02896nas a2200205   4500008004500000020001400045245015000059210006900209260001700278490000700295520212800302653011002430100001802540700001902558700001402577700001202591700001902603700001702622856005102639       2019                        Engldsh    a1664-302X00aCompositional Shifts of Bacterial Communities Associated With <i>Pyropia yezoensis</i> and Surrounding Seawater Co-occurring With Red Rot Disease0 aCompositional Shifts of Bacterial Communities Associated With iP  c2019-July-230 v103 a<p>Pyropia yezoensis is commercially the most important edible red alga in China, and red rot disease is viewed as one of the major constraints for its cultivation. Microbes within the oomycetic genus Pythium have been reported as the causative agents for this disease; however, little is known about the interactions between the disease and the epiphytic and planktonic bacterial communities. In the present study, bacterial communities associated with uninfected, locally infected, and seriously infected thalli collected from cultivation farms, and within seawater adjacent to the thalli, were investigated using in-depth 16S ribosomal RNA (rRNA) gene sequencing in conjunction with assessing multiple environmental factors. For both thalli and seawater, uninfected and infected communities were significantly different though alpha diversity was similar. Phylogenetic differences between epiphytic bacterial communities associated with P. yezoensis were mainly reflected by the relative changes in the dominant operational taxonomic units (OTUs) assigned as genus Flavirhabdus, genus Sulfitobacter, and family Rhodobacteraceae. The prevalent OTUs in seawater also differed in relative abundance across the communities and were affiliated with diverse taxa, including the phyla Actinobacteria, Verrucomicrobia, and Bacteroidetes, and the classes Alpha- and Gamma-proteobacteria. The differentiation of bacterial communities associated with P. yezoensis and seawater was primarily shaped by reactive silicate (RS) content and salinity, respectively. In particular, 14 potential indicators (two OTUs on P. yezoensis and twelve OTUs in seawater) were identified that significantly differentiated P. yezoensis health statuses and correlated with environmental changes. Overall, the present study provides insights into the alterations of bacterial communities associated with P. yezoensis and surrounding seawater co-occurring with red rot disease. Observed changes were closely associated with health status of algal host, and highlight the potential of using community differentiation to forecast disease occurrence.</p>
10aRed rot disease,Pyropia yezoensis,Seawater,Bacterial communities,Compositional shifts,Potential indicator1 aYan, Yong-Wei1 aYang, Hui-Chao1 aTang, Lei1 aLi, Jie1 aMao, Yun-Xiang1 aMo, Zhao-Lan  uhttps://algaldiseases.myspecies.info/node/1657