Ecklonia

REPORT
Mike Manefield
JAMS this week was a real blast with an excellent presentation by Prof Rainer Meckenstock, director of the Helmholtz Institute for Groundwater Ecology. Rainer's presentation took the fed and watered JAMS audience through a tour de force of anaerobic polyaromatic hydrocarbon degradation from hard core biochemistry to field studies revealing what limits the clean up of hydrocrabons in polluted groundwater resources (the biggest freshwater resource on Earth). Tim Lachnit gave a revealing presentation on disease in seaweed (Ecklonia) driven not by bacteria but by viral infection. Ali Khameneh gave another great short talk on evolutionary responses of Burkholderia cepacia to environmental and host conditions. Ian Paulsen advertised the Synthetic Biology and Bio-engineering Workshop (see attached) - registration closes 1st Oct 2013. The audience was on fire with probing questioning of speakers giving all plenty to think about and pushing the quality of science in our community to further heights.

Event Date: 
Wednesday, September 25, 2013 - 06:00 - 06:15
Institution: 
UNSW
Title: 

Viral infections of Ecklonia radiata

Abstract: 

 
Ecklonia radiata the dominant habitat-forming seaweed in temperate Australia has experienced high rates of mortality in the last decades. Disappearance of this kelp forest would have serious consequences for the marine ecosystem. The causes of mortality are not yet understood but we hypothesise a combination of environmental stress and viral infection. We could demonstrate that disease symptoms such as discolouration and bleaching are widespread but patchy distributed around Australia, which does not correlate simply with latitudinal variation in water temperatures. Focussing on the Kelp populations along the highly urbanised coast of Sydney we observed a highly site-specific pattern in the frequency of disease symptoms in E. radiata populations. Photosynthetic activity of discoloured thalli was significantly reduced compared to co-occurring, healthy (dark brown) thalli. Moreover, we were able to demonstrate that discoloured tissue from Ecklonia radiata from multiple sites around Sydney were infected with a viral pathogen. Inoculation experiments in the laboratory with the extracted viruses of sick tissue resulted in infection of healthy tissue of Ecklonia radiata. The frequency of putative disease morphotypes, and the relative abundance of viruses in Ecklonia radiata around Sydney appear to be higher at sites that are impacted by untreated wastewater discharge.  

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