Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition
Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive...
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| Format: | Online |
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Hindawi Publishing Corporation
2013
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836376/ |
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pubmed-38363762013-12-08 Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition Geetha, S. J. Joshi, Sanket J. Review Article Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive survival of the inoculated strain may be improved by employing strain selection and by genetic engineering of superior nitrogen fixing strains. Iron sufficiency is an important factor determining the survival and nodulation by rhizobia in soil. Siderophores, a class of ferric specific ligands that are involved in receptor specific iron transport into bacteria, constitute an important part of iron acquisition systems in rhizobia and have been shown to play a role in symbiosis as well as in saprophytic survival. Soils predominantly have iron bound to hydroxamate siderophores, a pool that is largely unavailable to catecholate-utilizing rhizobia. Outer membrane receptors for uptake of ferric hydroxamates include FhuA and FegA which are specific for ferrichrome siderophore. Increase in nodule occupancy and enhanced plant growth of the fegA and fhuA expressing engineered bioinoculants rhizobial strain have been reported. Engineering rhizobia for developing effective bioinoculants with improved ability to utilize heterologous siderophores could provide them with better iron acquisition ability and consequently, rhizospheric stability. Hindawi Publishing Corporation 2013-11-06 /pmc/articles/PMC3836376/ /pubmed/24319357 http://dx.doi.org/10.1155/2013/315890 Text en Copyright © 2013 S. J. Geetha and S. J. Joshi. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Geetha, S. J. Joshi, Sanket J. |
| spellingShingle |
Geetha, S. J. Joshi, Sanket J. Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| author_facet |
Geetha, S. J. Joshi, Sanket J. |
| author_sort |
Geetha, S. J. |
| title |
Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| title_short |
Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| title_full |
Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| title_fullStr |
Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| title_full_unstemmed |
Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition |
| title_sort |
engineering rhizobial bioinoculants: a strategy to improve iron nutrition |
| description |
Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive survival of the inoculated strain may be improved by employing strain selection and by genetic engineering of superior nitrogen fixing strains. Iron sufficiency is an important factor determining the survival and nodulation by rhizobia in soil. Siderophores, a class of ferric specific ligands that are involved in receptor specific iron transport into bacteria, constitute an important part of iron acquisition systems in rhizobia and have been shown to play a role in symbiosis as well as in saprophytic survival. Soils predominantly have iron bound to hydroxamate siderophores, a pool that is largely unavailable to catecholate-utilizing rhizobia. Outer membrane receptors for uptake of ferric hydroxamates include FhuA and FegA which are specific for ferrichrome siderophore. Increase in nodule occupancy and enhanced plant growth of the fegA and fhuA expressing engineered bioinoculants rhizobial strain have been reported. Engineering rhizobia for developing effective bioinoculants with improved ability to utilize heterologous siderophores could provide them with better iron acquisition ability and consequently, rhizospheric stability. |
| publisher |
Hindawi Publishing Corporation |
| publishDate |
2013 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836376/ |
| _version_ |
1612029628096970752 |