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Title: INHERITANCE AND MECHANISMS OF RUSSIAN WHEAT APHID (HOMOPTERA: APHIDIDAE) RESISTANCE IN PI 225217

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

Submitted to: Hard Red Winter Wheat Workers Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 11/1/1996
Publication Date: N/A
Citation: N/A

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

Technical Abstract: Studies were conducted to determine the inheritance and mechanisms of RWA resistance in a red winter wheat line selected out of PI 225217. 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 is controlled by a single gene; the F2 showed a 2R:1S segregation ratio, and F3 lines segregated in a 1R:2 Seg:1S ratio. Antibiosis and preference tests indicated that the resistant line was not significantly different from the susceptible check beyond the one-leaf stage. The tolerance tests indicated that the resistant line was significantly more tolerant to RWA feeding than the susceptible check for all parameters tested. Therefore, tolerance to RWA appears to be the most important mechanism of resistance present in this line.