Current World Environment

Introduction

In a world dazzled by scientific discoveries and technological advances leading to better living standards, the negative consequence of such developments are beginning to emerge and come into focus. Microorganisms perform their metabolic processes rapidly and with remarkable specificity under ambient conditions, catalyzed by their diverse enzyme mediated reactions. Enzyme alternatives to harsh chemical technologies has led to intensive exploration of natural microbial biodiversity to discover enzyme which could function effectively and generate pollution-free “dream technologies” in the immediate future. (Srinivasan et al., 1999).

We live on "a microbial planet" (Woese, 1999) in the "Age of Bacteria" (Gould, 1996). Micro-organisms, the first cellular life forms, were active on earth for more than 3.0 billion years before the development of multi-cellular, macroscopic life forms.  During that time and continuing into the present, through the invention of a spectacular array of different metabolic and physiological capabilities, microbes evolved to exploit the multitude of environments and microhabitats presented by the abiotic world.  Rapidly accumulating evidence indicates that microbe’s most likely account for the vast majority of kinds of organisms on earth.  Microbes carry out a stunningly diverse array of metabolic activities, several of which were instrumental in creating conditions for the evolution of other life forms.

Estimates of 1.7 million species have been described to date; estimates for the total number of species existing on earth at present vary from 5 million to nearly 100 million. Fungi are second largest group of living biota available in the world after insects.  The currently known fungal species are around 72,036 species and in India 27,000 fungi were encountered (Manoharachary, 2002).

The number of fungi recorded in India exceeds 27,000 species, the largest biotic community recorded after insects (Sarbhoyet.al., 1996). The true fungi belong to kingdom Eukaryota which has 4 phyla, 103 orders, 484 families and 4,979 genera. A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms.Fungi perform an essential role in the decomposition of organic matter and have fundamental roles in nutrient cycling and exchange. They have long been used as a direct source of food, such as mushrooms and truffles, as a leavening agent for bread, and in fermentation of various food products, such as wine, beer, and soy sauce. Since the 1940s, fungi have been used for the production of antibiotics, and, more recently, various enzymes produced by fungi are used industrially and in detergents. Fungi are also used as biological agents to control weeds and pests. Many species produce bioactive compounds called mycotoxins, such as alkaloids and polyketides, which are toxic to animals including humans. Their growth is probably related to their ability to grow at 28°C and produce protein and fat hydrolyzing enzymes. Soil fungi have been recognized chiefly by two methods; direct examination and isolation by cultural methods. The limitations of the first method are obvious, and although it has produced many excellent results, the physical barriers in the way of such a method limit its usefulness, and in most cases such observations as were made by it were confirmed by resort to cultural methods. In the second method, that of isolation of cultures, has been more widely used and has produced the greater numbers of species of recognized soil fungi. The substrate used in making the isolation is of prime importance in determining the species that will be taken cannot be denied. The remarkable discovery of Coker and his associates that many species of saprolegniales are seemingly present in a very wide range of soils and localities was the result of the application of the techniques and materials used to isolate this group of fungi from water samples.

Figure 1 Click here to View figure

Biodiversity refers to the variability of life on Earth, all the living species of animals, plants and microorganisms. According to Hawksworth (2002), fungi are a major component of biodiversity, essential for the survival of other organisms and are crucial in global ecological processes. Fungi being ubiquitous organisms occur in all types of habitats and are the most adaptable organisms. The soil is one of the most important habitats for microorganisms like bacteria, fungi, yeasts, nematodes etc. The filamentous fungi are the major contributors to the soil biomass (Alexander 1977). They form the major group of organotrophic organisms responsible for the decomposition of organic compounds. Their activity participates in the biodeterioration and biodegradation of toxic substances in the soil (Rangaswamiet al., 1999). It has been found that more number of genera and species of fungi exist in soil than in any other environment (Nagmaniet al., 2005).  Contributing to the nutrient cycle and maintenance of ecosystem fungi play an important role in soil formation, soil fertility, soil structure and soil improvement (Hao-quinet al., 2008). Fungi take a very important position in structure and function of ecosystem. They decompose organic matter from humus, release nutrients, assimilate soil carbon and fix organic nutrients. An intense study of abundance and diversity of soil microorganisms can divulge their role in nutrient recycling in the ecosystem.

Materials and Methods

Selection of Sample Sites

Fourteen different sites in various villages of in and around vicinity of Ludhiana were selected as shown in table-1 (given in supplementary sheets).

Collection of Soil Sample

Different types of soil samples viz. waste soil (W), dump soil (D), Leaf litter (L),   decomposing organic manure (M) etc were collected. Samples (500gm) were suspended in sterile polythene bag and thoroughly packaged and kept at 4ËšC.

Figure 2 Click here to View figure

Isolation of Fungi

Samples were stored in the refrigerator at 4ËšC till the isolation of fungi.  For isolating Fungi, the PDA media (solution containing all the nutrients required for the growth of microorganisms) was added with 50 g/ml tetracycline to suppress bacterial and in the isolation plates. Medium supplemented with various chemicals components was inoculated and incubated at 28 ËšC.  

Media (g/l)

• Potato (Peeled)   -    200
• Dextrose             -     10
• Agar                    -     15
• pH                       -     5.6
• Distilled Water    -    1000 ml

Purification of Fungal Strains

After 4 days of incubation Fungal colony started appearing as separated on PDA medium and it was further incubated for 4 days at 28ËšC. The purified colonies were aseptically picked up and transferred to PDA slants. The slants were incubated at 28ËšC for 4-5 days for maximum growth. The slants were then stored at 4ËšC in the refrigerator.

Table 1: Selection of Samples Sites

S. No.	Name of The Site	Site Code
1	Vill. KoharaTeh: Distt Ludhiana	KO
2	Vill.JandialiTeh: Distt Ludhiana	JA
3	Vill. RamgarhTeh: Distt Ludhiana	RA
4	Vill. TajpurTeh: Distt Ludhiana	TA
5	Vill. SuneetTeh: Distt Ludhiana	SU
6	Vill. LaltoTeh: Distt Ludhiana	LA
7	Vill. JhabewalTeh: Distt Ludhiana	JH
8	Vill. AyaliKhurdTeh: Distt Ludhiana	AKH
9	Vill. Ayali KalanTeh: Distt Ludhiana	AKA
10	Vill. MundianKhurdTeh: Distt Ludhiana	MKH
11	Vill. Mundian KalanTeh: Distt Ludhiana	MKA
12	Vill. MangliucchiTeh: Distt Ludhiana	MUC
13	Vill. BastijhodewalTeh: Distt Ludhiana	BJO
14	Vill. Sunder nagarTeh: Distt Ludhiana	SU

Maintenance of Pure Culture

Samples were stored in the refrigerator at (4ËšC) for the identification of fungi.

Physico-Chemical Analysis Effect of pH on the Growth of Fungalcolonies

The fungal samples were grown at different pH ranges (3, 7 and 9) to check the effect of pH on their growth. The diameter (mm) of the fungal colonies was measured at different time intervals.

Effect of Temperature on the Growth of Fungalcolonies

The fungal samples were grown at different temperature ranges (25ËšC, 35ËšC, 45ËšC) to check the effect of temperature on their growth.  

Bio-Chemical Screening of Samples  Amylase Assay

Screening was done as per the method of Behlet al., (2006) and Rele (2004). Screening of fungal culture for enzyme activity was carried out on agar media on petri plates containing 1 % soluble starch. After solidification of medium around 10 mm well was cut out aseptically with the help of cork borer. The well was filled with crude enzyme extract and incubated at 28ËšC for 96 hrs in an upright position. The plates were flooded with Gram’s iodine solution and observations were made to see clear zone around the well. A negative control was maintained by adding heat denatured crude enzyme sample. Denaturation was done by boiling enzyme extract at 110ËšC for 20 min and then cooled suddenly in an ice bath for 5 min. After flooding with Gram’s iodine solution a clear area around the line of growth indicates starch hydrolysis

Cellulase Assay

Screening was done as per the method of Waksman and Fred (1922).  Screening of fungal culture for enzyme activity was carried out onCzapekDox Agar Medium petri plates. After solidification of medium around 10 mm well was cut out aseptically with the help of cork borer. The well was filled with crude enzyme extract and incubated at 28ËšC for 96 hrs in an upright position. The plates were flooded with 0.1% Congo red dye solution andobservations were made to see clear zone around the well. A negative control was maintained by adding heat denatured crude enzyme sample. Denaturation was done by boiling enzyme extract at 110ËšC for 20 min and then cooled suddenly in an ice bath for 5 min. After flooding with 0.1% Congo red dye solution a clear area around the line of growth indicates starch hydrolysis.

Table 2: Effect of different pH rangeon the growth of fungal sp.

Time	Aspergillusglaucus			Aspergillusfumigatus			Fusarium sp
	pH-			pH-			pH-
	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9
24 hrs	0	2	2	0	1.5	0.5	0	2.5	2.5
48hrs	0	3.5	3	0	2.5	2.5	0	3.5	5.8
72hrs	0.5	4.8	7.5	0	4.5	4.5	0	4.8	7
96hrs	1	9.5	10.5	0	11.5	6.5	1.5	9	8.5
Time	Fusarium sp.			Aspergillusnidulans			Fusarium sp
	pH			pH			pH
	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9
24 hrs	0	0	1.5	0	2	2.5	0	2.5	2.5
48hrs	0	0	3	0	2.8	5.5	0	3.5	5.8
72hrs	0	2	5	0.8	6	6.5	0	4.8	7
96hrs	2.5	3.5	7.5	2	9.5	8	1.5	9	8.5
Time	Fusarium sp.			Aspergillusflavus			Aspergillusniger
	pH-			pH-			pH-
	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9	pH-3	pH-7	pH-9
24 hrs	0	0	1.5	0	1.5	0.5	0	2	1
48hrs	0	0	3	0	3	3	0	2.8	2.5
72hrs	0	2	5	1.5	7.5	7.5	0	6	4
96hrs	2.5	3.5	7.5	1.8	10.5	11	0.5	11	7

Protease Assay

Screening  was  done by sub culturing of the fungus produced on skimmed milk medium one by one onto the PDA medium and were finally transferred to PDA slants and maintained at 4°C. Proteases were screened using with fungal selective media (PDA: potato dextrose agar, malt extract, Czapek and Dox medium), containing two different protein substrate, soya meal (20 g/l) and Casein Peptone (10 g/l). These ingredients were added to induce the protease synthesis by the fungi and the growth was measured after 24hrs, 48hrs, 72hrs and 96hrs.

Identification of Cultures

The cultures were identified by studying their macroscopic appearance, pigmentation and growth rate (table-5 given in supplementary sheets). Visual examination was done to study the important characters such as colour, texture, macroscopic structures, growth zones, aerial and submerged hyphae and colony topography. The microscopic examination was made by observing the slide cultures after staining with Lacto phenol Cotton Blue. Based on these feature identification was made following Gilman’s Manual for Fungus identification (Gilman J.C 1995).  
 

Amylase screening of purified fungal strainsCellulase screening of purified fungal strains Protease screening of purified fungal strains Click here to View figure

 
Results

Physico-Chemical Characterization of Purified Fungal Strains

Effect of pH on the Growth of Fungal Colonies

The fungal samples were grown at different pH ranges (3, 7 and 9) to check the effect of pH on their growth. The diameter of the fungal colonies (mm) was measured at different time intervals.

The pH is the symbol for the logarithm of the reciprocal of the hydrogen ion concentration (Log/H⁺) in grams atoms per liter. The measure of the relative acidity or alkalinity of a solution is called pH.

pH is one of the important factor that determines the growth & morphology of microorganisms as they are sensitive to the concentration of hydrogen ion present in the medium. Each enzyme system of organisms has a particular pH range in which it can function. The pH value also serves as a valuable indicator of the initiation and end of the enzyme synthesis (Friedrich et al., 1989).

Effect of Temperature on the Growth of Fungal Colonies  

The fungal samples were grown at different temperature ranges (25ËšC, 35ËšC, 45ËšC) to check the effect of temperature on their growth. The diameter of the fungal colonies (mm) was measured at different time intervals.

Temperature is a vital biochemical factor which controls the enzymatic activities.Ninefungal strains were selected for temperature characterization study. Optimum temperature for the activity of Protease produced by Aspergillusniger sp., Aspergillusflavus sp., Fusarium sp.,was at 25-45°C respectively. The data presented in tables clearly reveals that fungal strains show maximum protease activity at 25-45°C.Ali (1992) also recorded optimum temperature of 30°C for protease produced by A. fumigatus.Fungal strains produced proteases beyond 30°C but in lesser yields than that produced at optimal temperature. These temperatures might not havebeen suitable for Enzyme production. This is in accordance with the review of Daniel et al., (2010) who stated that increase in temperature led to increase inactivity but that there was limit to the increase in activity because higher temperatures led to a sharp decrease in activity. This could be due to the denaturing of protein structure.

Purified fungal strains were physicochemical characterized to check the effect of pH (3-9) and effect of temp. (25-45ºC). Effect of pH on the growth of fungi indicates that the fungal strainswere shown the maximum growth at acidic pH i.e3. Some strains of Aspergillus were shown maximum growth at alkaline pH-9. They show the maximum growth at 4^th day of incubation with slight decrease afterwards. A pH gradient agar plates with surface pH ranging from about 3-9 was easily prepared. The gradient was sufficiently stable to permit different growth characteristics among various fungal species at different pH value to be distinguished. The pH effects on the growth rate, conidiogenisis and pigment formation were consistent with the results obtained by other workers. Wheeler et al., (1990) reported that the effect of pH on growth rate of 61 isolates of fungi. Four species of Aspergillus grows over the pH range 3-9 and temperature 37ºC. in general Aspergilluswere the most tolerant of alkaline pH. The temperature effect on fungal strains was studied at their observed optimum pH values from 3.0 - 9.0 and at different temperature ranging from (25-45ºC). Optimum temperature was found to be 25ºC for all the fungal strains. The result clearly indicates the presence of mesophilic strains of Aspergillus and Fusarium sp. The maximum growth was found to be occurs at the 4^th day of incubation. Gradually on increasing temperature up to 45ºC, the growth decreases afterwards. The colony diameter was measured regularly after the gap of 24 hrs at different temperature range.

Table 3: Effect of temp.on the growth of fungal sp. at selective pH

Time	Aspergillusglaucus			Aspergillusfumigatus			Fusarium sp.
	Temp at pH-9			Temp at pH-8			Temp at pH-6
	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC
24 hrs	9	4.5	1.5	6.5	6.5	2.5	5	4	4
48hrs	15	7.5	3	12	11	4	13	7.5	4.5
72hrs	22	15	5.5	20.5	15.5	6.5	24	13	8.5
96hrs	30	17.5	12	30	22	11.5	33.5	18.5	13.5
Time	Fusarium sp.			Aspergillusnidulans			Fusarium sp.
	Temp at pH-8			Temp at pH-6			Temp at pH-6
	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC
24 hrs	7	3.5	3.5	8	2.5	4	3.5	3.5	4
48hrs	13	11.5	4.4	15.5	6.5	5	13.5	7.5	5
72hrs	25	15	10	17.5	10	7.5	18	15	6.5
96hrs	40	16.5	12.5	24	14	14.5	26	18.5	11
Time	Fusarium sp.			Aspergillusflavus			Aspergillusniger
	Temp at pH-8			Temp at pH-6			Temp at pH-6
	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC	25ËšC	35ËšC	45ËšC
24 hrs	8.5	5	5	8.5	4.5	6.5	10.5	4.5	7.5
48hrs	12.5	11.5	7.5	15	6.5	8.5	12.5	6.5	9.5
72hrs	24	13.5	9	27	11	11.5	25	9.5	12.5
96hrs	36.5	16	14	32	15.5	15.5	34	14	16.5

Enzymatic Screening of Purified Fungal Strains  

Enzymes are the most important products obtained for human needs through microbial sources. Enzymes are highly efficient environmental friendly protein catalyst synthesized by living systems. They have significant advantage over chemical catalyst in terms of catalytic activity, ability to work at moderate temperature and the ability to get produced in large amounts (Chand & Mishra, 2003). Dr. JockichiTakamine (1914) was the first indiviual to realize the mechnical possibility of cultivated enzymes and presented them to society. Although he was mainly concerned with fungal enzymes, Boidin and Effront (1917) were pioneers in the output of enzymes produced by bacteria. Since that time microbial enzymes have taken the place of enzymes from plants and animals (Underkofler, et al. 1957).

Table 4: Enzymatic screening of purified fungal strains [Colony diameter (mm) was measured]

S. No.	Identified Fungal Strain	Amylase Screening Starch Hydrolysis Test	Cellulase Screening Congo Red Dye Test	Protease Screening
1	Aspergillusglaucus	+ (1.5 mm)	+ (2.0 mm)	-
2	Aspergillusfumigatus	_	+ (1.0 mm)	+ (8.5 mm)
3	Fusarium sp.	+ (1.5 mm)	+ (2.0 mm)	+ (9.5 mm)
4	Fusarium sp.	+ (1.0 mm)	+ (2.0 mm)	+ (9.0 mm)
5	Aspergillusnidulans	_	_	+ (10.5 mm)
6	Fusarium sp.	+ (1.5 mm)	+ (2.0 mm)	+ (8.0 mm)
7	Aspergillusflavus	+ (1.5 mm)	+ (1.5 mm)	+ (7.5 mm)
8	Aspergillusniger	+ (1.0 mm)	+ (2.0 mm)	+ (8.0 mm)
9	Fusarium sp.	+ (2.5 mm)	+ (2.0 mm)	+ (8.0 mm)

A total of 9 fungal strains were purified from different soil samples and enzymatic screening was performed at optimum pH and temperature. The results indicate that number of microbial forms has multiple occurrences and additionally, they have the capacity to produce amylase under optimum environmental conditions. All the purified fungal strains were screened for the enzyme production capacity viz. amylase, cellulase and protease at their recorded optimum pH and temperature. Most of the strains were potential producer of cellulase among all. Maximum enzyme synthesis occurred at the 4^th day of incubation with gradual decrease afterwards. The pH and temperature effects the enzyme activity of fungal strains. The strains of Aspergillus and Fusarium sp. were the maximum producer of enzymes.

Chellapandi (2009) reported Aspergillusflavusand Aspergillusterreusas the potential strains for production oftannery protease in submerged fermentation. To improve the productivity of protease enzyme in liquid broth, various media ingredients have been optimized. The crude and partially purified proteases preliminarily characterized and used for unhairing processes at lab scale in tannery. The protease obtained from these strains showed the good activity in wide alkaline condition at 50 ºC suggesting the possibility of using in leather and detergent industry.

Result also raises hope for purification and applications in various industrial processes. This can have important implications in proteolytic breakdown of proteins by these fungal strains for the establishment of a robust and cost effective process in various industries like brewing,baking, textiles and laundry etc.

The present study raises the hope to further characterize these fungal strains for enzymatic characterization and to be harnessed for industrial applications.

Table 5: Identification of fungal samples: Identified fungus cultures with their codes

No	Sample Sites	Characterstics	Fungal Sp
1	KO/SS/F1;MUC/SS/F1;TA/SS/F2; JH/SS/F3; BJO/SS/F2; SN/SS/F4	Growth rate is slow to moderately rapid and the texture of colonies varies from downy to powdery, conidial heads are radiate to loosely columnar. Conidiophores are smooth walled. Conidia are ellipsoidal or rounded.	Aspergillus glaucus *
2	JA/SS/F1 ; JA/LL/F1;	Colonies in the agar medium widely spread and strictly velvety. From	Aspergillus
	RA/SS/F2;MNC/SS/F3	green to dark green, becoming almost black in age. Conidiophores short, usually densely crowded. Conidia dark green in mass, globose.	fumigates**
3	RA/SS/F1; SU/SS/F2; AKH/SS/F2;	It grows as hyphae, which are cylindrical, thread-like structures. Hyphae grow at their tips (apices); new hyphae are typically formed by emergence of new tips along existing hyphae by a process called branching. Hyphae are septate which are divided into compartments separated by cross walls.	Fusarium sp***
4	TA/M/F1;SN/SS/F3;MNC/SS/F2	Colonies in the agar medium widely spread from tints of cinnamon to deeper	Fusarium sp ****
	JH/SS/F2;MKH/SS/F3	brown shades in age, spreading velvety. Conidiophores with smooth walls, septate.
5	SU/SS/F1;MKA/SS/F2	Colonies in the agar medium spreading broadly dark cress green. Conidial heads short, columnar with smooth walls. Conidia globose and green in mass.	Aspergillusnidulans^
6	LA/SS/F1 ; LA/LL/F1	Colonies in the agar medium widely spread white at first site, becoming green in 4-5 days, may show various shades of light green. Vegetative hyphae, septate. Conidiophores arise as branches of aerial mycellium.	Fusarium sp.^^
7	AKA/SS/F2; MKH/SS/F2;MKA/SS/F1;AKH/SS /F1;KO/SS/F2; RA/SS/F3	Colonies in the agar medium widely spread to scanty growth. Conidial areas ranging in colour from citron green to mignonette green. Conidiophores arise separately, broadening upward and granular. Heads in every colony vary from small with a few chains of conidia to large masses. Conidia are almost smooth.	Aspergillusflavus ^^^
8	MKH/SS/F1; SN/SS/F2;KO/SS/F3 TA/SS/F1;SU/SS/F3;LA/LL/F2;JH /SS/F4 AKA/SS/F1;MUC/SS/F2 BJO/SS/F3	Colonies in the agar medium rapidly growing, abundant submerged mycelium, conidiophores are smooth, septate. Conidial heads are blackish-brown to carbonaceous black varying from small conidial masses of a chains to globose or radiate heads.	Aspergillusniger ¤
9	JH/SS/F1; BJO/SS/F1;SN/SS/F1	Colonies in the agar medium rapidly growing, white in colour and membranous. Hyphae are septate. Conidiophores short, erect and producing conidia in chains at their apices.	Fusarium sp ¤¤

Discussion

The major goal of microbial ecology is to understand microbial diversity in natural habitats; therefore knowledge of both microorganisms and habitats is essential. A Total of 14 Sites were selected for sample collection for the isolation of the fungal strains, quantitatively the number of fungal cultures were large has been shown in table 1 and 2 respectively. A total of forty two fungal cultures were isolated from fourteen sample sites. After critical morphological observation (Colony colour, Colony shape, pigmentation, pattern of growth in five days) and microscopic observation, many of the fungal cultures were found to be similar and found to be present at multiple locations and indicated by different superscripts. Identified fungal strains are, Aspergillusfumigatus,Aspergillusglaucaus, Aspergillusnidulans, Fusarium sp., Aspergillusniger. The results show that the region Ludhiana is flourished with microbial flora. The above results also confirm the isolation studies earlier done by Goyalet al 2008, Jain et al 2005. The effect of pH on the growth of AspergillusglaucausandAspergillusfumigatusshowed maximum growth at pH-9 (alkaline pH). The colony diameter was measured i.e 11.5mm. The growth increases after 48hrs. Sporulation was observed after 96hrs. Aspergillusflavus shows that the optimum pH was recorded i.e acidic pH-6. The colony diameter was measured 12.5 after 96 hrs. Green colored spores was observed microscopically after 48 hrs. Similar results were observed with the fungal strains. The optimum pH was 6 & the colony diameter measured i.e 12.5. Sporulation was observed after 96 hrs. The data presented in Table 1 & 2 indicates that Aspergillusfumigatus grows maximally at 25ºC at alkaline pH i.e 8. The colony diameter was measured after the gap of 24 hrs. The maximum colony diameter recorded 30 mm after 96 hrs at 25ºC. The mesophilic fungal strain, Aspergillusfumigatus which grows at 25ºC at acidic pH (i.e 6). The growth rate decreases when temperature increases up to 45ºC. It clearly depicts that the optimum temperature was found to be 25ºC  at pH 8 for the growth of Fusarium sp. The highest colony diameter was measured i.e 40 mm after 96 hrs. the presence of mesophilic fungal strain of Aspergillusnidulans. The fungal sample were allowed to grow at its optimum pH (i.e 6). The optimum temperature found to be recorded was 25ºC and highest colony diameter was 24 mm. The strain of Aspergillusflavus&Aspergillusniger. The optimum temperature was found to be 25ºC at acidic pH (i.e 6). Very less growth was observed after increasing temperature up to 45ºC.

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