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Water relations in plants treated with growth promoting rhizosphere bacteria

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A Correction to this article was published on 30 September 2023

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Abstract

Background

Plant growth promoting rhizobacteria (PGPR) often increase leaf area. Since water loss by transpiration is proportional to leaf area, adaptive responses will be required if further growth is not to be compromised by plant water deficits. However, studies of water relations of plants growing in soil enriched with PGPR have yielded conflicting results and an analysis of the causes of this contradiction are needed if PGPR application is to be utilized successfully in practical farming.

Scope

We discuss the effects of PGPR on stomatal conductance, transpiration, leaf relative water content, leaf water potential, root growth and hydraulic conductance. We assess their importance for maintaining water balance and sustaining and promoting plant growth following bacterial inoculation. We also assess the involvement of PGPR on hormone concentrations in planta (primarily abscisic acid, ABA) in regulating these processes.

Conclusions

PGPR exert variable effects on plant water relations. For example, both increased and decreased stomatal conductance and relative water content have been reported. Effectiveness of these alternative responses is discussed in relation to soil water availability. Plant responses to PGPR can be classified in terms of: (1) stimulating root growth thereby increasing capacity for water uptake and compensating for increased transpirational load (2) promoting stomatal closure and reduced transpiration, (3) increased activity of water channels (AQPs) in roots resulting in greater hydraulic conductivity; (4) osmotic adjustment that helps maintain leaf turgor under decreased leaf hydration.;

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Data Availability

The research data associated with this paper is available, in the references cited.

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Abbreviations

ABA:

Abscisic acid

AQPs:

Water channels aquaporins

PGPR:

Plant growth-promoting rhizobacteria

LTPs:

Lipid transport proteins

RWC:

Relative water content

WUE:

Water use efficiency

References

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Acknowledgements

This research was funded by Russian Scientific Foundation (grant number 21-14-00070).

We are grateful to Prof. Ian C. Dodd (Lancaster University, UK) for a pre-submission review of our article and valuable comments.

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Correspondence to Guzel Kudoyarova.

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Responsible Editor: Ian Dodd.

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Highlight

This review summarizes the various ways rhizosphere bacteria can influence plant water relations.

The original online version of this article was revised: Author given names and surnames were interchanged

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Kudoyarova, G., Arkhipova, T. & Veselov, D. Water relations in plants treated with growth promoting rhizosphere bacteria. Plant Soil 494, 51–72 (2024). https://doi.org/10.1007/s11104-023-06270-6

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  • DOI: https://doi.org/10.1007/s11104-023-06270-6

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