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Plant responses to hypergravity: a comprehensive review

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Abstract

Main conclusion

Hypergravity is an effective novel stimulus to elucidate plant gravitational and mechanobiological behaviour. Here, we review the current understanding of phenotypic, physio-biochemical, and molecular plant responses to simulated hypergravity.

Abstract

Plants readily respond to altered gravity conditions, such as microgravity or hypergravity. Hypergravity—a gravitational force higher than that on the Earth’s surface (> 1g)—can be simulated using centrifuges. Exposing seeds, seedlings, or plant cell cultures to hypergravity elicits characteristic morphological, physio-biochemical, and molecular changes. While several studies have provided insights into plant responses and underlying mechanisms, much is still elusive, including the interplay of hypergravity with gravitropism. Moreover, hypergravity is of great significance for mechano- and space/gravitational biologists to elucidate fundamental plant behaviour. In this review, we provide an overview of the phenotypic, physiological, biochemical, and molecular responses of plants to hypergravity. We then discuss the involvement of hypergravity in plant gravitropism—the directional growth along the gravity vector. Finally, we highlight future research directions to expand our understanding of hypergravity in plant biology.

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Data availability

The datasets generated during and/or analysed during the current study are available in the Zenodo repository at https://doi.org/10.5281/zenodo.7447355.

Abbreviations

ATPA2:

Arabidopsis thaliana Class II peroxidases

CDC:

Cell division control protein

CDK:

Cyclin-dependent kinase

g :

Gravitational acceleration on Earth’s surface (9.81 ms–2)

HMGR:

3-Hydroxy-3-methylglutaryl-coenzyme A reductase

HSP:

Heat shock proteins

MAPs:

Microtubule-associated proteins

MCA:

Mid1-complementing activity channels

MSIC:

Mechanosensitive ion channels

RPA:

Replication protein A

ROS:

Reactive oxygen species

TDH:

Total dehydrogenase

XTH:

Xyloglucan endotransglucosylase/hydrolase

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Acknowledgements

The first author (BKS) acknowledges the DBT-JNU, Govt. of India for the fellowship. The corresponding author Ravikumar Hosamani (RH) acknowledges DST-SERB for awarding a research grant of which this publication is part.

Funding

The study was funded by DST-SERB, Govt. of India (Grant EEQ/2018/000604).

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Correspondence to Ravikumar Hosamani.

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The authors declare no conflict of interest.

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Communicated by Gerhard Leubner.

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Hosamani, R., Swamy, B.K., Dsouza, A. et al. Plant responses to hypergravity: a comprehensive review. Planta 257, 17 (2023). https://doi.org/10.1007/s00425-022-04051-6

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  • DOI: https://doi.org/10.1007/s00425-022-04051-6

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