Biologia Plantarum

, Volume 56, Issue 3, pp 422–430 | Cite as

Involvement of G6PDH in heat stress tolerance in the calli from Przewalskia tangutica and Nicotiana tabacum



Glucose-6-phosphate dehydrogenase (G6PDH) has been implicated in supplying reduced nicotine amide cofactors for biochemical reactions and in modulating the redox state of cells. In this study, the role of G6PDH in thermotolerance of the calli from Przewalskia tangutica and tobacco (Nicotiana tabacum L.) was investigated. Results showed that Przewalskia tangutica callus was more sensitive to heat stress than tobacco callus. The activity of G6PDH and antioxidant enzymes (ascorbate peroxidase, catalase, peroxidase and superoxide dismutase) in calli from Przewalskia tangutica and tobacco increased after 40 °C treatment, although two calli exhibited a difference in the degree and timing of response to heat stress. When G6PDH was partially inhibited by glucosamine pretreatment, the antioxidant enzyme activities and thermotolerance in both calli significantly decreased. Simultaneously, the heat-induced H2O2 content and the plasma membrane NADPH oxidase activity were also reduced. Application of H2O2 increased the activity of G6PDH and antioxidant enzymes in both calli. Diphenylene iodonium, a NADPH oxidase inhibitor, counteracted heatinduced H2O2 accumulation and reduced the heat-induced activity of G6PDH and antioxidant enzymes. Moreover, exogenous H2O2 was effective in restoring the activity of G6PDH and antioxidant enzymes after glucosamine pretreatment. Western blot analysis showed that G6PDH gene expression in both calli was also stimulated by heat and H2O2, and blocked by DPI and glucosamine under heat stress. Taken together, under heat stress G6PDH promoted H2O2 accumulation via NADPH oxidase and the elevated H2O2 was involved in regulating the activity of antioxidant enzymes, which in turn facilitate to maintain the steady-state H2O2 level and protect plants from the oxidative damage.

Additional key words

antioxidant enzymes hydrogen peroxide tobacco 



ascorbate peroxidase




diphenylene iodonium


electrolyte leakage


glucose-6-phosphate dehydrogenase


glutathione reductase


reduced glutathione


hydrogen peroxide


oxidative pentose phosphate pathway


plasma membrane




reactive oxygen species


superoxide dismutase


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • H. Gong
    • 1
    • 2
  • G. Chen
    • 1
    • 3
  • F. Li
    • 1
  • X. Wang
    • 1
  • Y. Hu
    • 1
  • Y. Bi
    • 1
    • 3
  1. 1.School of Life SciencesLanzhou UniversityLanzhouP.R. China
  2. 2.School of Life Science and TechnologyLanzhou University of TechnologyLanzhouP.R. China
  3. 3.Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningP.R. China

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