Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/6/2004
Publication Date: 10/30/2004
Citation: Oliver, R.E., Cai, X., Xu, S.S., Stack, R.W., Jin, Y. 2004. Fusarium head blight reaction and cytogenetic characterization of four wheat-thinopyrum ponticum amphiploids. Agronomy Abstracts.[abstract]. In: Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, SSSA, Madison, WI. Oct. 31-Nov. 4, 2004. Seattle, WA.
Technical Abstract: Fusarium head blight (FHB), caused mainly by Fusarium graminearum, is a destructive disease of wheat and a serious threat to wheat production worldwide. Genetic resistance of the host plant is considered the most effective method of combating the disease; however, the lack of resistance sources in wheat has hindered the development of wheat cultivars with satisfactory levels of resistance. Alien species represent a promising source of resistance to FHB and have been used to develop wheat cultivars with improved resistance to numerous other pathogens. We have identified four wheat-Thinopyrum ponticum derivatives that have exhibited FHB reactions comparable to Sumai 3, the most widely used source of FHB resistance. Evaluation of resistance was conducted over two greenhouse seasons using the point inoculation method. Fluorescence genomic in situ hybridization (FGISH) patterns of mitotic chromosomes indicate that these four derivatives are partial wheat-Th. ponticum amphiploids, each with a total of 56 chromosomes, though with varied amounts of Th. ponticum chromatin. Hybridization between these four amphiploids was made to determine homology between the Th. ponticum chromosomes in each of the amphiploids using FGISH. The Th. ponticum chromatin conferring FHB resistance is being transferred from these amphiploids to cultivated wheat.