Summary
All crosses, except for reciprocals, were made among ten cultivars originating from crop improvement programs in North Africa and the Middle East. The entries varied widely in reaction to Septoria tritici. F1 and F2 progenies of the crosses were evaluated using eight S. tritici isolates from seven countries in the Mediterranean area. Thus, sixteen separate combining ability analyses were excecuted. General combining ability (GCA) was the major component of variation, although specific combining ability (SCA) was present in most cases. Additive variance thus appears to be of predominant importance. Nevertheless, non-additive variance may interfere when line selection in a breeding program is practiced. While differing greatly among cultivars, specific GCA effects for each cultivar separately were of similar magnitude for all isolates. Ranking statistics determined that cultivars were ranked in similar order for both means and specific GCA effects independent of the isolate used. Different isolates may therefore interact with similar or identical genetically controlled mechanisms in a particular cultivar. This could indicate the absence of differential gene-for-gene relationships and suggests that isolates vary in aggressiveness rather than in virulence.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Auld D.L., Adams K.J., Swensen J.B. & Murray G.A. 1983. Diallel analyses of winterhardiness in peas. Crop Sci. 23: 763–766.
Baker R.J. 1978. Issues in diallel analysis. Crop Sci. 18: 533–536.
Dubin H.J. & Rajaram S. 1981. The strategy of the International Maize and Wheat Improvement Center (CIMMYT) for breeding disease resistant wheat: an international approach. Pages 27–35. In: Strategies for the Control of Cereal Disease. J.F. Jenkyn & R.T. Plumb, eds. Blackwell Scientific Publications, Oxford, London, Edinburgh, Boston and Melbourne. 219 pp.
Eyal Z. 1972. Effect of Septoria leaf blotch on the yield of spring wheat in Israel. Plant Dis. Rep. 56 (11): 983–986.
Eyal Z., Amiri Z. & Wahl I. 1973. Physiologic specialization of Septoria tritici. Phytopathology 63: 1087–1091.
Eyal Z. & Scharen A.L. 1977. A quantitative method for the inoculation of wheat seedlings with pycnidiospores of Septoria nodorum. Phytopathology 67 (5): 712–714.
Eyal Z. 1981. Integrated control of Septoria diseases of wheat. Plant Dis. 65 (9): 763–768.
Eyal Z., Scharen A.L., Huffman M.D. & Prescott J.M. 1985. Global insights into virulence frequencies of Mycosphaerella graminicola. Phytopathology 75 (12): 1456–1462.
Gardner C.O. & Eberhart S.A. 1966. Analysis and interpretation of the variety cross diallel and related populations. Biometrics 22, p. 439–452.
Gouth, F.J. 1976. The effect of Septoria leaf blotch on root development of wheat. Page 48. In: Proc. of the Septoria diseases of wheat workshop, May 4–6, 1976. Experiment, GA. Edited by B.M. Cunfer & L.R. Nelson. GA. Ag. Exp. Sta. Spec. Pub. No. 4. 69 pp.
Krupinsky, J.M. 1976. Techniques for screening wheat for Septoria resistance. p. 28–33. In: Proc. of the Septoria diseases of wheat workshop, May 4–6, 1976, Experiment, GA. Edited by B.M. Cunfer & L.R. Nelson. GA. Ag. Exp. Sta. Spec. Pub. No. 4. 69 pp.
Krupinsky J.M., Craddock J.C. & Scharen A.L. 1977. Septoria resistance in wheat. Plant Dis. Rep. 61 (8): 632–636.
Matzinger D.F. & Kempthorne O. 1956. The modified diallel table with partial inbreeding and interactions with environment. Genetics 41: 822–833.
Saari, E.E. 1974. Results of studies on Septoria in the Near East and Africa. Pages 275–283. In: Proc. of Fourth FAO/Rockefeller Foundation Wheat Seminar. Tehran, Iran, 21 May–2 June 1973. 441 pp.
Shipton W.A., Boyd W.J.R., Rosielle A.A. & Shearer B.L. 1971. The Common Septoria Diseases of Wheat. Bot. Rev. 37 (2). pp. 231–262.
Sokol M.J. & Baker R.J. 1977. Evaluation of the assumptions required for the genetic interpretation of diallel experiments in self-pollinating crops. Can. J. Plant Sci. 57: 1185–1191.
Sprague G.F. & Tatum L.A. 1942. General vs. specific combining ability in single crosses of corn. J. Am. Soc. Agron. 34: 923–932.
Van Der Plank J.E. 1968. Disease Resistance in Plants. Academic Press, N.Y. 201 pp.
Van Ginkel, M. & Scharen, A.L. 1987a. Generation mean analysis and heritabilities of resistance to Septoria tritici in durum wheat. Phytopathology 77: (in press).
Van Ginkel, M. & Scharen, A.L. 1987b. Host-pathogen relationships of wheat and Septoria tritici. Phytopathology 77: (in press).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
van Ginkel, M., Scharen, A.L. Diallel analysis of resistance to Septoria tritici isolates in durum wheat. Euphytica 38, 31–37 (1988). https://doi.org/10.1007/BF00024808
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00024808