ISSN: 0973-7510

E-ISSN: 2581-690X

Preeti Saini and Veena Khanna
1Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India.
J Pure Appl Microbiol. 2013;7(1):573-576
© The Author(s). 2013
Received: 10/08/2012 | Accepted: 25/09/2012 | Published: 31/03/2013
Abstract

Ethylene is well thought-out stress hormone because its synthesis is induced by a variety of stresses. Nodulation and subsequent nitrogen fixation by lentil plants are inhibited by accelerated ethylene concentration in the root zone. Some plant-growth-promoting rhizobacteria (PGPR) promote plant growth by lowering the endogenous ethylene synthesis in the roots through their 1-aminocylopropane-1-carboxylate (ACC)-deaminase activity. A total of 9 rhizobacterial isolates obtained from lentil rhizospheric soils were characterized and found belonging to genera Bacillus (6), Pseudomonas (3), which were able to utilize ACC as the sole N-source, their ACC-metabolizing rate measured as optical density (OD496) and (OD600) ranged from 0.54-1.39 and 0.165-1.120 respectively. The isolates also showed compatibility with Rhizobium leguminosarum under axenic conditions and also promoted root/shoot growth in lentil seedlings. Our results reveal that inoculation with PGPR containing ACC-deaminase and Rhizobium could be utilized as expeditious biofertilizers to increase the growth as well as nodulation in legume plants.

Keywords

ACC-deaminase, lentil, PGPR, Rhizobium, legumes, symbiosis, biofertilizer

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