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Resistance of Triticum dicoccoides Collected in Israel to Infection with Puccinia recondita tritici¹

Triticum dicoccoides (Koern. ex Aschers. and Graebn.) Aaronsohn, a progenitor of hexaploid wheat (Triticum aestivum L.) and tetraploid wheat (Triticum turgidum L. var. durum), grows wild in many sites in Israel. Reactions were determined of 687 accessions of T. dicoccoides from that country to infection with culture PRTUS6 of Puccinia recondita Rob. ex Desm. f. sp. tritici, which incites the disease wheat leaf rust. Fourteen percent (or 98 accessions) were at least moderately resistant in the first-leaf stage to infection with culture PRTUS6. Nineteen of 34 accessions collected at site 12 were moderately resistant as were 10 of 35 from Site 2 and four of nine from Site 8. Resistant accessions were obtained in low frequencies from Sites 6 and 7. Resistant and moderately resistant accessions were obtained among 353 accessions collected at approximately 180 sites throughout the region from Upper and Lower Galilee, Mt. Gilboa and the Judean Mountains, and Mt. Hermon and the Golan Heights. Additional resistant and moderately resistant accessions of T. dicoccoides could probably be obtained by collecting from additional sites. The resistant accessions identified in this study are being used to develop enhanced hexaploid and tetraploid wheat germplasm resistant to P. recondita tritici, Erysiphe graminis DC. ex Merat. f. sp. tritici (Em. Marchal), and P. stri-iformis West.

Key Words: Wheat • Leaf rust • Germplasm • Disease

² Research plant pathologist, USDA-ARS, Plant Genetics and Germplasm Inst., Beltsville Aerie. Res. Ctr., Beltsville, MD 20705; professor, Inst. of Evolution, Univ. of Haifa, Haifa 31-999, Israel; plant pathologist, Agric. Res. Organization, The Volcani Ctr., Bet pagan 50-250, Israel; professor, Dep. of Agronomy, Univ. of Assiut, Assiut, Egypt; and professor, Dep. of Genetics, Hebrew Univ., Jerusalem, Israel.

Received for publication August 29, 1983.