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Title: RESISTANCE OF TANGMAI 4 WHEAT TO POWDERY MILDEW, STEM RUST, LEAF RUST, AND STRIPE RUST AND ITS CHROMOSOMAL COMPOSITION

Author
item LI, H - CHINESE ACADEMY OF AG
item CONNOR, R - AG & AGRI-FOOD CANADA
item MCCALLUM, B - AG & AGRI-FOOD CANADA
item Chen, Xianming
item SU, H - CHINESE ACADEMY OF AG
item WEN, Z - HEBEI ACADEMY OF AG
item CHEN, Q - LETHBRIDGE RES CTR
item JIA, X - CHINESE ACADEMY OF SCI

Submitted to: Canadian Journal of Plant Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/9/2004
Publication Date: 10/1/2004
Citation: Li, H.J., Connor, R.L., Mccallum, B.D., Chen, X., Su, H., Wen, Z.Y., Chen, Q., Jia, X. 2004. Resistance of tangmai 4 wheat to powdery mildew, stem rust, leaf rust, and stripe rust and its chromosomal composition. Canadian Journal of Plant Science. 84:1015-1023.

Interpretive Summary: Effective resistance to US and Canadian isolates of stripe rust, leaf rust, stem rust and powdery mildew was found in Chinese hard red winter wheat variety Tangmai 4. Cytogenetic and molecular techniques were used to determine chromosomal composition of the resistant variety. The results show that the resistant variety had a part of a rye chromosome that is present in many other wheat varieties. Since the resistance genes from rye are no longer effective against stripe rust, leaf rust, stem rust and powdery mildew, Tangmai 4 should have additional resistance genes, by themselves or in combination with the genes from rye, conferring the effective resistance. Tangmai 4 should be a valuable source for resistance against multiple diseases.

Technical Abstract: The hard red winter wheat Tangmai 4 did not develop symptoms of infection following inoculation with powdery mildew (Erysiphe graminis DC. f. sp. tritici E. Marchal) isolates from regions of western Canada and northern China. Tangmai 4 exhibited resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.) and leaf rust (P. triticina Eriks.) races from western Canada. This wheat line was resistant to individual stripe rust (P. striiformis Westend. f. sp. tritici Eriks.) races from the U.S. and Canada. Sequential C-banding and genomic in situ hybridization (GISH), and electrophoretic analyses of high molecular weight glutenins and gliadins demonstrated that Tangmai 4 carried a pair of T1BL'1RS wheat-rye (Secale cereale L.) chromosomes.