Prevalent reliance of bacterioplankton on exogenous vitamin B1 and precursor availability

• DOI: 10.1073/pnas.1806425115
• Publication Date: 2018-10-15T19:14:30Z
• Authors: Ryan W. Paerl; John Sundh; Demeng Tan; Sine L. Svenningsen; Samuel Hylander; Jarone Pinhassi; Anders F. Andersson; Lasse Riemann
• Keywords: Bacterioplankton

Significance Virtually all organisms require vitamin B1, including bacterioplankton that impact nutrient cycling and productivity in aquatic systems Earth’s climate. Here, we show B1 auxotrophy, the need for exogenous or precursors survival, is widespread among wild bacterioplankton. Genetic analyses of revealed most are auxotrophs abundance several B1-related genotypes changes temporally at an estuarine monitoring station, suggesting B1/precursor availability influences succession. Complementarily, in-field nutrient-amendment experiments bioassays indicate bioavailability periodically limits bulk growth Together presented data highlight prevalent reliance upon B1/precursors suggest a hitherto overlooked influence on biochemical cycling.