Molecular Characterization Of Pigment Producing Fungi Biology Essay

Traditional method of categorization and designation of Fungi has relied upon microscopic characteristics, settlement features on unreal media and biochemical reactions ( 1 ) . Such attacks have served in past but these methods have major drawbacks as these methods can non be applicable for non arable beings and besides on occasion biochemical feature of some beings do non suit into forms of any known genus and species, Hence specializer cognition is needed to distinguish big and complex genera such as Penicillium, Aspergillus and Fusarium ( 2 ) Recently there have been world-wide involvement on molecular techniques ( 3 ) Amplification and sequencing of mark parts within the ribosomal DNA cistron composite has emerged as a utile adjunctive tool for the designation of Fungis and does non depend on mold monogenesis for designation ( 4, 5, 6 and 7 ) . The internal transcribed spacer ( ITS ) parts 1 and 2 located between the extremely conserved little ( 18S ) and big ( 28S ) ribosomal fractional monetary unit cistrons in the rRNA operon are known to hold sufficient sequence variableness to let designation to the species level for many Fungis ( 4, 5, 6, 7, 8 and 9 ) .

In the present surveies we are describing the isolation and designation of pigment bring forthing isolate klmp51 with the aid of partial 18S rRNA sequence analysis and finding its phyletic relationship.

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Sabouraud Dextrose Agar ( SDA ) : The ingredient of the media was procured from Hi-media Mumbai, India. The composing of the media was ( g L?1 ) : Dextrose 40 ; Peptone 20 ; Agar 20 ; pH 5.6 + 0.2.

Isolation and showing

Assorted dirt samples from different parts of Gulbarga, India were collected. The dirt samples were serially diluted by consecutive dilution method. 0.1ml from 10-3, 10-4and 10-5 dilution tubing were

transferred to SDA media and spread over the full surface of the media utilizing spreader and incubated for a hebdomad at 270C. 0ver 59 Fungis were isolated and named as klmp1-59 of which klmp51 produced ruddy pigment which was transferred on the fresh media and stored for farther usage.

Isolation of genomic DNA and 18S rRNA sequencing Genomic DNA Isolation

The genomic DNA was isolated by reassigning 1.5 milliliter of the civilization to a micro extractor tubing and centrifuged for 2 min. Then the supernatant was discarded and the pellet was rhenium suspended in 467?l TE buffer by perennial pipetting, so 30?l of 10 % SDS and 3?l of 20 mg/ml protease K were added and incubated for 1 hour at 37 & A ; deg ; C. After incubation an equal volume of trichloromethane was added and assorted good by inverting the tubing until the stages are wholly assorted. Carefully the DNA/phenol mixture was transferred into a fresh tubing and centrifuged for 2 min. The upper aqueous stage was transferred in to a new tubing. An equal volume of trichloromethane was added once more

assorted good and reassign to a new tubing and centrifuged for 2 min. The upper aqueous stage was transferred to a new tubing. Then 1/10 volume of Na ethanoate and 0.6 volumes of isopropyl alcohol was added and assorted gently until the DNA precipitates. The Deoxyribonucleic acid was spooled onto a glass rod ( or Pasteur pipette with a heat-sealed terminal ) . The Deoxyribonucleic acid was washed by dunking the terminal of rod into 1 milliliter of 70 % ethyl alcohol for 30 sec. The Deoxyribonucleic acid was rhenium suspended in 100-200?l TE buffer.

PCR elaboration of 18S rRNA

PCR elaboration of 18S rRNA cistron, from the purified genomic Deoxyribonucleic acid was carried out utilizing the primer sets. Forward primer ITS5 ( 5′-GGAAGTAAAAGTCGTAACAAGG-3 ‘ ) and change by reversal primer ITS4 ( 5’-TCCTCCGCTTATTGATATGC -3 ‘ ) . The PCR status

PCR merchandise purification

The unpurified DNA sample was dissolved ( at least 10-15?l ) in 50?l of PCR killing solution and incubate at 55 & A ; deg ; C for 15-20 proceedingss. The mixture was Centrifuge at 12000 revolutions per minute for 15 proceedingss, during which clip the contaminations was released into the supernatant and the supernatant was discarded at the terminal of the centrifugation. Further the Deoxyribonucleic acid was precipitated by the add-on of 600?l of 80 % ethyl alcohol and centrifugation at the same conditions as earlier. The residuary killing solution and the contaminations were removed along with ethyl alcohol by flinging the supernatant. Finally, the DNA pellet was dried and dissolved in 10-15?l of Milli Q H2O.


The sequencing of the mark cistron was done utilizing BigDye Chemistry, and was performed as per the maker ‘s protocols ( Applied Biosystems 3730xl DNA Analyzer ) the tubing was placed in

the thermic cycler. The thermo cycler was programmed as follows: 25 rhythms of [ 96o C for 10 sec, 50o C for 5-10 sec, 600C for 4 min ] , so rage to 40C.

Purification of sequencing extension merchandise by isopropanol precipitation method

The tubing was spin and transferred by pipetting full sequencing reactions into 1.5 milliliters micro extractor tubing. Then 40 milliliters of 75 % isopropyl alcohol, or 10 milliliter of de ionised H2O and 30 milliliter of 100 %

isopropyl alcohol was added and mixed by vortexing and left at room temperature for & A ; gt ; 15 min to precipitate merchandises. The tubing was centrifuged for a lower limit of 20 min at maximal velocity in a micro extractor. The supernatant was aspirated wholly with a separate pipette tip for each sample, being careful non to upset the DNA pellet, and so it is discarded. About 125 to 250 milliliter of 75 % isopropyl alcohol was added to the tubing and whirl briefly and centrifuged for 5 min at maximal velocity, and the supernatant was aspirated as in above measure. The sample was dried for 10 – 15 proceedingss and stored at -200C until ready for cataphoresis. The purified extension merchandises were separated in the ABI 3730xl DNA Analyzer by Capillary Electrophoresis. Sequence data analysis was done utilizing ChromasPro and Sequencing Analysis package. The isolation of genomic DNA and sequencing Fig.1, Fig.2.was performed at Ocimum Bio Solution, Hyderabad, India.

The analysis of nucleotide sequence was done in Blast-n site at NCBI waiter ( hypertext transfer protocol: // ) .The alliance of the sequences was done by utilizing CLUSTALW ( ) Fig.3.

Fig 3. Partial 18S frontward and change by reversal assembled sequence of isolate klmp51

Phylogenetic analysis

A phylogentic analysis of the isolate klmp51 was performed to find how the 18S rRNA sequence of the isolate klmp51 and related strain might hold been derived during development. The evolutionary relationships among the sequences were depicted by puting them as outer subdivisions on a phyletic tree. The ramifying relationships on the interior portion of the tree reflect the grade to which different sequences are related. Sequences that were really much alike were located as adjacent outside subdivisions and joined to a common subdivision beneath them. The aim of phyletic analysis is to happen out all of the ramifying relationships in the tree along with branch lengths. For this phyletic tree was constructed utilizing the aligned sequences by the neighbour fall ining method utilizing Kimura-2-parameter distances in MEGA5 package [ 10 ] . Distances between the studied sequences helps in understanding the evolutionary distances among the species.

Standards for species designation

Designation of species through sequence similarity footing was performed harmonizing to standards used by [ 11 ] which states the undermentioned choice parametric quantities: ( a ) when the per centum similarity of the question sequence and the mention sequence is 99 % or above, the unknown isolate would be assigned to cite species ; ( B ) when per centum similarity is between 95 – 99 % , the unknown

isolate would be assigned to the corresponding genus ; ( degree Celsius ) when per centum similarity is less than 95 % , the unknown isolate would be assigned to a household.

Consequences and treatment

Designation and phyletic place of isolate klmp51 The designation was done based on 18S rRNA cistron sequencing. The 18S rRNA sequence of the isolate klmp51was compared with the informations nowadays in NCBI. The BLASTn of the isolate klmp51 was demoing 100 % homology with the Lasiodiplodia spp. The sequence was submitted to the Gene Bank under the accession figure JQ073734. To analyse the phyletic place of the 18S rRNA sequence. The phyletic tree was constructed utilizing Mega5 by neighbor-joining tree utilizing Kimura-2-parameter with 1000 bootstrap reproduction. The phylogentic relation was determined Fig. ( 4 ) .Shows the phyletic relationship between the isolate klmp51 and other related Fungis. The homology assay consequence indicated the isolate klmp51 were in the phyletic subdivision of Lasiodiplodia spp. The isolate showed a singular ruddy pigment on SDA ( Plate.1 ) , which may be used in grocery, dyestuff, cosmetics and pharmaceutical fabrication procedures. Fig 4. Phylogenetic tree of Isolate klmp51 demoing homology with Lasiodiplodia spp. Numbers near the nod part represents the bootstrap value, while Aspergillus niger as a outer group. Plate 1. a ) Control B ) Red pigment production by Lasiodiplodia klmp51 in SDA


From this survey we have concluded that the isolate klmp51 belongs to Lasiodiplodia spp. based on Molecular taxonomy and evolution. Lasiodiplodia klmp51 produced a ruddy pigment which may be used as a bio-color in dyestuffs, groceries and in decorative industries.


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