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group other than the y-Proteobacteria. Therefore, this species was used as the outlier group in the phylogeny to root the tree. The multiple sequence alignment from PileUp was transferred into ClustalX 1.64b (Higgins et al., 1996). which was used to create a Phylip file for the production of the phylogenetic tree using the default weight parameters to produce a sequence distance matrix, which estimated the evolutionary distance of a particular pair of sequences based on differences in base pair substitutions. GeneDoc (Nicholas and Nicholas, 1997) was then used to examine and demonstrate that the alignment was correct by directly comparing the aligned sequences. Tree Puzzle version 4 (Strimmer and von Haeseler, 1996) was then used to analyse the phylogeny and compute the maximum likelihood tree, i. e. the tree that best fits the sequence data. The maximum likelihood algorithm corrects for the superposition of multiple mutations at a single sequence position, so that the observed number of nucleotide differences do not underestimate the number of mutational events that may have occurred since the evolutionary separation of the genes (Olsen et al., 1986). The tree was created using the assumption that all the genes used in the alignment are mutating at a similar rate. The maximum likelihood tree was then viewed using TreeView 1.6.6 (Page, 2001) (Fig 5.4). It must be stressed that due to time limitations this may not be the most optimal tree, i. e. it may not be the best representation of the data. However, it is a good approximation of the phylogenetic relatedness of the taxa. The phylogenetic tree (Fig 5.4) shows a similar pattern of relatedness to the ARDRA analysis (Fig 5.2a & b). Both isolates 302 and 33 cluster together in the Pseudomonas group. Isolate 732 clusters with the Enterobacteriaceae indicating its near identical similarity with Enterobacter agglomerans (syn. Pantoea agglomerans). also being closely related to Escherichia coll. Both isolates 86 and 39 cluster with Pseudoalteromonas sp. (Alteromonadaceae) as the most closely related group to the Enterobacteriaceae. The next group to join this clustering is the Idiomarina loihiensisf isolate 53 group (Alteromonadeceae). The Alteromonadeceae / Enterobacteriaceae group then joins on to the rest of the phylogeny, which comprises the Moraxellaceae family (Psychrobacter, Moraxella and isolate 583), Oceanospirillium group family (Marinotnonas protea taxon) and the Halomonadaceae family (Halomonas sp. and Arctic seawater bacterium). The Halomonadaceae family represent isolate 213 which could not 140
Isolate number Closest phylogenetic relatives used in phylogenetic tree analysis. 124,154,214,5ice3,54,744,794 Marinomonas protea (AJ2 X8597) 86,39 Pseudoalteromonas sp (U85856) 494 Sphin omonas sp (AF395031) 213 Halomonas sp (ABO 16049) Arctic seawater bacterium (AJ293828 ) 302 Pseudomonas fluorescens (AF228 367) Pseudomonas azotoformans (D84009) Pseudomonas putida (ABO16428) 33 Pseudomonas sp MBIC3 (AB021318) 53 Idiomarina loihiensis (AF288370) 492,47 Stenotrophomonas maltophilia (AJ293464) Xanthomonas sp 1018 (AB054969) 583 Psychrobacter sp (AJ272303) Moraxella lacunata (AF05169) 732 Enterobacter agglomerans (AF348161) Pantoea agglomerans (AJ233423) Citrobacter freundii (AF025365) Escherichia coli (JO1859) Table 5.3 Table - shows the close relatives used for creation of a maximum likelihood phylogenetic tree. Also shows which isolates (from the current study) that the relatives relate to. Isolate 466 was not used in the phylogenetic tree as no close relative could be ascertained from the available sequence. 141
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COLD ADAPTATION STRATEGIES AND DIVE
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, 71 "If you march your Winter Jour
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1.6.3. Molecular typing techniques
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3.2.1.2.3. DOC and chlorophyll a ..
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5.3.2.5. The Sphingomonas group, is
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LIST OF FIGURES Figure I. I. Diagra
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Figure 3.17a Mean bacterial abundan
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LIST OF TABLES Table 1.1. Types of
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List of Abbreviations AFP AFGP AFLP
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ACKNOWLEDGEMENTS This study was fun
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Chapter 1: INTRODUCTION 1.1 - Tempe
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1999 ; Hand & Burton, 1981) or iden
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Cold adaptation is dependant on the
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not at 25°C is a function of the a
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The most prolific literature on col
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process known as thermal hysteresis
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dominant, role in the ice-growth in
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explanation for this diversity is t
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1.5.3.5 - Membrane bound solute tra
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een well established (Russell & Nic
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& Bowman, 2001; Labrenz & Hirsch, 2
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The reaction mix contains both deox
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gene mixtures and hence can be used
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displaying a high number of common
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AACGTCGAAA AACCTCGAAA (Organism A)
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particular set of environmental par
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Lake Maximum Depth (m) Approximate
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Larsemann Hills __ rp3rtrnent of th
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Sampling trips took two days during
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Sigma, Sigma-Aldrich Company Ltd.,
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oxidized and the sample then conver
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sample. An appropriate volume was l
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min to ensure complete extension of
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Figure 2.3 - Lane delineation image
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Figure 2.6b - Molecular weights are
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RNA 41F (5'-GCT CAG ATT GAA CGC TGG
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I min. The spin column was removed
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compiled using Seqman and any erron
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ecorded and related to the level of
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information regarding the cold adap
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50ppt to 186ppt. Thirteen were sali
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M N N 't M M \p \p 00 kf) M kf) bA
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as would normally be expected, as b
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1444 6ý L CC vý O Q O O NO u 'c z
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5 - 250 3 245 240 G (, -3 235 a 0-
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3.2.2.2.5 - Dissolved organic carbo
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d 14 12 10 14 12 7 10 8 6 4 2 0 00/
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SRP ('g L- 05 10 15 20 2 3 Depth4 5
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3.2.2.3 - Biological characteristic
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a 0 Bacterial Abundance (x 106 ml-1
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3.3 - Discussion 3.3.1 - Summer sam
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to high surface water temperatures
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chemocline (Rankin et al., 1999). M
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a 250 200 150 100 50 70 60 50 40 ý
Page 109 and 110: The temperature (Fig 3.2a) through
Page 111 and 112: et al., 1999). No melt out was obse
Page 113 and 114: increase in ammonium is probably du
Page 115 and 116: 10 7 9 6 8 E ö 7 5 Co u c m c 40 w
Page 117 and 118: main pigments were chlorophylls a a
Page 119 and 120: Inorganic nitrogen (NO2, NO3 and NH
Page 121 and 122: 744 -- 7 644 6 19 ü SE 400-- 4 2s
Page 123 and 124: salinity decreased from July to Sep
Page 125 and 126: a Bacterial abundance (x 106 1.1) 0
Page 127 and 128: 8 ö a N Ö oý L _> Q O O 4 0 rn O
Page 129 and 130: undoubtedly true of Club Lake. The
Page 131 and 132: suggested that input of bacteria an
Page 133 and 134: Pendant Lake is an unstratified, sa
Page 135 and 136: non-AFP active peptides from inhibi
Page 137 and 138: . ter rý :. 'ý Figure 4.2 -Fryka
Page 139 and 140: -ý- ---- ,. r. __-_-. ___. r. ýý
Page 141 and 142: 4.2 - Results 4.2.1 - Sampling and
Page 143 and 144: SPLAT score. It has been shown that
Page 145 and 146: 3'E t ý _d M! .PJ r rn 15 3.5 4 3
Page 147 and 148: 4.3 - Discussion Of the 866 bacteri
Page 149 and 150: arisen in very few species due to c
Page 151 and 152: Chapter 5: BACTERIAL MOLECULAR TYPI
Page 153 and 154: Fig 5.1 - Photographs of ARDRA gel
Page 155 and 156: Coefficient: Dice Algorithm: lPGMAA
Page 157 and 158: The closest published relative for
Page 159: identification was made based on 15
Page 163 and 164: e included due to its small sequenc
Page 165 and 166: 5.3.2 - Identification of the AFP a
Page 167 and 168: explains the fluctuation in related
Page 169 and 170: contamination was lower as the PCR
Page 171 and 172: seen to a certain extent in the ARD
Page 173 and 174: American Type Culture Collection (A
Page 175 and 176: Phylogenetic cluster alignment of t
Page 177 and 178: et al., 1994) and the Antarctic SIM
Page 179 and 180: Chapter 6: BACTERIAL COMMUNITY ANAL
Page 181 and 182: 6.2.1 - Detection of AFP active iso
Page 183 and 184: using the same PCR protocol as orig
Page 185 and 186: Figure 6.1 - Denaturing gradient ge
Page 187 and 188: 6.2.2 - Temporal and spatial variat
Page 189 and 190: Figure 6.4c - Gel I image showing b
Page 191 and 192: Coefficient: Dice Algorithm: UPGMA
Page 193 and 194: etween Om and 2m was obviously the
Page 195 and 196: All PCR-based rRNA molecular techni
Page 197 and 198: 6.3.2.3 - Cellular lysis and DNA pu
Page 199 and 200: hybrids should be equal. However, S
Page 201 and 202: contain contaminants. If the profil
Page 203 and 204: (Section 6.3.2.4.3 ) could not be r
Page 205 and 206: most dominant species in the commun
Page 207 and 208: study was characterised as M protea
Page 209 and 210: 11 species) showed AFP activity. Th
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that AFP activity could have evolve
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7.2 - Future Work The 19 AFP active
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REFERENCES ABYZOV, S. S. (1993). Mi
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BELL, E. M. and LAYBOURN-PARRY, J.
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Symposium on Environmental Biogeoch
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Research. 5,477-493. CLESCERI, L. S
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DRICKAMER, K. (1999). C-type lectin
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antifreeze proteins from Atlantic s
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FRANZMANN, P. D. and DOBSON, S. J.
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GRIFFITH, M., ALA, P., YANG. D. S.
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IVANOVA, E. P., KIPRIANOVA, E. A.,
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Antarctic Ecosystems. G. A. Llano (
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Howard-Williams and I. Hawes). Balk
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W. (1998). Rep-PCR-mediated genomic
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putida strains from Antarctica. Mic
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NICHOLS, D., BOWMAN, J., SANDERSON,
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PEARCE, D. A. and BUTLER, H. G. (20
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(1999). Palaeohydrological modellin
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tracers of biogeochemical processes
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R. G. Landes Company, Austin, Texas
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partial 16S rDNA sequencing. Applie
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YABUUCHI, E., WANG, L., ARAKAWA, M.
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APPENDICES Al. Media Tryptic Soya A
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"D C 'O I. .. r .. r 6 rr E , 4mo .
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. + + + I I I I I I + I + + I I I I
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Ö ON N M 1 O - N 'zt "o l'" 00 C N
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1 T 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 I 1 + I I 1 I 1 1 I 1 1 1 I
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1 1 1 1 1 1 1 I I 1 I 1 I 1 1 I T I
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Cl M 'tt tn '. p t- 00 O\ N M O - (
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d' O - (N M 'nt V) \O N. 00 O> N M
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1 1 T 1 1 1 T 1 1 1 1 1 1 1 1 1 1 1
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+ + i i i i i i " i " . + + + + " +
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e O --ý N M t Vn 1,0 [-- 00 O> N M
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FT ce + I I r. to \, O t- 00 O\ N M
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kn 110 r- 00 Oý N M O - N M Itt vn
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, It N M "t N M Iýt N M M M M Oý
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gj a - - - - - - - - - - - - - - -
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