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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

Jill R. Pollok

Jill R. Pollok

  • Virginia Tech, Southern Piedmont Agricultural Research and Extension CenterBlackstone,
  • Virginia Tech, School of Plant and Environmental SciencesBlacksburg,
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Pollok, Jill R.
, 
Charles S. Johnson

Charles S. Johnson

  • Virginia Tech, Southern Piedmont Agricultural Research and Extension CenterBlackstone,
  • Virginia Tech, School of Plant and Environmental SciencesBlacksburg,
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Johnson, Charles S.
, 
J.D. Eisenback

J.D. Eisenback

Virginia Tech, School of Plant and Environmental SciencesBlacksburg,
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Eisenback, J.D.
, 
T. David Reed

T. David Reed

Virginia Tech, Southern Piedmont Agricultural Research and Extension CenterBlackstone,
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David Reed, T.
 and 
Noah Adamo

Noah Adamo

  • Virginia Tech, Southern Piedmont Agricultural Research and Extension CenterBlackstone,
  • Virginia Tech, School of Plant and Environmental SciencesBlacksburg,
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Adamo, Noah
  
Aug 01, 2023
Effect of Soil Temperature on Reproduction of Root-knot Nematodes in Flue-cured Tobacco with Homozygous Rk1 and/or Rk2 Resistance Genes's Cover Image
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Article Category: Research Paper
Published Online: Aug 01, 2023
Received: Apr 08, 2022
DOI: https://doi.org/10.2478/jofnem-2023-0032
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© 2023 Jill R. Pollok et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

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 entry Resistance genes Soil temperature (°C) Reproductive index (Pf/Pi)ab by trial
June–July 2014 (summer) Sept–Oct 2014 (fall) Dec 2014–Jan 2015 (winter)
C371G None 25 11.3 A 18.5 a 9.4 a’
T-15-1-1 Rk2 25 3.0 B 1.9 b 3.6 b’
SC 72 Rk1 25 0.7 C 0.3 b 0.2 c’
NC 95 Rk1 25 0.6 C 0.2 b 0.1 c’
NOD 8 Rk1Rk2 25 0.2 C 0.4 b 0.2 c’
STNCB-2-28 Rk1Rk2 25 0.2 C 0.5 b 0.1 c’
C371G None 30 14.8 A 29.3 a 38.9 a’
T-15-1-1 Rk2 30 11.8 A 35.4 a 25.3 a’
SC 72 Rk1 30 1.9 B 0.7 b 3.8 bc’
NC 95 Rk1 30 1.3 B 1.2 b 8.7 b’
NOD 8 Rk1Rk2 30 0.1 B 0.9 b 3.3 bc’
STNCB-2-28 Rk1Rk2 30 1.7 B 1.2 b 1.8 c’
C371G None 35 3.5 A 50.0 a 10.5 a’
T-15-1-1 Rk2 35 3.5 A 37.0 a 10.8 a’
SC 72 Rk1 35 2.3 A 1.1 b 3.4 a’
NC 95 Rk1 35 1.9 A 1.7 b 5.8 a’
NOD 8 Rk1Rk2 35 3.7 A 1.2 b 3.2 a’
STNCB-2-28 Rk1Rk2 35 2.9 A 2.5 b 2.5 a’
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