The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population.
The bacterial taxon Polynucleobacter necessarius subspecies asymbioticus represents a group of planktonic freshwater bacteria with cosmopolitan and ubiquitous distribution in standing freshwater habitats. These bacteria comprise <1% to 70% (on average about 20%) of total bacterioplankton cells in...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Public Library of Science (PLoS)
2012-01-01
|
Series: | PLoS ONE |
Online Access: | http://europepmc.org/articles/PMC3308952?pdf=render |
id |
doaj-2177d1e32d2a4a019a7124eb16a7be11 |
---|---|
record_format |
Article |
spelling |
doaj-2177d1e32d2a4a019a7124eb16a7be112020-11-25T01:33:44ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0173e3277210.1371/journal.pone.0032772The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population.Martin W HahnThomas ScheuerlJitka JezberováUlrike KollJan JezberaKarel ŠimekClaudia VanniniGiulio PetroniQinglong L WuThe bacterial taxon Polynucleobacter necessarius subspecies asymbioticus represents a group of planktonic freshwater bacteria with cosmopolitan and ubiquitous distribution in standing freshwater habitats. These bacteria comprise <1% to 70% (on average about 20%) of total bacterioplankton cells in various freshwater habitats. The ubiquity of this taxon was recently explained by intra-taxon ecological diversification, i.e. specialization of lineages to specific environmental conditions; however, details on specific adaptations are not known. Here we investigated by means of genomic and experimental analyses the ecological adaptation of a persistent population dwelling in a small acidic pond.The investigated population (F10 lineage) contributed on average 11% to total bacterioplankton in the pond during the vegetation periods (ice-free period, usually May to November). Only a low degree of genetic diversification of the population could be revealed. These bacteria are characterized by a small genome size (2.1 Mb), a relatively small number of genes involved in transduction of environmental signals, and the lack of motility and quorum sensing. Experiments indicated that these bacteria live as chemoorganotrophs by mainly utilizing low-molecular-weight substrates derived from photooxidation of humic substances.Evolutionary genome streamlining resulted in a highly passive lifestyle so far only known among free-living bacteria from pelagic marine taxa dwelling in environmentally stable nutrient-poor off-shore systems. Surprisingly, such a lifestyle is also successful in a highly dynamic and nutrient-richer environment such as the water column of the investigated pond, which was undergoing complete mixis and pronounced stratification in diurnal cycles. Obviously, metabolic and ecological versatility is not a prerequisite for long-lasting establishment of abundant bacterial populations under highly dynamic environmental conditions. Caution should be exercised when generalizing the obtained insights into the ecology and adaptation of the investigated lineage to other Polynucleobacter lineages.http://europepmc.org/articles/PMC3308952?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martin W Hahn Thomas Scheuerl Jitka Jezberová Ulrike Koll Jan Jezbera Karel Šimek Claudia Vannini Giulio Petroni Qinglong L Wu |
spellingShingle |
Martin W Hahn Thomas Scheuerl Jitka Jezberová Ulrike Koll Jan Jezbera Karel Šimek Claudia Vannini Giulio Petroni Qinglong L Wu The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. PLoS ONE |
author_facet |
Martin W Hahn Thomas Scheuerl Jitka Jezberová Ulrike Koll Jan Jezbera Karel Šimek Claudia Vannini Giulio Petroni Qinglong L Wu |
author_sort |
Martin W Hahn |
title |
The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
title_short |
The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
title_full |
The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
title_fullStr |
The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
title_full_unstemmed |
The passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
title_sort |
passive yet successful way of planktonic life: genomic and experimental analysis of the ecology of a free-living polynucleobacter population. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2012-01-01 |
description |
The bacterial taxon Polynucleobacter necessarius subspecies asymbioticus represents a group of planktonic freshwater bacteria with cosmopolitan and ubiquitous distribution in standing freshwater habitats. These bacteria comprise <1% to 70% (on average about 20%) of total bacterioplankton cells in various freshwater habitats. The ubiquity of this taxon was recently explained by intra-taxon ecological diversification, i.e. specialization of lineages to specific environmental conditions; however, details on specific adaptations are not known. Here we investigated by means of genomic and experimental analyses the ecological adaptation of a persistent population dwelling in a small acidic pond.The investigated population (F10 lineage) contributed on average 11% to total bacterioplankton in the pond during the vegetation periods (ice-free period, usually May to November). Only a low degree of genetic diversification of the population could be revealed. These bacteria are characterized by a small genome size (2.1 Mb), a relatively small number of genes involved in transduction of environmental signals, and the lack of motility and quorum sensing. Experiments indicated that these bacteria live as chemoorganotrophs by mainly utilizing low-molecular-weight substrates derived from photooxidation of humic substances.Evolutionary genome streamlining resulted in a highly passive lifestyle so far only known among free-living bacteria from pelagic marine taxa dwelling in environmentally stable nutrient-poor off-shore systems. Surprisingly, such a lifestyle is also successful in a highly dynamic and nutrient-richer environment such as the water column of the investigated pond, which was undergoing complete mixis and pronounced stratification in diurnal cycles. Obviously, metabolic and ecological versatility is not a prerequisite for long-lasting establishment of abundant bacterial populations under highly dynamic environmental conditions. Caution should be exercised when generalizing the obtained insights into the ecology and adaptation of the investigated lineage to other Polynucleobacter lineages. |
url |
http://europepmc.org/articles/PMC3308952?pdf=render |
work_keys_str_mv |
AT martinwhahn thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT thomasscheuerl thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT jitkajezberova thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT ulrikekoll thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT janjezbera thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT karelsimek thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT claudiavannini thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT giuliopetroni thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT qinglonglwu thepassiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT martinwhahn passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT thomasscheuerl passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT jitkajezberova passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT ulrikekoll passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT janjezbera passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT karelsimek passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT claudiavannini passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT giuliopetroni passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation AT qinglonglwu passiveyetsuccessfulwayofplanktoniclifegenomicandexperimentalanalysisoftheecologyofafreelivingpolynucleobacterpopulation |
_version_ |
1725076003248668672 |