Multiple opportunistic pathogens can cause a bleaching disease in the red seaweed Delisea pulchra.

摘要: While macroalgae (or seaweeds) are increasingly recognized to suffer from disease, in most cases the causative agents unknown. The model macroalga Delisea pulchra is susceptible a bleaching disease and previous work has identified two epiphytic bacteria, belonging Roseobacter clade, that cause under laboratory conditions. However, recent environmental surveys have shown these vitro pathogens not abundant naturally bleached D. pulchra, suggesting presence of other capable causing this algal disease. To test hypothesis, we cultured bacteria were on tissue across multiple events assessed their ability We new Alteromonas sp. BL110, Aquimarina AD1 BL5 Agarivorans sp BL7 phylogenetically diverse, distinct can also be found low abundance healthy individuals. Moreover, bacterial communities diseased individuals infected with less diverse more divergent each than those algae. This study demonstrates opportunistic same outcome for postulate such common marine systems previously anticipated.