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Genetics of Wheat Curl Mite Resistance in Wheat: Recombination of Cmc 1 with the 6D Centromere
Author(s) -
Thomas J. B.,
Whelan E. D. P.
Publication year - 1991
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1991.0011183x003100040019x
Subject(s) - biology , centimorgan , centromere , locus (genetics) , genetics , recombination , common wheat , chromosome , gene , gene mapping
Wheat streak mosaic is a destructive disease of common wheat ( Tritium aestivum L. era. Thell.) that is vectored by the wheat curl mite, Erlophyes [Acerla] tulipae (Keifer). Resistance to colonization by this vector has been transferred to wheat from several host grasses but has not been reported in wheat perse. Resistance to wheat curl mite was transferred from Aegilops sqnarrosa L. to common wheat where it was shown to be conditioned by a single dominant gene ( Cmc 1) located on the short arm of Chromosome 6D. Compared with other, more alien transfers, the linkage block containing Cmc l is not expected to interfere with crossover and recombination on this chromosome. This study was undertaken to estimate recombination frequency in the chromosome segment proximal to the Cmcl locus. Recombination between Cmc 1 and the 6D centromere among female gametes of plants monotelodisomic for Chromosome 6Ds occurred in 56 out of 107 cases (about 52.3%). The 95% confidence interval for this sample lies between 42.9 and 61.8. Correction of the lower limit for double crossovers showed ( P > 0.95) that Cmc l was further than 64.3 centimorgans from the centromere of 6Ds.