) having genomic and cDNA sequences and functional genes were constructed which span a large genetic distance throughout the whole genome. Three genes from the barley linkage map were physically located by in situ hybridization with biotin-labeled DNA probes. Findings revealed all of the genes investigated hybridized to barley chromosomes 5H and 6H and that the gene order on the physical map was similar to that found on the genetic map.

Genetic aspects

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