Back-cross reciprocal monosomic analysis of Fusarium head blight resistance in wheat (Triticum aestivum L.) |
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Authors: | H Buerstmayr M Lemmens G Fedak P Ruckenbauer Communicated B S Gill |
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Institution: | (1) Institute for Agrobiotechnology, Department of Biotechnology in Plant Production, Konrad Lorenz Strasse. 20, A-3430 Tulln, Austria Fax: +43 2272 66280 77 E-mail: buerst@ifa1.boku.ac.at, AT;(2) Plant Research Centre, Central Experimental Farm, Ottawa, K1A 0C6, Ontario, Canada, CA |
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Abstract: | Fusarium head blight (FHB or scab) caused by Fusarium spp. is a widespread disease of cereals causing yield and quality losses and contaminating cereal products with mycotoxins. The
breeding of resistant varieties is the method of choice for controlling the disease. Unfortunately, the genetic basis of scab
resistance is still poorly understood. We present the results of a back-cross reciprocal monosomic analysis of FHB resistance
using the highly resistant Hungarian winter wheat line ‘U-136.1’ and the highly susceptible cultivar ‘Hobbit-sib’. Resistance
testing was performed in a field trial artificially inoculated with a Fusarium culmorum conidial suspension. Five hemizygous families containing ‘U-136.1’ chromosomes 6B, 5A, 6D, 1B, and 4B had a visually reduced
spread of infection compared to lines having the ‘Hobbit-sib’ chromosome. Chromosome 2B from ‘U-136.1’ had an increased spread
of infection. The critical chromosomes controlling seed weight were 6D, 3B, 5A, and 6B while those controlling deoxynivalenol
(DON) content were homoeologous groups 2 and 6, although the latter effects were not significant due to a high coefficient
of variation. Results from this and other studies show that chromosomes 6D, 6B, 5A, 4D, and 7A have frequently been associated
with scab resistance in a number of wheat cultivars. Research groups now attempting to map scab resistance in wheat using
markers should pay special attention to the above-mentioned chromosomes.
Received: 31 March 1998 / Accepted: 14 July 1998 |
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Keywords: | Fusarium culmorum Scab Wheat Resistance Chromosome Monosomic analysis |
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