Tolerance of wheat cultivars to root-lesion nematode (Pratylenchus thornei) assessed by Normalised Difference Vegetation Index (NDVI) is predictive of grain yield

Robinson, Neil A. and Sheedy, Jason G. and Macdonald, Bethany J. and Owen, Kirsty J. and Thompson, John P. (2019) Tolerance of wheat cultivars to root-lesion nematode (Pratylenchus thornei) assessed by Normalised Difference Vegetation Index (NDVI) is predictive of grain yield. Annals of Applied Biology, 174 (3). pp. 388-401. ISSN 0003-4746

Abstract

Tolerant wheat cultivars yield well when sown in fields infested with the root-lesion nematode Pratylenchus thornei, which is present in 67% of fields in the subtropical grain region of eastern Australia. Wheat breeding programmes require accurate phenotyping to select germplasm with superior tolerance to P. thornei. This study investigated normalised difference vegetation index (NDVI) as a phenotypic tool to predict the tolerance of wheat cultivars on low and high P. thornei population densities. Three, 2-year field experiments used a resistant and a susceptible wheat cultivar in the first year to develop low and high P. thornei populations. In the second year, 36 wheat cultivars were sown on these plots. A NTech Greenseeker was used to determine the NDVI of each plot at regular times during the season and grain yield was measured at crop maturity. There was an inverse relationship between P. thornei population densities and the NDVI for intolerant wheat cultivars. Regression analysis showed a highly predictive response between the yield tolerance index and NDVI with R 2 ranging from 0.85 (n = 36) to 0.93 (n = 36) for the three experiments. The area under the disease progress curve with respect to NDVI was highly predictive of yield tolerance (R 2 = 0.92; n = 36) when there were high populations (9,091 P. thornei/kg), but not when populations were low (578 P. thornei/kg). Tolerant cultivars can be identified by NDVI when sown on soil containing high populations (>2,500 P. thornei/kg) by measurement at approximately 1,000 degree days after sowing. Greenseeker is a valuable tool for wheat breeders to select germplasm with tolerance of P. thornei.


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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, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 04 Jul 2019 01:43
Last Modified: 20 Nov 2019 05:15
Uncontrolled Keywords: Greenseeker, normalised difference vegetation index, Pratylenchus thornei tolerance, wheat, yield loss
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: 10.1111/aab.12504
URI: http://eprints.usq.edu.au/id/eprint/36583

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