Survival of root-lesion nematode Pratylenchus neglectus during progressive soil desiccation after growth of wheat in a vertisol

Thompson, J. P. and Rostad, H. E. and Whish, J. P. M. (2017) Survival of root-lesion nematode Pratylenchus neglectus during progressive soil desiccation after growth of wheat in a vertisol. Biology and Fertility of Soils, 53 (3). pp. 357-366. ISSN 0178-2762

Abstract

Whether soil desiccation causes a fall in peak population abundances of Pratylenchus neglectus after wheat growth was investigated by drying a vertisol through a range of moisture contents (MC) by both fast and slow drying methods. Live nematodes were then extracted for 2 and 7 days and counted in four life stages(adult and juvenile stages J2,J3 and J4). The population of P. neglectus declined more steeply with decreasing soil moisture content from fast drying than from slow drying. These trends were modelled by regression equations. Upon desiccation of the soil from an initial 64.4% MC to the plant permanent wilting point(31.5%MC),48% of the nematodes survived after fast drying, but 86% survived after slow drying. With further desiccation to 21% MC only 23% of the P. neglectus population survived after fast drying, whereas 81% of the population survived after slow drying. On continued drying, the fast dried soil was at 11.9% MC after 7 days with virtually no surviving P. neglectus, whereas the slowly dried soil reached 16.5% MC after 8 days with 79% surviving. The P. neglectus population declined by 2.2 and 0.5% per 1% loss of soil moisture for fast and slow drying, respectively. With fast drying, all life stages declined; however, with slow drying, only the J2 stage declined with 44% surviving at 16.5% MC. This information can be applied to crop growth modelling, to extraction techniques for soil from the glasshouse and field, and to consideration of whether molecular methods measure DNA from recently dead nematodes killed by soil desiccation in the field giving an overestimation of the number of live nematodes.


Statistics for USQ ePrint 33189
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with publisher's copyright policy.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 24 Jan 2018 06:10
Last Modified: 02 May 2018 01:40
Uncontrolled Keywords: Anhydrobiosis; Pratylenchus neglectus; root-lesion nematode; nematode population dynamics; soil desiccation; wheat
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Funding Details:
Identification Number or DOI: 10.1007/s00374-017-1184-2
URI: http://eprints.usq.edu.au/id/eprint/33189

Actions (login required)

View Item Archive Repository Staff Only