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Influence of Temperature on Susceptibility of CVS. Tifguard and Georgia-06G Peanut to Meloidogyne arenaria Cover

Influence of Temperature on Susceptibility of CVS. Tifguard and Georgia-06G Peanut to Meloidogyne arenaria

Journal of Nematology
Volume 50 (2018): Issue 1 (January 2018)
By: Weimin Yuan,  C. C. Holbrook,  Y. Chu,  P. Ozias-Akins and  D. W. Dickson  
Open Access
|May 2018

Figures & Tables

Figure 1

Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 30-day period in Experiment 1.
Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 30-day period in Experiment 1.

Figure 2

Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 40-day period in Experiment 2.
Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 40-day period in Experiment 2.

Figure 3

Number of second-stage juveniles (J2) per gram of root system of the resistant cultivar Tifguard and the susceptible cultivar Georgia-06G 5 days after inoculation in Experiments 1 and 2. Different letters over bars from the same experiment indicate significant differences at P ≤ 0.05.
Number of second-stage juveniles (J2) per gram of root system of the resistant cultivar Tifguard and the susceptible cultivar Georgia-06G 5 days after inoculation in Experiments 1 and 2. Different letters over bars from the same experiment indicate significant differences at P ≤ 0.05.

Figure 4

Number of Meloidogyne arenaria second-stage juveniles (J2) and females 30 days after inoculation (Experiment 1), and J2, females, and egg-laying females 40 days after inoculation (Experiment 2) on Tifguard .
Number of Meloidogyne arenaria second-stage juveniles (J2) and females 30 days after inoculation (Experiment 1), and J2, females, and egg-laying females 40 days after inoculation (Experiment 2) on Tifguard .

Figure 5

Number of egg-laying females per gram of roots of the resistant cultivar Tifguard and susceptible cultivar Georgia-06G at 30 or 40 days after inoculation in Experiments 1 and 2, respectively. Bars followed by different letters from the same experiment indicate significant differences at P ≤ 0.05.
Number of egg-laying females per gram of roots of the resistant cultivar Tifguard and susceptible cultivar Georgia-06G at 30 or 40 days after inoculation in Experiments 1 and 2, respectively. Bars followed by different letters from the same experiment indicate significant differences at P ≤ 0.05.

Figure 6

Mature egg-laying females and necrotic lesions formed around Meloidogyne arenaria infection sites in Tifguard roots. A. Mature females at 35 days after inoculation (DAI) at 34°C; B. Egg-laying female at 40 DAI at 34°C (arrow points to egg mass); C. Arrow points to necrotic lesion at 5 DAI; D. Arrow points to necrotic lesion at 40 DAI.
Mature egg-laying females and necrotic lesions formed around Meloidogyne arenaria infection sites in Tifguard roots. A. Mature females at 35 days after inoculation (DAI) at 34°C; B. Egg-laying female at 40 DAI at 34°C (arrow points to egg mass); C. Arrow points to necrotic lesion at 5 DAI; D. Arrow points to necrotic lesion at 40 DAI.

Figure 7

Number of Meloidogyne arenaria eggs per egg mass from roots of the peanut cultivars Tifguard (resistant) and Georgia-06G (susceptible) at 34°C at 40 days after inoculation. Different letters over bars indicate significant differences at P ≤ 0.05.
Number of Meloidogyne arenaria eggs per egg mass from roots of the peanut cultivars Tifguard (resistant) and Georgia-06G (susceptible) at 34°C at 40 days after inoculation. Different letters over bars indicate significant differences at P ≤ 0.05.

Analysis of variance of root weight, number of Meloidogyne arenaria per gram of roots of peanut cultivars Georgia 06G and Tifguard_

Source of varianceF value
Root weight
Cultivar2.744e-06 ***
Temperature0.6528
DAIa<2.2e-16 ***
Cultivar × Temperature0.7204
Cultivar × DAI1.896e-08 ***
Temperature × DAI0.8505
Cultivar × Temperature × DAI0.7657
M. arenaria per gram of roots Experiment 1
Cultivar0.0009106 ***
Temperature0.0059029 **
DAI<2.2e-16 ***
Cultivar × Temperature0.0374213 *
Cultivar × DAI0.0005185 ***
Temperature × DAI4e-07 ***
Cultivar × Temperature × DAI0.0197020 *
M. arenaria per gram of roots Experiment 2
Cultivar6.651e-07 ***
Temperature0.0001727 ***
DAI<2.2e-16 ***
Cultivar × Temperature0.0109771 *
Cultivar × DAI3.001e-09 ***
Temperature × DAI<2.2e-16 ***
Cultivar × Temperature × DAI6.126e-06 ***
DOI: https://doi.org/10.21307/jofnem-2018-006 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
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Language: English
Page range: 33 - 40
Accepted on: Jul 27, 2017
Published on: May 31, 2018
Published by: Society of Nematologists, Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
resistance,
root-knot nematode,
temperature
Related subjects:
Life sciences,
Life sciences, other

© 2018 Weimin Yuan, C. C. Holbrook, Y. Chu, P. Ozias-Akins, D. W. Dickson, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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