Home
Print _CMN_EMAIL_ALT
Stress-tolerant antagonistic plant growth-promoting rhizobacteria from Zea mays

 

Amandeep Kaur, Soibam Richan Devi, Pratibha Vyas*

 

Microbiology Department, School of Bioengineering and Biosciences, Lovely Professional University, India

 

Received: November 11, 2017

Accepted: May 7, 2018

*Corresponding address:

This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Abstract

Biological control of plant diseases is strongly emerging as an effective alternative to the use of chemical pesticides and fungicides. Stress tolerance is an important attribute in the selection of bacteria for the development of microbial inoculants. Fourteen salt-tolerant bacteria showing different morphological features isolated from the rhizosphere of maize were evaluated for different plant growth-promoting activities. All isolates showed auxin production ranging from 5 to 24 μg ml–1 after 48 h incubation in tryptophan supplemented media. Phosphate solubilization ranged from 15 to 419 μg ml–1. 1-aminocycloproprane-1-carboxylate (ACC) deaminase activity was shown by 6 isolates, ammonia production by 9 isolates, siderophore production by 8 isolates while HCN production by 4 isolates. Four bacterial isolates with all plant growth-promoting properties also showed strong antagonistic activities against Fusarium oxysporum, F. verticillioides, Curvularia lunata and Alternaria alternata and abiotic stress tolerance against salinity, temperature, pH and calcium salts. Two selected bacterial isolates significantly enhanced the growth of pea and maize test plants under greenhouse conditions. The bacterial isolate M1B2, which showed the highest growth promotion of test plants, was identified as Bacillus sp. based on phenotypic and 16S rDNA gene sequencing. The results indicated that Bacillus sp. M1B2 is a potential candidate for the development of microbial inoculants in stressful environments.

 

Key words: antagonism, Bacillus, maize, phosphate solubilization, plant growth promotion, stress tolerance OR

 
Editor in Chief
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Managing Editors
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Current issue cover
Who's Online
We have 1 guest online