| Gene Symbold |
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Class
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Level 1
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Gametocidal Genes
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Level 2
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Gametocidal activity
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Level 3
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Level 4
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Symbol
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Wild Type
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Gc3-C1
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Allele
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Synonyms
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Gc-C{1485}
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Chromosomes
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3C{333}
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Germplasms
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ad:CS/Ae. triuncialis{338}
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Comment
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Gc1-B1a, Gc1-B1b and Gc1-S1, classified in the same functional group, are hypostatic to the genes Gc2-S11a and Gc2-S11b. Gc3-C1 does not interact with the Gc genes in the other two groups.
In addition to these genes, chromosomes carrying gametocidal genes occur in Ae. caudata {337}, Ae. cylindrica {336} and other strains of Ae. longissima and Ae. sharonensis {335,1484}.
Gametocidal genes in chromosomes in the same homoeologous group have the same gametocidal action {0190}. In monosomic additions of chromosomes with gametocidal effects, chromosome deletions and translocations are produced in gametes not having the gametocidal genes. This feature has been exploited to isolate genetic stocks suitable for physical mapping of wheat {0191} chromosomes, and of rye {0192} and barley {0193,0194,0195} chromosomes in a wheat background.
Genes with gametocidal activity (Sd1 {1647} and Sd2 {1161}) in wheat are present in homoeologous group 7 chromosomes of Thinopyrum elongatum {653,1647}. A segment earlier believed to be derived from Thin. distichum {889,892} is probably the same as that from Thin. elongatum {1162}.
In the presence of both Sd1 and Sd2, Lr19 is transmitted preferentially in heterozygotes, the degree of distortion being determined by genetic background. In heterozygotes with the same background, and in the presence of only Sd2, Lr19 shows strong self-elimination. Based on these results, it seems likely that the Sears' translocation 7D-7Ag#7 does not carry Sd1 {939}.
See also Pollen Killer.
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