Plants in Space: Novel Physiological Challenges and Adaptation Mechanisms

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Progress in Botany Vol. 83

Part of the book series: Progress in Botany ((BOTANY,volume 83))

Abstract

Any space exploration initiative, such as the human presence in the Moon and Mars, must incorporate plants for life support. To enable space plant culture we need to understand how plants respond to extraterrestrial conditions, adapt to them, and compensate their deleterious effects at multiple levels. Gravity is a major difference between the terrestrial and the extraterrestrial environment. Gravitropism is the process of establishing a growth direction for plant organs according to the gravity vector. Gravity signals are sensed at specialized tissues by the motion of amyloplasts called statoliths and transduced to produce a cellular polarization capable of influencing the transport of auxin. Gravity alterations eventually result in changes in the lateral balance of auxin in the root, producing deviations of the growth direction. Under microgravity, auxin changes affect the root meristem causing increased cell proliferation and decreased cell growth. The nucleolus, the nuclear site of production of ribosomes, is a marker of this unbalance, which could alter plant development. At the molecular level, microgravity induces a reprogramming of gene expression that mostly affects plant defense systems against abiotic stresses, indicating that these categories of genes are involved in the adaptation to extraterrestrial habitats. Nevertheless, no specific genes for plant response to gravitational stress have been identified. Despite this stress, plants survive, develo** until the adult stage and reproducing under microgravity conditions. A major research challenge is to identify environmental factors, such as light, which could interact, modulate, or balance the impact of gravity, contributing to the tolerance and survival of plants under spaceflight conditions. Understanding the crosstalk between light and gravity sensing will contribute to the success of the next generation agriculture in human settlements outside the Earth.

Communicated by Maria-Carmen Risueño

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Acknowledgements

We wish to thank all those colleagues in many laboratories all over the world, especially in Europe and the USA, with whom we have interacted, collaborated in shared experiments and exchanged data, results, and ideas. Among all of them, we would like to mention Prof. John Z. Kiss (University of North Carolina at Greensboro, USA) and Dr. Ing. Jack van Loon (ESA-ESTEC and Free University of Amsterdam, The Netherlands). We would also like to express our gratitude to technicians, engineers, and management personnel who has decisively contributed to the success of our spaceflight and ground-based experiments and to astronauts of the different ISS crews who took care of and effectively performed the spaceflight operations. Work performed in the authors’ laboratory was supported by different grants of the Spanish National Agency for Research of the Spanish Government, e.g. Grants #ESP2015-64323-R and #RTI2018-099309-B-I00 (co-funded by EU-ERDF). Access to ISS was made possible by ESA and NASA, and the use of ground-based facilities for microgravity simulation was supported by the ESA-CORA-GBF Program.

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Correspondence to F. Javier Medina .

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Medina, F.J., Manzano, A., Kamal, K.Y., Ciska, M., Herranz, R. (2021). Plants in Space: Novel Physiological Challenges and Adaptation Mechanisms. In: Lüttge, U., Cánovas, F.M., Risueño, MC., Leuschner, C., Pretzsch, H. (eds) Progress in Botany Vol. 83. Progress in Botany, vol 83. Springer, Cham. https://doi.org/10.1007/124_2021_53

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