| RRC ID |
21720
|
| Author |
Harke MJ, Berry DL, Ammerman JW, Gobler CJ.
|
| Title |
Molecular response of the bloom-forming cyanobacterium, Microcystis aeruginosa, to phosphorus limitation.
|
| Journal |
Microb Ecol
|
| Abstract |
Cyanobacteria blooms caused by species such as Microcystis have become commonplace in many freshwater ecosystems. Although phosphorus (P) typically limits the growth of freshwater phytoplankton populations, little is known regarding the molecular response of Microcystis to variation in P concentrations and sources. For this study, we examined genes involved in P acquisition in Microcystis including two high-affinity phosphate-binding proteins (pstS and sphX) and a putative alkaline phosphatase (phoX). Sequence analyses among ten clones of Microcystis aeruginosa and one clone of Microcystis wesenbergii indicates that these genes are present and conserved within the species, but perhaps not the genus, as phoX was not identified in M. wesenbergii. Experiments with clones of M. aeruginosa indicated that expression of these three genes was strongly upregulated (50- to 400-fold) under low inorganic P conditions and that the expression of phoX was correlated with alkaline phosphatase activity (p < 0.005). In contrast, cultures grown exclusively on high levels of organic phosphorus sources (adenosine 5'-monophosphate, β-glycerol phosphate, and D: -glucose-6-phosphate) or under nitrogen-limited conditions displayed neither high levels of gene expression nor alkaline phosphatase activity. Since Microcystis dominates phytoplankton assemblages in summer when levels of inorganic P (P(i)) are often low and/or dominate lakes with low P(i) and high organic P, our findings suggest this cyanobacterium may rely on pstS, sphX, and phoX to efficiently transport P(i) and exploit organic sources of P to form blooms.
|
| Volume |
63(1)
|
| Pages |
188-98
|
| Published |
2012-1-1
|
| DOI |
10.1007/s00248-011-9894-8
|
| PMID |
21720829
|
| MeSH |
Alkaline Phosphatase / biosynthesis
Alkaline Phosphatase / metabolism
Bacterial Proteins / genetics
Base Sequence
Biological Transport, Active / genetics
Genes, Bacterial
Microcystis / genetics*
Microcystis / growth & development
Microcystis / metabolism*
Phosphate-Binding Proteins / genetics*
Phosphorus / metabolism*
Phytoplankton / growth & development
Sequence Alignment
Sequence Analysis, DNA
|
| IF |
3.356
|
| Times Cited |
63
|
|
WOS Category
|
MARINE & FRESHWATER BIOLOGY
MICROBIOLOGY
ECOLOGY
|
| Resource |
| Algae |
NIES-843 |
