Diversity and plant
growth-promoting potential of actinomycetes associated with the rhizosphere
of Arnebia euchroma from Himachal Pradesh (India)
P. Sharma1, A. Rana1, J. Pal2 and A. Kumari3
Basic Sciences, College of Forestry, Dr. YSP University of Horticulture &
Forestry, Solan-173 230, India
Plant Pathology, College of Horticulture, Dr. YSP University of Horticulture
& Forestry, Solan-173 230, India
3Department of Tree
Improvement and Genetic Resources, College of Forestry, Dr. YSP University of
Horticulture & Forestry, Solan-173 230, India
*Corresponding Author Email : firstname.lastname@example.org
The present study aimed to explicate the diversity and plant growth promoting
(PGP) potential of actinomycetes present in the rhizosphere of an endangered
medicinal plant, Arnebia euchroma.
Methodology: Rhizospheric soil samples of A. euchroma
collected from trans-Himalayan region of Himachal Pradesh were processed for
elucidating actinomycetes diversity and load by employing Standard Plate
Count Technique. All recovered isolates were screened for their PGP potential
using standard protocols. The potential strains were identified through
16SrRNA ribotyping and were deposited in the National Culture Collection
Centre, NCMR, Pune, (India).
The rhizosphere of A. euchroma harboured a great deal of actinomycetes
diversity (33 diverse morphotypes). Starch casein agar was best for isolating
the actinomycetes. The same actinomycete isolate showed variations in their
morphological features including pigments production on different isolation
media. They exhibited multifarious plant growth-promoting activities like P-
solubilization, phytase activity, N- fixation, siderophore production etc.
The potential isolates were identified as Streptomyces silaceus CA7
(MK836019) and Streptomyces rectiviolaceus NA8 (MK836018).
Interpretation: The actinomycetes evinced a considerable
plant growth promoting potential that might be helpful in the adaptation and
perpetuation of A. euchroma under prevailing harsh environmental
conditions of Himachal Pradesh.
Key words: Actinomycetes, Arnebia euchroma, Medicinal
plant, PGP, Rhizosphere
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