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Resistance to the root-lesion nematode Pratylenchus thornei of Iranian landrace wheat

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Abstract

Pratylenchus thornei is widespread throughout the wheat-growing regions in Australia and overseas and can cause yield losses of up to 70% in some intolerant cultivars. The most effective forms of management of P. thornei populations are crop rotation and plant breeding. There have been no wheat accessions identified as completely resistant to P. thornei, therefore breeding programs have used moderately resistant parents. The objective of the present research was to evaluate 274 Iranian landrace wheats for resistance to P. thornei and identify accessions with resistance superior to the current best resistance source (GS50a). Plants were grown in P. thornei inoculated soil under controlled conditions in a glasshouse pot experiment for 16 weeks. Ninety-two accessions found to be resistant or moderately so were retested in a second experiment. From combined analysis of these experiments, 34 accessions were identified as resistant with reproduction factors (final population per kg soil/initial inoculum rate per kg soil) ≤1. In total, 25 accessions were more resistant than GS50a, with AUS28470 significantly (P<0.05) more resistant. The resistant Iranian landraces identified in the present study are a valuable untapped genetic pool offering improved levels of P. thornei resistance over current parents in Australian wheat-breeding programs.

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  1. Leslie Research Centre, Queensland Primary Industries and Fisheries, Department of Employment, Economic Development and Innovation, PO Box 2282, 4350, Toowoomba, Qld, Australia

    J. G. Sheedy & J. P. Thompson

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  1. J. G. Sheedy
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  2. J. P. Thompson
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Correspondence to J. G. Sheedy.

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Sheedy, J.G., Thompson, J.P. Resistance to the root-lesion nematode Pratylenchus thornei of Iranian landrace wheat. Australasian Plant Pathology 38, 478–489 (2009). https://doi.org/10.1071/AP09030

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