Phytophthora cinnamomi exhibits phenotypic plasticity in response to cold temperatures

Khaliq, Ihsanul and Hardy, Giles E. St. J. and Burgess, Treena I. (2020) Phytophthora cinnamomi exhibits phenotypic plasticity in response to cold temperatures. Mycological Progress, 19. pp. 405-415. ISSN 1617-416X


Abstract

Phytophthora cinnamomi has recently been found in highly diverse and fragile alpine and sub-alpine environments previously considered P. cinnamomi and disease free due to low temperatures. In the laboratory, we investigated the ability of P. cinnamomi isolates to adapt to cold and cause disease under conditions comparable to alpine and sub-alpine environments. Initially, the ability of P. cinnamomi isolates to produce sporangia at 10 °C (2 °C lower than previously reported in the literature) was demonstrated in vitro. The lowest temperature limit for host infection was determined (i.e., 8 °C) and the phenotypic plasticity of isolates was then explored in planta in two successive phenotypic plasticity experiments comparing cold 9, 7.5 °C, and ambient temperature 25 (±5 °C). In the phenotypic plasticity experiment-1, three of the five isolates recovered from plants grown at 9 °C produced sporangia and released zoospores (infective propagules) at 7.5 °C, even lower than determined initially, i.e., 10 °C. No changes were observed in the same set of isolates recovered from plants grown at ambient temperature in the glasshouse as a control, which shows that P. cinnamomi can exhibit phenotypic plasticity and responds rapidly to selection pressure and adapts to new environments. Although P. cinnamomi isolates could produce infective propagules at 7.5 °C in vitro, they could not be recovered from inoculated plants grown at 7.5 °C after 3 months in phenotypic plasticity experiment-2. More work is, therefore, needed to establish disease development by P. cinnamomi at 7.5 °C and below.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 17 Jul 2020 05:36
Last Modified: 20 Jul 2020 03:38
Uncontrolled Keywords: Cold adaptation; Climate change; Alpine and sub-alpine; Selection pressure; Invasion; Range expansion
Fields of Research (2008): 06 Biological Sciences > 0602 Ecology > 060201 Behavioural Ecology
05 Environmental Sciences > 0501 Ecological Applications > 050103 Invasive Species Ecology
05 Environmental Sciences > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change
Fields of Research (2020): 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology
41 ENVIRONMENTAL SCIENCES > 4102 Ecological applications > 410202 Biosecurity science and invasive species ecology
41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410102 Ecological impacts of climate change and ecological adaptation
Identification Number or DOI: https://doi.org/10.1007/s11557-020-01578-4 M
URI: http://eprints.usq.edu.au/id/eprint/38699

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