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Hirsch AM, Khan N, Humm E, Rubbi M, Del Vecchio G, Ha SM, Pellegrini M, Gunsalus RP. Genome of Dietzia cinnamea 55, a desert-isolated microbe with plant growth-promoting properties for grain crops. Microbiol Resour Announc 2024:e0025724. [PMID: 39254331 DOI: 10.1128/mra.00257-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 07/30/2024] [Indexed: 09/11/2024] Open
Abstract
Here, we report the genome sequence of Dietzia cinnamea 55, isolated from the Negev Desert, Israel. D. cinnamea 55 was found to promote the growth of several cereal crops (corn, wheat, and pearl millet) in greenhouse and field studies.
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Affiliation(s)
- Ann M Hirsch
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California, USA
| | - Noor Khan
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California, USA
| | - Ethan Humm
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California, USA
| | - Mila Rubbi
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California, USA
| | - Giorgia Del Vecchio
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California, USA
| | - Sung Min Ha
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California, USA
| | - Matteo Pellegrini
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California, USA
- UCLA DOE Institute, University of California, Los Angeles, California, USA
| | - Robert P Gunsalus
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California, USA
- UCLA DOE Institute, University of California, Los Angeles, California, USA
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Khan N, Humm EA, Jayakarunakaran A, Hirsch AM. Reviewing and renewing the use of beneficial root and soil bacteria for plant growth and sustainability in nutrient-poor, arid soils. FRONTIERS IN PLANT SCIENCE 2023; 14:1147535. [PMID: 37089637 PMCID: PMC10117987 DOI: 10.3389/fpls.2023.1147535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 03/16/2023] [Indexed: 05/03/2023]
Abstract
A rapidly increasing human population coupled with climate change and several decades of over-reliance on synthetic fertilizers has led to two pressing global challenges: food insecurity and land degradation. Therefore, it is crucial that practices enabling both soil and plant health as well as sustainability be even more actively pursued. Sustainability and soil fertility encompass practices such as improving plant productivity in poor and arid soils, maintaining soil health, and minimizing harmful impacts on ecosystems brought about by poor soil management, including run-off of agricultural chemicals and other contaminants into waterways. Plant growth promoting bacteria (PGPB) can improve food production in numerous ways: by facilitating resource acquisition of macro- and micronutrients (especially N and P), modulating phytohormone levels, antagonizing pathogenic agents and maintaining soil fertility. The PGPB comprise different functional and taxonomic groups of bacteria belonging to multiple phyla, including Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria, among others. This review summarizes many of the mechanisms and methods these beneficial soil bacteria use to promote plant health and asks whether they can be further developed into effective, potentially commercially available plant stimulants that substantially reduce or replace various harmful practices involved in food production and ecosystem stability. Our goal is to describe the various mechanisms involved in beneficial plant-microbe interactions and how they can help us attain sustainability.
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Affiliation(s)
- Noor Khan
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Ethan A. Humm
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Akshaya Jayakarunakaran
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Ann M. Hirsch
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States
- Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, United States
- *Correspondence: Ann M. Hirsch,
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Srinivasan J, Khadka J, Novoplansky N, Gillor O, Grafi G. Endophytic Bacteria Colonizing the Petiole of the Desert Plant Zygophyllum dumosum Boiss: Possible Role in Mitigating Stress. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11040484. [PMID: 35214818 PMCID: PMC8924888 DOI: 10.3390/plants11040484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/03/2022] [Accepted: 02/09/2022] [Indexed: 05/13/2023]
Abstract
Zygophyllum dumosum is a dominant shrub in the Negev Desert whose survival is accomplished by multiple mechanisms including abscission of leaflets to reduce whole plant transpiration while leaving the fleshy, wax-covered petioles alive but dormant during the dry season. Petioles that can survive for two full growing seasons maintain cell component integrity and resume metabolic activity at the beginning of the winter. This remarkable survival prompted us to investigate endophytic bacteria colonizing the internal tissues of the petiole and assess their role in stress tolerance. Twenty-one distinct endophytes were isolated by culturing from surface-sterile petioles and identified by sequencing of the 16S rDNA. Sequence alignments and the phylogenetic tree clustered the isolated endophytes into two phyla, Firmicutes and Actinobacteria. Most isolated endophytes displayed a relatively slow growth on nutrient agar, which was accelerated by adding petiole extracts. Metabolic analysis of selected endophytes showed several common metabolites whose level is affected by petiole extract in a species-dependent manner including phosphoric acid, pyroglutamic acid, and glutamic acid. Other metabolites appear to be endophyte-specific metabolites, such as proline and trehalose, which were implicated in stress tolerance. These results demonstrate the existence of multiple endophytic bacteria colonizing Z. dumosum petioles with the potential role in maintaining cell integrity and functionality via synthesis of multiple beneficial metabolites that mitigate stress and contribute to stress tolerance.
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Affiliation(s)
- Jansirani Srinivasan
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel;
| | - Janardan Khadka
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
| | - Nurit Novoplansky
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
| | - Osnat Gillor
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel;
| | - Gideon Grafi
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel; (J.S.); (J.K.); (N.N.)
- Correspondence:
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