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Media Comparison for Enumeration of Actinobacteria and their Catabolic Diversity in the Crop Rhizosphere of Arid, Semi-Arid and Humid Regions (AER 3 and AER 6) of India

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Title Media Comparison for Enumeration of Actinobacteria and their Catabolic Diversity in the Crop Rhizosphere of Arid, Semi-Arid and Humid Regions (AER 3 and AER 6) of India
 
Creator T.K. Radha
D.L.N. Rao
K.R. Sreeramulu
 
Subject Actinobacteria, Humic acid vitamin agar, Carbohydrates, Catabolic diversity, Arid and semi-arid soils
 
Description Not Available
Rhizosphere soils of sorghum, pearl millet, pigeon pea, finger millet and groundnut from
sub-tropical arid and semi-arid regions (Karnataka, Andhra Pradesh and Rajasthan) and
from humid pristine forest soils of Karnataka were used to enumerate actinobacterial
populations and their catabolic diversity. The pH of the soils ranged from 5.7 to 9.1 and
organic carbon content from 0.075 to 4.3%. Of five different cultural media used, Humic
acid vitamin agar was found to be superior for enumeration of Actinobacteria. Forty one
(41) Actinobacterial isolates were characterised for morphological and biochemical
attributes and tentatively assigned to four genera - Streptomyces (26 no.), Nocardia (12),
Micromonospora (1) and Saccharopolyspora (2). The catabolic diversity of
Actinobacterial isolates (21 carbon compounds) showed that Shannon-Weaver diversity
index (H) was high (3.54). Dendrogram of Actinobacterial isolates showed some degree of
catabolic relatedness among arid and semi-arid zone isolates. All the isolates had 18%
similarity. At 66% level of similarity there were 18 clusters and this diversity in carbon
utilization was much more in the alkaline arid and semi-arid soils (2.81) than in the acidic
humid soils (1.94). The species evenness in humid zone isolates (1.00) was slightly higher
to that of arid and semi-arid zone (0.993) isolates. The results show that arid and semi-arid
regions represent extremely rich reservoir for the isolation of a significant diversity of
Actinobacteria and that Humic acid- Vitamin agar is best for recovering greater numbers
and diversity.
Not Available
 
Date 2019-10-19T09:42:45Z
2019-10-19T09:42:45Z
2017-10-10
 
Type Article
 
Identifier Not Available
319-7706
http://krishi.icar.gov.in/jspui/handle/123456789/23658
 
Language English
 
Relation Not Available;
 
Publisher Not Available