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Abou Jaoudé R, Luziatelli F, Ficca AG, Ruzzi M. A plant's perception of growth-promoting bacteria and their metabolites. FRONTIERS IN PLANT SCIENCE 2024; 14:1332864. [PMID: 38328622 PMCID: PMC10848262 DOI: 10.3389/fpls.2023.1332864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 12/28/2023] [Indexed: 02/09/2024]
Abstract
Many recent studies have highlighted the importance of plant growth-promoting (rhizo)bacteria (PGPR) in supporting plant's development, particularly under biotic and abiotic stress. Most focus on the plant growth-promoting traits of selected strains and the latter's effect on plant biomass, root architecture, leaf area, and specific metabolite accumulation. Regarding energy balance, plant growth is the outcome of an input (photosynthesis) and several outputs (i.e., respiration, exudation, shedding, and herbivory), frequently neglected in classical studies on PGPR-plant interaction. Here, we discuss the primary evidence underlying the modifications triggered by PGPR and their metabolites on the plant ecophysiology. We propose to detect PGPR-induced variations in the photosynthetic activity using leaf gas exchange and recommend setting up the correct timing for monitoring plant responses according to the specific objectives of the experiment. This research identifies the challenges and tries to provide future directions to scientists working on PGPR-plant interactions to exploit the potential of microorganisms' application in improving plant value.
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Affiliation(s)
- Renée Abou Jaoudé
- Department for Innovation in Biological, Agrofood and Forest Systems (DIBAF), University of Tuscia, Viterbo, Italy
| | | | | | - Maurizio Ruzzi
- Department for Innovation in Biological, Agrofood and Forest Systems (DIBAF), University of Tuscia, Viterbo, Italy
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Zhao X, Yuan X, Xing Y, Dao J, Zhao D, Li Y, Li W, Wang Z. A meta-analysis on morphological, physiological and biochemical responses of plants with PGPR inoculation under drought stress. PLANT, CELL & ENVIRONMENT 2023; 46:199-214. [PMID: 36251623 DOI: 10.1111/pce.14466] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 09/30/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Plant growth-promoting rhizobacteria (PGPR) can help plants to resist drought stress. However, the mechanisms of how PGPR inoculation affect plant status under drought remain incompletely understood. We performed a meta-analysis of plant response to PGPR inoculation by compiling data from 57 PGPR-inoculation studies, including 2, 387 paired observations on morphological, physiological and biochemical parameters under drought and well-watered conditions. We compare the PGPR effect on plants performances among different groups of controls and treatments. Our results reveal that PGPR enables plants to restore themselves from drought-stressed to near a well-watered state, and that C4 plants recover better from drought stress than C3 plants. Furthermore, PGPR is more effective underdrought than well-watered conditions in increasing plant biomass, enhancing photosynthesis and inhibiting oxidant damage, and the responses of C4 plants to the PGPR effect was stronger than that of C3 plants under drought conditions. Additionally, PGPR belonging to different taxa and PGPR with different functional traits have varying degrees of drought-resistance effects on plants. These results are important to improve our understanding of the PGPR beneficial effects on enhanced drought-resistance of plants.
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Affiliation(s)
- Xiaowen Zhao
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, Guangxi, PR China
- State Key Laboratory for Conservation & Utilisation of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Nanjing Agricultural University, Nanjing, PR China
| | - Xiaomai Yuan
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, Guangxi, PR China
- State Key Laboratory for Conservation & Utilisation of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Guangxi University, Nanning, Guangxi, PR China
| | - Yuanjun Xing
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, Guangxi, PR China
- State Key Laboratory for Conservation & Utilisation of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Guangxi University, Nanning, Guangxi, PR China
| | - Jicao Dao
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, Guangxi, PR China
- State Key Laboratory for Conservation & Utilisation of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Guangxi University, Nanning, Guangxi, PR China
| | - Deqiang Zhao
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, PR China
| | - Yuze Li
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, PR China
| | - Weiwei Li
- College of Agronomy, Nanjing Agricultural University, Nanjing, PR China
| | - Ziting Wang
- Guangxi Key Laboratory of Sugarcane Biology, Nanning, Guangxi, PR China
- State Key Laboratory for Conservation & Utilisation of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, PR China
- College of Agronomy, Guangxi University, Nanning, Guangxi, PR China
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Tyagi R, Pradhan S, Bhattacharjee A, Dubey S, Sharma S. Management of abiotic stresses by microbiome-based engineering of the rhizosphere. J Appl Microbiol 2022; 133:254-272. [PMID: 35352450 DOI: 10.1111/jam.15552] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 02/27/2022] [Accepted: 03/22/2022] [Indexed: 11/30/2022]
Abstract
Abiotic stresses detrimentally affect both plant and soil health, threatening food security in an ever-increasing world population. Sustainable agriculture is necessary to augment crop yield with simultaneous management of stresses. Limitations of conventional bioinoculants has shifted the focus on more effective alternatives. With the realisation of the potential of rhizospheric microbiome engineering in enhancing plant's fitness under stresses, efforts have accelerated in this direction. Though still in its infancy, microbiome-based engineering has gained popularity because of its advantages over microbe-based approach. This review briefly presents major abiotic stresses afflicting arable land, followed by introduction to the conventional approach of microbe-based enhancement of plant attributes and stress mitigation with its inherent limitations. It then focusses on the significance of rhizospheric microbiome, and harnessing its potential by its strategic engineering for stress management. Further, success stories related to two major approaches of microbiome engineering (generation of synthetic microbial community/consortium, and host-mediated artificial selection) pertaining to stress management have been critically presented. Together with bringing forth the challenges associated with wide application of rhizospheric microbiome engineering in agriculture, the review proposes the adoption of combinatorial scheme for the same, bringing together ecological and reductionist approaches for improvised sustainable agricultural practices.
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Affiliation(s)
- Rashi Tyagi
- Department of Biochemical Engineering and, Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi
| | - Salila Pradhan
- Department of Biochemical Engineering and, Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi
| | - Annapurna Bhattacharjee
- Department of Biochemical Engineering and, Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi
| | - Shubham Dubey
- Department of Biochemical Engineering and, Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi
| | - Shilpi Sharma
- Department of Biochemical Engineering and, Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi
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