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Feeding selection of mix-trophic flagellate Poterioochromonas malhamensis on the green algae of Chlorella

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Protistology
presence of molecular signals of eukaryotic groups
including Dinophyta, Stramenopiles, Ciliophora
and Fungi. The relative proportions of these major
groups were different among the three sites, with
NYS and SYS were more similar to each other than
to YR. Here we will briefly report the community
composition and structure of microbial eukaryotes,
and hope to link these signals in the near future with
geochemical information to reflect the ecosystem
conditions and changes of the north China Seas
during the past thousands of years.
FEEDING SELECTION OF MIX-TROPHIC
FLAGELLATE, POTERIOOCHROMONAS
MALHAMENSIS, ON THE GREEN ALGAE OF
CHLORELLA
Gong Yingchun1,2, Ma Mingyang1,2, Wei Chaojun1,2
1
- Center for Microalgal Biotechnology and Biofuels,
Institute of Hydrobiology, Chinese Academy of
Sciences, Wuhan, China
2
- Key Laboratory for Algal Biology, Institute of
Hydrobiology, Chinese Academy of Sciences, Wuhan,
China
springgong@ihb.ac.cn
Poterioochromonas is a very common mix-trophic
flagellate in most freshwater environments, which
can grow in autotrophic way or by feeding bacteria
and other protists. Several species of algae have
been reported to be the prey of Poterioochromonas,
however little is known about whether and how
Poterioochromonas has feeding selection on the prey.
In this study, two strains of Chlorella sorokiniana
showed significantly different defense ability on the
grazing of Poterioochromonas. Both morphological
and molecular approaches were combined to
discover the factors which contributed to the defense
ability on grazing. Light microscopic showed that
the two strains didn’t have much difference on the
cell size and shape, however transmission electron
microscopic observations and protein composition
analysis indicated that the two strains have different
cell wall composition and biochemical composition.
Our research suggested that probably some protein
in the cell wall of Chlorella played an important way
to defense the grazing of Poterioochromonas.
THE GENOME OF UNDARIA PINNATIFIDA
AND UNDARIA PETERSENIANA: INSIGHTS
INTO KELP EVOLUTION
Graf L.1, Yang J.H.1, Lee J.M.1, Boo S.M.2, Yoon
H.S.1
1
- Department of Biological Sciences, Sungkyunkwan
University, Suwon 16419, Korea
2
- Department of Biology, Chungnam National Uni-
· 23
versity, Daejeon 34134, Korea
louis.graf@gmail.com
The genus Undaria consists of large multicellular
brown algal kelps. In Korea, U. pinnatifida and U.
peterseniana are extensively cultivated (~500.000
tons/year) for human food and commercial extracts.
Although phylogenetically related, the two species
are ecologically distinct and have strikingly different
distributions, morphologies and reproductive
strategies. Spores of U. pinnatifida are produced
in a specialized sporophyll that is localized on the
lower part of the stipe whereas in U. peterseniana the
sporophylls differentiate directly from the blades,
which is a process similar to that for species of the
genus Saccharina, another common kelp genus.
We produced draft genomes for U. peterseniana and
U. pinnatifida; with the previously released draft
genome of Saccharina japonica, they represent the
only genomic resources available for the kelps. We
examined gene content, genome organization, and
transposable elements dynamics. We will discuss
the genomic differences between U. pinnatifida and
U. peterseniana, and we will describe new insights
into their evolutionary history; most notably, we
will comment on the origin of multicellularity in the
brown algae. Finally, the genome sequences for the
two edible algae should be a new, major resource for
kelp crop improvement and biotechnology.
NEW GENOMES OF UNICELLULAR HOLOZOANS SHED LIGHT ONTO THE ORIGINS OF
COMPLEX ANIMAL GENE ARCHITECTURE
Grau-Bové X.1,2, Ruiz-Trillo I.1,2,3
1
- Institut de Biologia Evolutiva (UPF-CSIC)
2
- Universitat de Barcelona
3
- Institució Catalana de Recerca i Estudis Avançats
xavier.graubove@gmail.com
The origin of animal multicellularity is a major
event in eukaryotic evolution. Metazoans share
many novelties in genome content and structure
related to their multicellular lifestyle, like gene
families (transcription factors and specific signaling
pathways) and regulatory mechanisms (alternative
splicing or enhancer-enabled introns). Since many
of these traits predate metazoans, the study of their
unicellular holozoan relatives is key to understand
animal origins. We analyse the evolution of gene
architecture using new ichthyosporean genomes,
choanoflagellates and the filasterean Capsaspora
owczarzaki, plus 40 other eukaryote genomes.
This two-fold analysis focuses on the evolution of
1) intron/exon structure and 2) protein domain
architectural rearrangements (which define gene
families’ function and diversification). Animals
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malhamensis, greek, selection, poterioochromonas, flagellate, algan, feeding, trophic, chlorella, mix
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