Title: A spontaneous translocation that transfers wheat curl mite resistance from decaploid <i>Agropyron elongatum</i> to common wheat
Abstract: The wheat curl mite (Eriophyes tulipae Keifer) is the vector of wheat streak mosaic virus, a damaging disease of winter wheat. A translocation between a common wheat (Triticum aestivum L.) chromosome and a group 6 chromosome (6Ag) from decaploid Agropyron elongatum (Host) Beauv. resulted in transfer of resistance to colonization by the wheat curl mite. Transmission of resistance through the pollen and the egg were similar and not significantly different from 50%. The frequency of resistance in the F 2 generation (65.6%) was lower than expected for a single, dominant gene. In the F 2 , 26.7% of the resistant plants were homozygous for resistance. Selfed progeny from monosomic and disomic F 1 plants from crosses between the translocation line and monosomics for 6A and 6B segregated with frequencies similar to normal F 2 progeny but the progeny of monosomics for 6D were primarily resistant (93.2%). Crosses between the translocation line and chromosome 6D telocentrics and studies of four enzymes that are encoded by genes on the group 6 homoeologous chromosomes showed that the translocated chromosome consists of the q arm of chromosome 6D of 'Rescue' and the p arm of chromosome 6 of A. elongatum. Because the new stock was derived from a double monosomic, the translocation was probably a Robertsonian fusion of misdivided centromeres. The resistance is being backcrossed into winter wheat.Key words: Agropyron elongatum, Thinopyron, Elytrigia, Lophopyrum, Robertsonian translocation, isozyme structural genes, wheat curl mite.
Publication Year: 1988
Publication Date: 1988-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 55
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