Optimising initial population density, growth time and nitrogen nutrition for assessing resistance of wheat cutivars to root-lesion nematode (Pratylenchus thornei)
Article
Article Title | Optimising initial population density, growth time and nitrogen nutrition for assessing resistance of wheat cutivars to root-lesion nematode (Pratylenchus thornei) |
---|---|
ERA Journal ID | 2559 |
Article Category | Article |
Authors | Thompson, J. P. (Author), Clewett, T. G. (Author) and O'Reilly, M. M. (Author) |
Journal Title | Australasian Plant Pathology |
Journal Citation | 44 (2), pp. 133-147 |
Number of Pages | 15 |
Year | 2015 |
Publisher | Springer |
Place of Publication | Dordrecht, Netherlands |
ISSN | 0815-3191 |
1448-6032 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s13313-015-0347-6 |
Web Address (URL) | http://link.springer.com/article/10.1007%2Fs13313-015-0347-6 |
Abstract | Pratylenchus thornei is a major pathogen of wheat in Australia. Two glasshouse experiments with four wheat cultivars that had different final populations (Pf) of P. thornei in the field were used to optimise conditions for assessing resistance. With different initial populations (Pi) ranging up to 5250 P. thornei/kg soil, Pf of P. thornei increased to 16 weeks after sowing, and then decreased at 20 weeks in some cultivar x Pi combinations. The population dynamics of P. thornei up to 16 weeks were best described by a modified exponential equation Pf(t) = aP ie kt where Pf(t) is the final population density at time t, Pi is the initial population density, a is the proportion of Pi that initiates population development, and k is the intrinsic rate of increase of the population. The cultivar GS50a had very low k values at Pi of 5250 and 1050 indicating its resistance, Suneca and Potam had high k values indicating susceptibility, whereas intolerant Gatcher had a low value at the higher Pi and a high value at the lower Pi. Nitrate fertiliser increased plant growth and Pf values of susceptible cultivars, but in unplanted soil it decreased Pf. Nematicide (aldicarb 5 mg/kg soil) killed P. thornei more effectively in planted than in unplanted soil and increased plant growth particularly in the presence of N fertiliser. In both experiments, the wheat cultivars Suneca and Potam were more susceptible than the cultivar GS50a reflecting field results. The method chosen to discriminate wheat cultivars was to assess Pf after growth for 16 weeks in soil with Pi~1050–5250 P. thornei/kg soil and fertilised with 200 mg NO3–N/kg soil. |
Keywords | nematode population density, growing time, nitrogen nutrition, vertosols, modified exponential growth curve |
ANZSRC Field of Research 2020 | 310407. Host-parasite interactions |
300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Crop Health |
Department of Agriculture, Fisheries and Forestry, Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2z3q/optimising-initial-population-density-growth-time-and-nitrogen-nutrition-for-assessing-resistance-of-wheat-cutivars-to-root-lesion-nematode-pratylenchus-thornei
1626
total views7
total downloads1
views this month0
downloads this month