Characterization of an Epiphytic Bacterium &amp;lt;i&amp;gt;Neptunomonas&amp;lt;/i&amp;gt; sp. BPy-1 on the Gametophytes of a Red Alga &amp;lt;i&amp;gt;Pyropia yezoensis&amp;lt;/i&amp;gt;

Handayani, Midia Lestari; Sasaki, Hiroyuki; Matsuda, Ryuya; Takechi, Katsuaki; Takano, Hiroyoshi; Takio, Susumu

doi:10.4236/ajps.2014.524381

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…In turn, the most connected node corresponded to the genus Neptunomonas, which includes members from marine sediments, as well as epiphytic bacteria from red algae Pyropia yezoensis (Rhodophyta) and polycyclic aromatic hydrocarbons degrader (Handayani et al 2014). Information regarding their ecological role in Antarctic seawaters is not seemingly available.…”

Section: Discussionmentioning

confidence: 99%

Summer phyto- and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic Peninsula

et al. 2018

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Phytoplankton blooms taking place during the warm season drive high productivity in Antarctic coastal seawaters. Important temporal and spatial variations exist in productivity patterns, indicating local constraints influencing the phototrophic community. Surface water in Chile Bay (Greenwich Island, South Shetlands) is influenced by freshwater from the melting of sea ice and surrounding glaciers, however it is not a widely studied system. The phyto-and bacterioplankton communities in Chile Bay were studied over two consecutive summers; during a low productivity period (Chlorophyll a < 0.05 mg m -3) and an ascendant phototrophic bloom (Chlorophyll a up to 2.38 mg m -3 ). Microbial communities were analyzed by 16S rRNAincluding plastidialgene sequencing. Diatoms (mainly Thalassiosirales) were the most abundant phytoplankton, particularly during the ascendant bloom. Bacterioplankton in the low productivity period was less diverse and dominated by a few operational taxonomic units (OTUs), related to Colwellia and Pseudoalteromonas. Alpha diversity was higher during the bloom, where several Bacteroidetes taxa absent in the low productivity period were present. Network analysis indicated that phytoplankton relative abundance was correlated with bacterioplankton phylogenetic diversity and the abundance of several bacterial taxa. Hubsthe most connected OTUs in the networkwere not the most abundant OTUs and included some poorly described taxa in Antarctica, such as Neptunomonas and Ekhidna. In summary, the results of this study indicate that in Antarctic Peninsula coastal waters, such as Chile Bay, higher bacterioplankton community diversity occurs during a phototrophic bloom. This is likely a result of primary production, providing a source of fresh organic matter to bacterioplankton.

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Section: Discussionmentioning

confidence: 99%

Summer phyto- and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic Peninsula

et al. 2018

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Production of indoleacetic acid by strains of the epiphytic bacteria Neptunomonas spp. isolated from the red alga Pyropia yezoensis and the seagrass Zostera marina

et al. 2017

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Neptunomonas sp. BPy-1 is an epiphytic bacterium isolated from in vitro culture of the red alga Pyropia yezoensis. It uses ethanol as a sole carbon source and promotes the growth of host alga. A related bacterium, Neptunomonas sp. BZm-1, was isolated from leaves of Zostera marina found in the Yatsushiro Sea (Japan). BZm-1 showed 99% 16S rRNA sequence identity with Neptunomonas sp. BPy-1. Similar to BPy-1, BZm-1 grew in artificial seawater (ASW) medium containing ethanol or butanol. When thalli were treated with a multi-enzyme cleaner, the growth of treated thalli was retarded, but the addition of BZm-1 to the medium promoted growth. To explore the benefits of epiphytic bacteria, indoleacetic acid (IAA) production by isolated bacteria was examined under conditions of limited nutrients. Salkowski assays and GC-MS analysis revealed that both BZm-1 and BPy-1 excreted IAA during growth in ASW medium containing glucose or ethanol in the presence of tryptophan. In ASW medium containing tryptophan but lacking a carbon source, neither isolate grow, but produced IAA. ASW medium includes nitrate as the sole nitrogen source. In the absence of carbon source, different nitrogen forms in the presence of tryptophan did not affect IAA production by the two isolates. These findings indicate that IAA production by the two isolates is strictly dependent on tryptophan but less affected by carbon and nitrogen sources. Based on the different origins of BPy-1 and BZm-1, this mode of IAA production seems to be conserved among relatives of BPy-1.

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Effects of Hyphomonas Strains on the Growth of Red Algae Pyropia Species by Attaching Specifically to Their Rhizoids

Fukui

Kobayashi

2023

Microb Ecol

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Characterization of an Epiphytic Bacterium <i>Neptunomonas</i> sp. BPy-1 on the Gametophytes of a Red Alga <i>Pyropia yezoensis</i>

Cited by 4 publications

References 20 publications

Summer phyto- and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic Peninsula

Summer phyto- and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic Peninsula

Production of indoleacetic acid by strains of the epiphytic bacteria Neptunomonas spp. isolated from the red alga Pyropia yezoensis and the seagrass Zostera marina

Effects of Hyphomonas Strains on the Growth of Red Algae Pyropia Species by Attaching Specifically to Their Rhizoids

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