Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi

M.G. Teklu, T.H. Been, C.H. Schomaker

Research output: Chapter in Book/Report/Conference proceedingAbstractAcademic

Abstract

Four potato genotypes with a single resistant gene against M. chitwoodi were examined for their degree of relative susceptibility compared to the susceptible cv. Désirée. The potato genotypes were grown in 10-liter pots in artificial soil at a range of initial nematode densities (Pi) from 0 (control), 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64 to 128 juveniles (gram of dry soil)-1. The pot experiment was carried out in a climate controlled glasshouse. The final population density (Pf) and various plant characteristics such as plant height, fresh and under water weight of tubers, fresh root weight, shoot and root dry weight were measured and related to initial nematode density to model yield. Additionally, the root-knot index (RKI) of the tubers was assessed. Plant height was found to increase with nematode densities in all the genotypes. The rootknot index (RKI) score was below 10 for all resistant tested genotypes, which is below the minimum threshold for industrial processing when potato supply is abundant. By comparison, the susceptible cultivar Désirée scored above the maximum threshold when supply is low. Yield, expressed as relative total fresh weight, under water weight and percentage of starch dry matter of tubers, was found to be independent of the initial nematode densities in one genotype and reduced in the three other genotypes with an increase in Pi. Models of estimates of final population dynamics of M. chitwoodi on the resistant genotypes made so far, were all below the equilibrium line (Pi = Pf); their maximum values at the highest Pi were smaller or equal to 0.1 juveniles (gram of dry soil)-1. The tested genotypes proved to be highly resistant. This research is part of a greater research project testing both methodology and population dynamical models in order to downscale and develop a cheap, reliable and consistent method for routine resistance testing. From the results so far, the relative maximum Pf value, maximum population density (“M”) at high initial Pi seems to be a good parameter to indicate degree of resistance. Key words: Screening resistance, population dynamics, and maximum population density.
Original languageEnglish
Title of host publication64th International Symposium on Crop Protection, Gent, 22-05-2012
Place of PublicationGhent, Belgium
Pages124-124
Publication statusPublished - 2012
Event64th International Symposium on Crop Protection -
Duration: 22 May 201222 May 2012

Conference

Conference64th International Symposium on Crop Protection
Period22/05/1222/05/12

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Meloidogyne chitwoodi
potatoes
genotype
genes
Nematoda
tubers
population density
population dynamics
soil
plant characteristics
knots
processing technology
starch
screening
greenhouses
climate
shoots
cultivars
methodology

Cite this

Teklu, M. G., Been, T. H., & Schomaker, C. H. (2012). Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi. In 64th International Symposium on Crop Protection, Gent, 22-05-2012 (pp. 124-124). Ghent, Belgium.
Teklu, M.G. ; Been, T.H. ; Schomaker, C.H. / Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi. 64th International Symposium on Crop Protection, Gent, 22-05-2012. Ghent, Belgium, 2012. pp. 124-124
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abstract = "Four potato genotypes with a single resistant gene against M. chitwoodi were examined for their degree of relative susceptibility compared to the susceptible cv. D{\'e}sir{\'e}e. The potato genotypes were grown in 10-liter pots in artificial soil at a range of initial nematode densities (Pi) from 0 (control), 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64 to 128 juveniles (gram of dry soil)-1. The pot experiment was carried out in a climate controlled glasshouse. The final population density (Pf) and various plant characteristics such as plant height, fresh and under water weight of tubers, fresh root weight, shoot and root dry weight were measured and related to initial nematode density to model yield. Additionally, the root-knot index (RKI) of the tubers was assessed. Plant height was found to increase with nematode densities in all the genotypes. The rootknot index (RKI) score was below 10 for all resistant tested genotypes, which is below the minimum threshold for industrial processing when potato supply is abundant. By comparison, the susceptible cultivar D{\'e}sir{\'e}e scored above the maximum threshold when supply is low. Yield, expressed as relative total fresh weight, under water weight and percentage of starch dry matter of tubers, was found to be independent of the initial nematode densities in one genotype and reduced in the three other genotypes with an increase in Pi. Models of estimates of final population dynamics of M. chitwoodi on the resistant genotypes made so far, were all below the equilibrium line (Pi = Pf); their maximum values at the highest Pi were smaller or equal to 0.1 juveniles (gram of dry soil)-1. The tested genotypes proved to be highly resistant. This research is part of a greater research project testing both methodology and population dynamical models in order to downscale and develop a cheap, reliable and consistent method for routine resistance testing. From the results so far, the relative maximum Pf value, maximum population density (“M”) at high initial Pi seems to be a good parameter to indicate degree of resistance. Key words: Screening resistance, population dynamics, and maximum population density.",
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Teklu, MG, Been, TH & Schomaker, CH 2012, Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi. in 64th International Symposium on Crop Protection, Gent, 22-05-2012. Ghent, Belgium, pp. 124-124, 64th International Symposium on Crop Protection, 22/05/12.

Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi. / Teklu, M.G.; Been, T.H.; Schomaker, C.H.

64th International Symposium on Crop Protection, Gent, 22-05-2012. Ghent, Belgium, 2012. p. 124-124.

Research output: Chapter in Book/Report/Conference proceedingAbstractAcademic

TY - CHAP

T1 - Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi

AU - Teklu, M.G.

AU - Been, T.H.

AU - Schomaker, C.H.

PY - 2012

Y1 - 2012

N2 - Four potato genotypes with a single resistant gene against M. chitwoodi were examined for their degree of relative susceptibility compared to the susceptible cv. Désirée. The potato genotypes were grown in 10-liter pots in artificial soil at a range of initial nematode densities (Pi) from 0 (control), 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64 to 128 juveniles (gram of dry soil)-1. The pot experiment was carried out in a climate controlled glasshouse. The final population density (Pf) and various plant characteristics such as plant height, fresh and under water weight of tubers, fresh root weight, shoot and root dry weight were measured and related to initial nematode density to model yield. Additionally, the root-knot index (RKI) of the tubers was assessed. Plant height was found to increase with nematode densities in all the genotypes. The rootknot index (RKI) score was below 10 for all resistant tested genotypes, which is below the minimum threshold for industrial processing when potato supply is abundant. By comparison, the susceptible cultivar Désirée scored above the maximum threshold when supply is low. Yield, expressed as relative total fresh weight, under water weight and percentage of starch dry matter of tubers, was found to be independent of the initial nematode densities in one genotype and reduced in the three other genotypes with an increase in Pi. Models of estimates of final population dynamics of M. chitwoodi on the resistant genotypes made so far, were all below the equilibrium line (Pi = Pf); their maximum values at the highest Pi were smaller or equal to 0.1 juveniles (gram of dry soil)-1. The tested genotypes proved to be highly resistant. This research is part of a greater research project testing both methodology and population dynamical models in order to downscale and develop a cheap, reliable and consistent method for routine resistance testing. From the results so far, the relative maximum Pf value, maximum population density (“M”) at high initial Pi seems to be a good parameter to indicate degree of resistance. Key words: Screening resistance, population dynamics, and maximum population density.

AB - Four potato genotypes with a single resistant gene against M. chitwoodi were examined for their degree of relative susceptibility compared to the susceptible cv. Désirée. The potato genotypes were grown in 10-liter pots in artificial soil at a range of initial nematode densities (Pi) from 0 (control), 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64 to 128 juveniles (gram of dry soil)-1. The pot experiment was carried out in a climate controlled glasshouse. The final population density (Pf) and various plant characteristics such as plant height, fresh and under water weight of tubers, fresh root weight, shoot and root dry weight were measured and related to initial nematode density to model yield. Additionally, the root-knot index (RKI) of the tubers was assessed. Plant height was found to increase with nematode densities in all the genotypes. The rootknot index (RKI) score was below 10 for all resistant tested genotypes, which is below the minimum threshold for industrial processing when potato supply is abundant. By comparison, the susceptible cultivar Désirée scored above the maximum threshold when supply is low. Yield, expressed as relative total fresh weight, under water weight and percentage of starch dry matter of tubers, was found to be independent of the initial nematode densities in one genotype and reduced in the three other genotypes with an increase in Pi. Models of estimates of final population dynamics of M. chitwoodi on the resistant genotypes made so far, were all below the equilibrium line (Pi = Pf); their maximum values at the highest Pi were smaller or equal to 0.1 juveniles (gram of dry soil)-1. The tested genotypes proved to be highly resistant. This research is part of a greater research project testing both methodology and population dynamical models in order to downscale and develop a cheap, reliable and consistent method for routine resistance testing. From the results so far, the relative maximum Pf value, maximum population density (“M”) at high initial Pi seems to be a good parameter to indicate degree of resistance. Key words: Screening resistance, population dynamics, and maximum population density.

M3 - Abstract

SP - 124

EP - 124

BT - 64th International Symposium on Crop Protection, Gent, 22-05-2012

CY - Ghent, Belgium

ER -

Teklu MG, Been TH, Schomaker CH. Relative susceptibilities of potato genotypes with a single resistant gene for Meloidogyne Chitwoodi. In 64th International Symposium on Crop Protection, Gent, 22-05-2012. Ghent, Belgium. 2012. p. 124-124