European Journal of Plant Pathology

, Volume 140, Issue 1, pp 19–37 | Cite as

The influence of increasing temperature and CO2 on Fusarium crown rot susceptibility of wheat genotypes at key growth stages

  • P. Melloy
  • E. Aitken
  • J. Luck
  • S. Chakraborty
  • F. Obanor


Despite recent reports advancing our understanding of climate change on plant diseases, uncertainty remains concerning how host and pathogen interactions are changed by increases in atmospheric carbon-dioxide (CO2) and temperature. This study has observed crown rot inoculated and non-inoculated plants in three glasshouse environments comprising ambient CO2 with ambient temperature (E1), elevated CO2 with ambient temperature (E2) and elevated CO2 with warm temperatures (E3). The proportion of crown rot infected tillers (incidence), length of stem browning (severity) and biomass of Fusarium pseudograminearum in 16 wheat genotypes was destructively assessed at node development, anthesis, soft dough and crop maturity. Mean incidence, severity and Fusarium biomass was greater in E2, and all three measurements increased at a faster rate across plant development stages; E1 showed the lowest mean incidence and severity. Incidence and severity at each development stage was dependent on the environment each genotype was grown. The influence of genotype on Fusarium biomass at each development stage however was not seen to be dependent on environment. Irrespective of genotype plants with greater severity or relative Fusarium biomass showed lower plant dry weight at crop maturity in all environments with exception to E3, where CR severity did not exert a cost to plant dry weight. These results may allude to plant maturity and temperature-dependent resistance as effective mechanisms in building resistance to crown rot. Regardless of temperature, if crown rot symptoms and Fusarium biomass are to increase at elevated CO2 there is potential for a loss in crop production capability while boosting inoculum in crop stubble.


Fusarium pseudograminearum Crown rot Carbon-dioxide Plant-pathogen interaction Temperature Fungal biomass 

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2014

Authors and Affiliations

  • P. Melloy
    • 1
    • 2
  • E. Aitken
    • 3
  • J. Luck
    • 4
  • S. Chakraborty
    • 1
  • F. Obanor
    • 1
  1. 1.CSIRO Plant IndustrySt LuciaAustralia
  2. 2.School of Agriculture and Food SciencesThe University of QueenslandSt LuciaAustralia
  3. 3.School of Agriculture and Food SciencesThe University of QueenslandSt LuciaAustralia
  4. 4.CRC Plant Biosecurity, 11 The University of MelbourneBurnley CampusRichmondAustralia

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