GENETICS OF LEAF RUST RESISTANCE IN CANADIAN SPRING WHEATS AC DOMAIN AND AC TABER

Authors
Citation
Jq. Liu et Ja. Kolmer, GENETICS OF LEAF RUST RESISTANCE IN CANADIAN SPRING WHEATS AC DOMAIN AND AC TABER, Plant disease, 81(7), 1997, pp. 757-760
Citations number
20
Categorie Soggetti
Plant Sciences
Journal title
ISSN journal
01912917
Volume
81
Issue
7
Year of publication
1997
Pages
757 - 760
Database
ISI
SICI code
0191-2917(1997)81:7<757:GOLRRI>2.0.ZU;2-5
Abstract
The hard red spring wheat cultivar AC Domain and the Canada Prairie Sp ring wheat AC Taber have recently been licensed and released in wester n Canada and are resistant to leaf rust caused by Puccinia recondita f . sp. tritici. To determine the genetic basis of this resistance, the two cultivars were crossed with the leaf rust susceptible wheat Thatch er (Tc), and F-1 plants were backcrossed to Thatcher. F-2 families fro m Tc2/AC Domain and AC Taber/Tc*2 were tested with isolates of P. rec ondita f. sp. tritici as seedlings in the greenhouse and as adults in the field rust nursery. Segregation of BC1F2 families indicated that A C Domain had seedling resistance genes Lr10 and Lr16, and the adult pl ant gene Lr34. AC Domain was also hypothesized to have the adult plant gene Lr12 based on infection types with I! recondita f. sp. tritici i solates that differed for virulence to Lr12. The effective field leaf rust resistance of AC Domain was conditioned by Lr16 and Lr34. Segrega tion of BC1F2 families and infection types of BC1F3-derived BC1F4 plan ts indicated that AC Taber had Lr14a for seedling resistance, the adul t plant gene Lr13, plus an additional uncharacterized adult plant resi stance gene currently designated as LrTb.