title: Comparative analysis of alkaline phosphatase-encoding genes (phoX) in two contrasting zones of Lake Taihu.
abstract: Limnetic habitats that are dominated by either algae or macrophytes represent the 2 dominant ecosystems in shallow lakes. We assessed seasonal variations in the diversity and abundance of alkaline phosphate-encoding genes (phoX) in these 2 zones of Lake Taihu, which is a large, shallow, eutrophic lake in China. There was no significant difference in seasonal mean phoX diversity between the 2 zones, whereas the seasonal mean phoX abundance in the macrophyte-dominated region was higher than that in the algae-dominated region. The bulk of the genotypes in the 2 regions were most similar to the alphaproteobacterial and betaproteobacterial phoX. Genotypes most similar to phoX affiliated with Betaproteobacteria were present with greater diversity in the macrophyte-dominated zone than in the algae-dominated zone. In the algae-dominated zone, the relative proportion of genotypes most similar to cyanobacterial phoX was highest (38.8%) in summer. In addition to the different genotype structures and environmental factors between the 2 stable states, the lower gene abundances and higher alkaline phosphatase activities in Meiliang Bay in summer than those in Xukou Bay reveals different organophosphate-mineralizing modes in these 2 contrasting habitats.
authors: State Key Laboratory of Hydrology - Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, People's Republic of China.
authors: Jiangyu
authors: J
authors: Dai
authors: Dan
authors: D
authors: Chen
authors: Shiqiang
authors: S
authors: Wu
authors: Xiufeng
authors: X
authors: Wu
authors: Jie
authors: J
authors: Zhou
authors: Xiangming
authors: X
authors: Tang
authors: Keqiang
authors: K
authors: Shao
authors: Guang
authors: G
authors: Gao
mesh_terms: D000469:Alkaline Phosphatase / Q000235:genetics* / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D002681:China; D017753:Ecosystem; D014644:Genetic Variation; D060106:Lakes / Q000382:microbiology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D020560:Proteobacteria / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D012621:Seasons
chemical_list: D001426:Bacterial Proteins; D000469:Alkaline Phosphatase
keywords: algae-dominated; bacterial phoX; dominé par les algues; dominé par les macrophytes; lac peu profond; macrophyte-dominated; phoX bactérien; shallow lake