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Effect of Soil Temperature on Reproduction of Root-knot Nematodes in Flue-cured Tobacco with Homozygous Rk1 and/or Rk2 Resistance Genes Cover

Effect of Soil Temperature on Reproduction of Root-knot Nematodes in Flue-cured Tobacco with Homozygous Rk1 and/or Rk2 Resistance Genes

Open Access
|Aug 2023

Figures & Tables

Figure 1:

Percent root galling of six tobacco (Nicotiana tabacum L.) entries inoculated with a population of Meloidogyne incognita race 3 and grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are the means of four observations from the summer trial and six observations from the fall and winter trials. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.
Percent root galling of six tobacco (Nicotiana tabacum L.) entries inoculated with a population of Meloidogyne incognita race 3 and grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are the means of four observations from the summer trial and six observations from the fall and winter trials. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.

Figure 2:

Numbers of egg masses per gram root of a population of Meloidogyne incognita race 3 on six tobacco (Nicotiana tabacum L.) entries grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are means of four observations from the summer trial and six observations from the fall and winter experiments. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.
Numbers of egg masses per gram root of a population of Meloidogyne incognita race 3 on six tobacco (Nicotiana tabacum L.) entries grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are means of four observations from the summer trial and six observations from the fall and winter experiments. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.

Figure 3:

Total egg production per gram of root of a population of Meloidogyne incognita race 3 on six tobacco (Nicotiana tabacum L.) entries grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are means of four observations from the summer trial and six observations from the fall and winter experiments. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.
Total egg production per gram of root of a population of Meloidogyne incognita race 3 on six tobacco (Nicotiana tabacum L.) entries grown at three soil temperatures in greenhouse trials. (A) summer (June–July 2014), (B) fall (Sept–Oct 2014), and (C) winter (Dec 2014–Jan 2015). Data presented are means of four observations from the summer trial and six observations from the fall and winter experiments. Means for experimental entries associated with the same letter(s), within each season and soil temperature, are not significantly different according to the Tukey-Kramer honest significant difference (HSD) test of transformed [log10(x+1)] data (P = 0.05). Susc. = susceptible.

Reproduction of a population of Meloidogyne incognita race 3 on six tobacco (Nicotiana tabacum L_) entries grown at three soil temperatures in greenhouse trials conducted in 2014–2015_

Plant entryResistance genesSoil temperature (°C)Reproductive index (Pf/Pi)ab by trial

June–July 2014 (summer)Sept–Oct 2014 (fall)Dec 2014–Jan 2015 (winter)
C371GNone2511.3 A18.5 a9.4 a’
T-15-1-1Rk2253.0 B1.9 b3.6 b’
SC 72Rk1250.7 C0.3 b0.2 c’
NC 95Rk1250.6 C0.2 b0.1 c’
NOD 8Rk1Rk2250.2 C0.4 b0.2 c’
STNCB-2-28Rk1Rk2250.2 C0.5 b0.1 c’
C371GNone3014.8 A29.3 a38.9 a’
T-15-1-1Rk23011.8 A35.4 a25.3 a’
SC 72Rk1301.9 B0.7 b3.8 bc’
NC 95Rk1301.3 B1.2 b8.7 b’
NOD 8Rk1Rk2300.1 B0.9 b3.3 bc’
STNCB-2-28Rk1Rk2301.7 B1.2 b1.8 c’
C371GNone353.5 A50.0 a10.5 a’
T-15-1-1Rk2353.5 A37.0 a10.8 a’
SC 72Rk1352.3 A1.1 b3.4 a’
NC 95Rk1351.9 A1.7 b5.8 a’
NOD 8Rk1Rk2353.7 A1.2 b3.2 a’
STNCB-2-28Rk1Rk2352.9 A2.5 b2.5 a’
DOI: https://doi.org/10.2478/jofnem-2023-0032 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Submitted on: Apr 8, 2022
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Published on: Aug 1, 2023
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2023 Jill R. Pollok, Charles S. Johnson, J.D. Eisenback, T. David Reed, Noah Adamo, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.