|Sardesa, Nagesh - PURDUE UNIVERSITY|
Submitted to: Annual International Plant & Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: November 3, 2002
Publication Date: January 11, 2003
Citation: Williams, C.E., Collier, C.C., Sardesa, N. 2003. New hessian fly resistance gene in wheat, h31, maps to the distal end of chromosome 5bs. In: Proceedings of the Annual International Plant & Animal Genome Conference. Plant and Animal Genomes XII Symposium, January 10-14, 2004, San Diego, California. 11(380):169. Available: http://www.intl-pag.org/11/abstracts/P5c_P380_XI.html Technical Abstract: Introgression of resistance genes from unadapted lines is currently the most effective and economical control method to combat Hessian fly infestations in cultivated wheat. New virulent fly genotypes emerge as a response to selection pressure imposed by wide-spread use of resistant cultivars. As a result, constant monitoring and release of novel sources of resistance are needed to maintain protection for the wheat crop. A new source of resistance to the highly virulent and pervasive Hessian fly biotype L was identified in an accession of tetraploid durum wheat and introgressed into hexaploid bread wheat. Classical genetic analysis revealed that this line contained a single dominant locus for resistance, now called H30. Tightly-linked sequence-tagged site markers were developed for the gene. Through genetic mapping with the ITMI population (recombinant inbred lines from the cross Synthetic X Opata) and physical deletion mapping, these H30-linked markers have been localized to the distal end of the short arm of chromosome 5B. H30 is the first Hessian fly resistance gene to be mapped to 5BS, and thus is a new locus that is not allelic to previously identified Hessian fly-resistance genes. The markers are being used to track the introgression of H30 into a cultivar containing multiple sources for Hessian fly resistance as a possible strategy for extending the durable resistance of deployed wheat cultivars.