The Plant Pathology Journal (Oct 2017)

Temperature and CO₂ Level Influence Potato leafroll virus Infection in Solanum tuberosum

  • Bong Nam Chung,
  • Sang Wook Koh,
  • Kyung San Choi,
  • Jae Ho Joa,
  • Chun Hwan Kim,
  • Gopal Selvakumar

DOI
https://doi.org/10.5423/PPJ.NT.01.2017.0019
Journal volume & issue
Vol. 33, no. 5
pp. 522 – 527

Abstract

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We determined the effects of atmospheric temperature (10–30 ± 2°C in 5°C increments) and carbon dioxide (CO₂) levels (400 ± 50 ppm, 540 ± 50 ppm, and 940 ± 50 ppm) on the infection of Solanum tuberosum cv. Chubaek by Potato leafroll virus (PLRV). Below CO₂ levels of 400 ± 50 ppm, the PLRV infection rate and RNA content in plant tissues increased as the temperature increased to 20 ± 2°C, but declined at higher temperatures. At high CO₂ levels (940 ± 50 ppm), more plants were infected by PLRV at 30 ± 2°C than at 20 or 25 ± 2°C, whereas PLRV RNA content was unchanged in the 20–30 ± 2°C temperature range. The effects of atmospheric CO₂ concentration on the acquisition of PLRV by Myzus persicae and accumulation of PLRV RNA in plant tissues were investigated using a growth chamber at 20 ± 2°C. The M. persicae PLRV RNA content slightly increased at elevated CO₂ levels (940 ± 50 ppm), but this increase was not statistically significant. Transmission rates of PLRV by Physalis floridana increased as CO₂ concentration increased. More PLRV RNA accumulated in potato plants maintained at 540 or 940 ± 50 ppm CO₂, than in plants maintained at 400 ± 50 ppm. This is the first evidence of greater PLRV RNA accumulation and larger numbers of S. tuberosum plants infected by PLRV under conditions of combined high CO₂ levels (940 ± 50 ppm) and high temperature (30 ± 2°C).

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