The Impacts of Drought Stress and Phytophthora cinnamomi Infection on Short-Term Water Relations in Two Year-Old Eucalyptus obliqua
Open Access
- 20 January 2021
- Vol. 12 (2), 109
- https://doi.org/10.3390/f12020109
Abstract
The effects of drought stress, Phytophthora cinnamomi infection and their interaction on water relations and growth were examined for 28 days on two year-old potted trees of Eucalyptus obliqua (L’Hér.). There were significant effects of drought stress on plant photosynthesis, stomatal conductance, biomass accumulation, plant water potential at turgor loss point and the bulk modulus of elasticity. E. obliqua was successfully infected but the trees showed only mild symptoms. Infection with P. cinnamomi led to a significant reduction in the root biomass and root-to-shoot ratio in well-watered and droughted plants but did not impact water relations. There was no observable cumulative effect of drought and P. cinnamomi infection. There are multiple potential reasons why P. cinnamomi infection did not lead to drought-like symptoms in E. obliqua, including short experimental duration, delayed infection symptoms, potential resistance of E. obliqua and a possible lower aggressiveness of the P. cinnamomi strain. Hence, our results indicate that P. cinnamomi infection will not always lead to immediate short-term symptoms, and that plants that are mildly symptomatic respond very similar to drought stress compared to non-infected trees.Keywords
This publication has 69 references indexed in Scilit:
- On underestimation of global vulnerability to tree mortality and forest die‐off from hotter drought in the AnthropoceneEcosphere, 2015
- Phytophthora Species Emerging as Pathogens of Forest TreesCurrent Forestry Reports, 2015
- To die or not to die: early warnings of tree dieback in response to a severe droughtJournal of Ecology, 2015
- Drought, disease, defoliation and death: forest pathogens as agents of past vegetation changeJournal of Quaternary Science, 2013
- Sudden forest canopy collapse corresponding with extreme drought and heat in a mediterranean-type eucalypt forest in southwestern AustraliaEuropean Journal of Forest Research, 2013
- Consequences of widespread tree mortality triggered by drought and temperature stressNature Climate Change, 2012
- Temperature sensitivity of drought-induced tree mortality portends increased regional die-off under global-change-type droughtProceedings of the National Academy of Sciences of the United States of America, 2009
- Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?New Phytologist, 2008
- Interactive effects of drought and pathogens in forest treesAnnals of Forest Science, 2006
- Climate Change Effects on Plant Disease: Genomes to EcosystemsAnnual Review of Phytopathology, 2006