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Morphology, taxonomy and genetic of tropical diatom Pseudo-n

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on 19 December 2013

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Transcript of Morphology, taxonomy and genetic of tropical diatom Pseudo-n

Morphology, taxonomy and genetic of tropical diatom Pseudo-nitzschia species (Bacillariophyceae) in Malaysian waters
Taxonomy of Pseudo-nitzschia and description of 4 novel species
Diversification of Pseudo-nitzschia
- new records of Pseudo-nitzschia species in Malaysia

- discovery of novel species, P. batesiana, P. circumpora, P. fukuyoi and P. lundholmiae; number of dividing sectors and cingular bands structure serves as diagnostic features for P. pseudodelicatissima complex,

- ITS2 region together with secondary structure information proved to be useful in resolving the phylogeny of Pseudo-nitzschia especially species complexes,

- Malaysian strains of P. brasiliana have low geographical pattern in genetic differentiation, no speciation though geographically isolated,

- P. pungens strains from tropical and subtropical were genetically isolated from temperate strains, speciates into three different varieties,

- species richness of marine phytoplankton especially Pseudo-nitzschia is high

Lim Hong Chang (11011542)
Faculty of Resource Science and Technology

Amnesic Shellfish Poisoning (ASP)
P. lundholmiae Lim, Teng, Leaw & Lim, 2013
P. mannii Amato & Montresor, 2008
P. micropora Priisholm, Moestrup & Lundholm, 2002
P. multiseries (Hasle) Hasle, 1995
P. multistriata (Takano) Takano, 1995
P. obtusa (Hasle) Hasle & Lundholm, 2005
P. prolongatoides (Hasle) Hasle, 1993
P. pseudodelicatissima (Hasle) Hasle, 1993
P. pungens (Grunow ex Cleve) Hasle, 1993
P. pungens var. aveirensis Lundholm, Churro, Carreira & Calado, 2009
P. pungens var. cingulata Villac, 1998
P. pungiformis (Hasle) Hasle, 1993
P. roundii Hernandez-Becerril & Diaz-Almeyda, 2006
P. seriata (Cleve) Peragallo, 1899
P. sinica Qi, Ju, & Lei, 1994
P. subcurvata (Hasle) Fryxell, 1993
P. subfraudulenta (Hasle)Hasle, 1993
P. subpacifica (Hasle) Hasle, 1993
P. turgidula (Hustedt) Hasle, 1993
P. turgiduloides (Hasle)Hasle, 1996
Pseudo-nitzschia americana (Hasle) Fryxell, 1993
P. arenysensis Quijano-Scheggia, Garcés, Lundholm, 2009
P. australis Frenguelli, 1939
P. batesiana Lim, Teng, Leaw &Lim, 2013
P. brasiliana Lundholm, Hasle & Fryxell, 2002
P. caciantha Lundholm, Moestrup & Hasle, 2003
P. calliantha Lundholm, Moestrup & Hasle, 2003
P. circumpora Lim, Leaw & Lim, 2012
P. cuspidata (Hasle) Hasle, 1993
P. decipiens Lundholm & Moestrup, 2006
P. delicatissima (Cleve) Heiden, 1928
P. dolorosa Lundholm & Moestrup, 2006
P. fraudulenta (Cleve) Hasle, 1993
P. fryxelliana Lundholm, 2012
P. fukuyoi Lim, Teng, Leaw &Lim, 2013
P. galaxiae Lundholm & Moestrup, 2002
P. granii (Hasle) Hasle, 1974
P. hasleana Lundholm, 2012
P. heimii Manguin, 1957
P. inflatula (Hasle)Hasle, 1993
P. linea Lundholm, Hasle & Fryxell, 2002
P. lineola (Cleve) Hasle, 1965
i. To examine and characterize the morphology of Pseudo-nitzschia species in Malaysian coastal waters,

ii. To determine the morphological variations and taxonomy of Pseudo-nitzschia within P. pseudodelicatissima complex sensu lato,

iii. To analyze the phylogenetic relationships of Pseudo-nitzschia using several selected genetic markers,

iv. To characterize the inter- and intraspecific variations in Pseudo-nitzschia using ITS1-5.8S-ITS2 rDNA, and

v. To investigate the genetic structure and gene flow of Pseudo-nitzschia natural populations.
Step 2
Step 3
Step 5
Step 4
Step 1
Samples and cultures
Species identification
ITS2 secondary structure
Sequence alignments
DNA extractions
DNA amplifications
Step 6
Phylogenetic analyses
Novel findings...
Pseudo-nitzschia brasiliana
Pseudo-nitzschia dolorosa
Pseudo-nitzschia micropora
Pseudo-nitzschia pungens
Pseudo-nitzschia circumpora HC Lim, CP Leaw et PT Lim sp. nov.
Type locality: Sungai Santubong, Kuching,
Sarawak, Malaysia

Etymology: derived from the circular pore
arrangement in each poroid

Diagnostic features: unique pore arrangement,
number of dividing sector
Novel findings...
Pseudo-nitzschia batesiana HC Lim, ST Teng, CP Leaw et PT Lim sp. nov.
Type locality: Teluk Batik, Perak, Strait of
Malacca, Malaysia

Etymology: named in honor of Stephen S.
Bates (Canada)

Diagnostic features: cell overlapping, cingular
Novel findings...
Pseudo-nitzschia lundholmiae HC Lim, ST Teng, CP Leaw et PT Lim sp. nov.
Type locality: Teluk Batik, Perak, Strait of
Malacca, Malaysia

Etymology: named in honor of Nina Lundholm

Diagnostic features: lower number of dividing
Novel findings...
Pseudo-nitzschia fukuyoi HC Lim, ST Teng, CP Leaw et PT Lim sp. nov.
Type locality: Teluk Batik, Perak, Strait of
Malacca, Malaysia

Etymology: named in honor of Yasuwo Fukuyo

Diagnostic features: central sector
- MoHE for MyBrain15 MyPhD Scholarship

- MoHE Fundamental Research Grant Scheme (FRGS)
06(12)/677/2008(10); eScience Fund 04-01-09-SF0092; MoHE Malaysian-JSPS Matching Fund and RACE to PT Lim

- eScience Fund 02-01-09-SF0054; International Foundation of Science (IFS) E4745-1 to CP Leaw
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