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Title: INHERITANCE AND MECHANISMS OF RUSSIAN WHEAT APHID (RWA) RESISTANCE IN WHEAT PI 245462

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

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/29/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Studies were conducted to determine the inheritance and mechanisms of RWA resistance in a winter wheat line selected out of PI 245462. Crosses were made between the resistant line and susceptible wheat cultivar 'Chisholm'. F1, F2, and F3 progeny were artificially infested with RWA in the greenhouse. F1 data indicated that resistance is dominant with no evidence of cytoplasmic effects. F2 and F3 data show that resistance in this line i controlled by two dominant genes; the F2 showed a 15R or MR:1S segregation ratio, and F3 lines segregated in a 15R or Seg:1 all S ratio. Antixenosis (nonpreference) was not present in this line. There were significant differences between the resistant line and the susceptible check with regard to both antibiosis and tolerance to the aphid. Antibiosis to RWA appears to be the most important mechanism of resistance present in this line.