Temperature response of root-lesion nematode (Pratylenchus thornei) reproduction on wheat cultivars has implications for resistance screening and wheat production

Thompson, J. P. and Clewett, T. G. and O'Reilly, M. M. (2015) Temperature response of root-lesion nematode (Pratylenchus thornei) reproduction on wheat cultivars has implications for resistance screening and wheat production. Annals of Applied Biology, 167 (1). pp. 1-10. ISSN 0003-4746

Abstract

The root-lesion nematode Pratylenchus thornei is a major pathogen of wheat and other field crops, particularly in the northern grain region of sub-tropical eastern Australia. Research was conducted into the temperature requirements of P. thornei for reproduction on wheat to increase the reliability of selection in resistance tests for wheat breeding. Final population densities (Pf) of P. thornei were determined on four wheat cultivars (Gatcher, GS50a, Potam and Suneca) at fortnightly intervals from 8 to 18 weeks at a range of six soil temperatures (15, 20, 22.5, 25, 27.5 and 30 ºC) in a glasshouse experiment. Pratylenchus thornei had the highest Pf in the temperature range 20–25 ºon all wheat cultivars at all growth times after sowing, with no nematode reproduction measured at 30ºC and very little at 15ºC. The wheat cv. GS50a consistently produced lower Pf than cvs Gatcher, Potam and Suneca in the optimum temperature range 20–25ºC. In carrot disc cultures, P. thornei had an optimum temperature of 25ºC with little reproduction at 17.5ºC and none detectable at 30ºC. A standard soil temperature of 23ºC was chosen to maximise differences in nematode reproduction between resistant and susceptible wheat genotypes for selection in wheat breeding, and to improve reproducibility among successive experiments. The relationships derived from these experiments will be valuable for simulation of P. thornei reproduction in crop growth models. They also indicate that early sowing of wheat into cool soil (≤15ºC) in farmers’ fields of the northern grain region should favour wheat growth over nematode reproduction and increase grain yield.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published Version due to publisher's copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 23 Dec 2015 04:16
Last Modified: 06 Feb 2018 04:12
Uncontrolled Keywords: Pratylenchus thornei; root-lesion nematode; temperature requirements, Triticum aestivum; wheat breeding
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Funding Details:
Identification Number or DOI: 10.1111/aab.12187
URI: http://eprints.usq.edu.au/id/eprint/28234

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