Occurrence of chlorophyll allomers during virus-induced mortality and population decline in the ubiquitous picoeukaryote Ostreococcus tauri.

Steele, D.J., Kimmance, S.A., Franklin, D. J. and Airs, R.L., 2017. Occurrence of chlorophyll allomers during virus-induced mortality and population decline in the ubiquitous picoeukaryote Ostreococcus tauri. Environmental microbiology. (In Press)

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DOI: 10.1111/1462-2920.13980

Abstract

During viral infection and growth limitation of the picoeukaryote Ostreococcus tauri, we examined the relationship between membrane permeability, oxidative stress and chlorophyll allomers (oxidation products). Chlorophyll allomers were measured in batch-cultures of O. tauri in parallel with maximum quantum efficiency of photosystem II photochemistry (Fv/Fm), carotenoids, and reactive oxygen species and membrane permeability using fluorescent probes (CM-H2DCFDA and SYTOX-Green). Viral infection led to mass cell lysis of the O. tauri cells within 48 h. The concentration of the allomer hydroxychlorophyll a peaked with a 16-fold increase (relative to chlorophyll-a) just after the major lysis event. In contrast, cell death due to growth limitation resulted in a 2-fold increase in allomer production, relative to chl-a. Two allomers were detected solely in association with O. tauri debris after viral lysis, and unlike other allomers were not observed before viral lysis, or during cell death due to growth limitation. Conversely, the component chl-aP276 was found in the highest concentrations relative to chl-a, in exponentially growing O. tauri. The components described have potential as indicators of mode of phytoplankton mortality, and of population growth.

Item Type:Article
ISSN:1462-2912
Additional Information:U.K. Natural Environment Research Council (NE/I528034/1).
Group:Faculty of Science & Technology
ID Code:29963
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 Nov 2017 11:19
Last Modified:13 Nov 2017 11:19

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