|Ohm, Herb - PURDUE UNIV. AGRONOMY|
Submitted to: Plant and Animal Genome
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 2002
Publication Date: N/A
Technical Abstract: A nearly complete set of hexaploid wheat 'Chinese Spring' x wheatgrass (Lophopyrum elongata) disomic substitution lines was used to characterize the effects of alien chromosomes in a standardized wheat background. Each wheatgrass chromosome was represented three times, once each for the A, B, and D genomes. Each substitution line exhibited traits contributed by the alien chromosome as well as traits affected by deletion of a homologous wheat chromosome. Molecular markers confirmed the presence of wheatgrass chromatin in the 19 (out of 21 possible) substitution lines studied. Days to anthesis were affected by the chromosome substitutions. Plant heights varied from 0.5 to 1 meter for groups 2 and 5 substitution lines, respectively. The group 7 substitution lines and wheatgrass had reddish-brown coleoptiles, and the 6B substitution line developed awns on the spike. All lines were also screened for resistance to barley yellow dwarf virus (BYDV), cereal yellow dwarf virus (CYDV), powdery mildew, Hessian fly, fusarium head blight, and septoria tritici blotch of wheat. A significant reduction in BYDV titer was noted in 2B and 2D substitution lines compared to 'Chinese Spring'. In addition, CYDV titer was reduced in 1B, 2A, 2B, 2D, 3A, 3B, 3D, and 6B substitution lines compared to 'Chinese Spring'. All of the lines were susceptible to Hessian fly biotype L and to powdery mildew. The groups 1 and 7 substitution lines had excellent type II resistance to fusarium head blight. Preliminary data for septoria tritici blotch indicated an increased resistance in some of the substitution lines.