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Bacterial indole-3-acetic acid influences soil nitrogen acquisition in barley and chickpea
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plants-10-00780.pdf | Published version | 6.7 MB | Adobe PDF | View/Open |
Title: | Bacterial indole-3-acetic acid influences soil nitrogen acquisition in barley and chickpea |
Authors: | Gang, S Sharma, S Saraf, M Buck, M Schumacher, J |
Item Type: | Journal Article |
Abstract: | Farming of barley and chickpea is nitrogen (N) fertilizer dependent. Using strategies that increase the nitrogen use efficiency (NUE) and its components, nitrogen uptake efficiency (NUpE) and nitrogen utilization efficiency (NUtE) would reduce the N fertilizer application in the soil and its adverse environmental effects. We evaluated the effects of three different strains of diazotroph Klebsiella (K.p. SSN1, K.q. SGM81, and K.o. M5a1) to understand the role of biological nitrogen fixation (BNF) and bacterial indole-3-acetic acid (IAA) on NUE of the plants. A field study revealed that K.p. SSN1 results in profound increment of root surface area by eightfold and threefold compared to uninoculated (control) in barley and chickpea, respectively. We measured significant increase in the plant tissue nitrogen, chlorophyll content, protein content, nitrate reductase activity, and nitrate concentration in the inoculated plants (p ≤ 0.05). Treated barley and chickpea exhibited higher NUE and the components compared to the control plants (K.p. SSN1 ≥ K.q. SGM81> K.o. M5a1). Specifically, K.q. SGM81 treatment in barley increased NUpE by 72%, while in chickpea, K.p. SSN1 increased it by 187%. The substantial improvement in the NUpE and NUE by the auxin producers K.p. SSN1 and K.q. SGM81 compared with non-auxin producer K.o. M5a1 was accompanied by an augmented root architecture suggesting larger contribution of IAA over marginal contribution of BNF in nitrogen acquisition from the soil. |
Issue Date: | 16-Apr-2021 |
Date of Acceptance: | 23-Mar-2021 |
URI: | http://hdl.handle.net/10044/1/89066 |
DOI: | 10.3390/plants10040780 |
ISSN: | 2223-7747 |
Journal / Book Title: | Plants |
Volume: | 10 |
Issue: | 4 |
Copyright Statement: | © 2021 by the authors.Licensee MDPI, Basel, Switzerland.This article is an open access articledistributed under the terms andconditions of the Creative CommonsAttribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
Keywords: | Science & Technology Life Sciences & Biomedicine Plant Sciences nitrogen use efficiency nitrogen uptake efficiency nitrogen utilization efficiency Klebsiella indole acetic acid root architecture GROWTH-PROMOTING RHIZOBACTERIA USE EFFICIENCY REDUCTASE-ACTIVITY TRITICUM-AESTIVUM NITRATE ROOT AZOSPIRILLUM INOCULATION TRANSPORT FIXATION Klebsiella indole acetic acid nitrogen uptake efficiency nitrogen use efficiency nitrogen utilization efficiency root architecture |
Publication Status: | Published |
Article Number: | ARTN 780 |
Appears in Collections: | Cell and Molecular Biology Faculty of Natural Sciences |
This item is licensed under a Creative Commons License