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Tolerance of wheat cultivars to root-lesion nematode (Pratylenchus thornei) assessed by normalised difference vegetation index is predictive of grain yield

Robinson, N. A., Sheedy, J. G., MacDonald, B. J., Owen, K. J. and Thompson, J. P. (2019) Tolerance of wheat cultivars to root-lesion nematode (Pratylenchus thornei) assessed by normalised difference vegetation index is predictive of grain yield. Annals of Applied Biology, 174 (3). pp. 388-401. ISSN 0003-4746

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Article Link(s): https://doi.org/10.1111/aab.12504

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/aab.12504

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 R2 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 (R2 = 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.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Greenseeker normalised difference vegetation index Pratylenchus thornei tolerance wheat yield loss
Subjects:Science > Botany > Genetics
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Field crops > Wheat
Plant pests and diseases
Deposited On:17 Apr 2019 06:00
Last Modified:02 Sep 2019 06:03

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