Table 3 Phenotypic characteristics of selected actinobacteria from A & N Islands

Morphological characteristics

Spore morphology

Long elongated

Coccoid

Short

Finger shaped

Colour of aerial mycelium

Pale yellow

Dull brown

Creamy white

Greenish black

Colour of substrate mycelium

Brown

Brown

Brown

-

Soluble pigment

Greenish brown

Brown

-

-

Spore mass

Pale yellow

Dull brown

Creamy white

Greenish black

Biochemical characteristics

Gram staining

+

+

+

+

Indole production

-

-

+

-

Methyl Red

+

+

-

-

Voges Proskauer

+

-

-

-

Citrate utilization

+

-

+

-

H₂S production

+

+

-

+

Nitrate reduction

+

-

-

+

Urease

-

+

+

+

Catalase

+

+

+

+

Oxidase

+

+

+

+

Melanin production

+

+

+

-

Starch hydrolysis

+

+

+

-

Haemolysis

+

+

+

-

Triple sugar iron

-

alk/alk

alk/alk

-

Survival at 50°C

Excellent

Excellent

-

-

Carbon source utilization

Starch

+

+

+

-

Dextrose

+

+

+

+

Fructose

-

+

+

-

Maltose

+

+

-

+

Mannitol

-

+

-

+

pH

5

-

-

-

+

6

+

+

+

+

7

+

+

+

+

8

+

+

+

+

9

+

+

+

+

10

+

+

+

+

11

+

+

+

+

NaCl tolerence (%)

5

+

+

+

+

10

+

+

+

+

15

+

+

+

+

20

+

+

+

+

25

-

+

-

+

30

-

+

-

+