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ARS Home » Research » Publications at this Location » Publication #72596
Title: IDENTIFICATION OF GENETIC DIVERSITY FOR RUSSIAN WHEAT APHID RESISTANCE IN WHEAT

Author
item Baker, Cheryl
item Porter, David
item Webster, James

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/3/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary: Summary article; no new research reported; no interpretive summary required.

Technical Abstract: There is a good deal of conflicting evidence in the literature concerning the inheritance and gene designations of Russian wheat aphid (RWA) resistance genes in wheat. In an attempt to integrate the various conflicting reports, an analysis was done on all possible intercrosses made between four different RWA-resistant lines: PI's 137739, 262660, 294994, and 372129. Due to the difficulties associated with identifying multiple genes in moderately sized segregating F2 populations, an alternative model was used to develop the populations of interest; once the resistant lines were intercrossed, the intercross F1's were grown and topcrossed with a susceptible cultivar. Populations consisting of 50 plants derived from each intercross/topcross combination were grown and allowed to self. Progeny tests were then conducted to determine the number of homozygous susceptible plants that were present in each topcross population. This number should indicate the number of genes in action as well as whether or not the different lines have any genes in common. Results will be discussed.