PRODUCTION OF PLANT GROWTH PROMOTING INDOLE ACETIC ACID BY AZOTOBACTER FROM SALINE BELT OF VIDARBHA REGION

RUPALI  R. DESHMUKH; N. N. VIDHALE

Volume : V, Issue : V, May - 2015

PRODUCTION OF PLANT GROWTH PROMOTING INDOLE ACETIC ACID BY AZOTOBACTER FROM SALINE BELT OF VIDARBHA REGION

Rupali R. Deshmukh, N. N. Vidhale

Abstract :

The alluvial vally of Purna river and its tributaries occupy parts of Amravati, Akola and Buldhana districts of Maharashtra State. The Purna alluvial deposits cover an area of 6200 sq.km of which 3000 sq.km is characterized by saline soil possessing pH range 7.5 to 9.5. Nearly 45 isolates of Azotobacter were isolated and identified from saline soil of different villages belonging to four Tahasils of Buldhana district of state Maharashtra. These isolates were identified on the basis of Morphology, Biochemical and Cultural characteristics and were studied for production of plant growth promoting hormone IAA, which was detected by TLC method and estimated by colorimetry. It has been noted that highest concentration of IAA (40 µg/ml) was produced by Azotobacter beijerinkii followed by 13 to21 µg/ml by Azotobacter chrococcum. These strains of Azotobacter can be the excellent plant growth promoting bacteria in the saline soil of this region, and for growth and better agricultural products.