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Experiment/Payload Overview

Information provided courtesy of the Japan Aerospace and Exploration Agency (JAXA).
Brief Summary

Hydrotropism and Auxin-Inducible Gene expression in Roots Grown Under Microgravity Conditions (HydroTropi) determines whether hydrotropic response can be used for the control of cucumber, Cucumis sativus root growth orientation in microgravity.

Principal Investigator

Hideyuki Takahashi, Ph.D., Tohoku University, Sendai, , Japan

Co-Investigator(s)/Collaborator(s)

Nobuharu Fujii, Ph.D., Tohoku University, Sendai, , Japan

Yutaka Miyazawa, Ph.D., Tohoku University, Sendai, , Japan

Payload Developer Information Pending

Sponsoring Space Agency

Japan Aerospace Exploration Agency (JAXA)

Sponsoring Organization:

Information Pending

ISS Expedition Duration:

March 2010 - March 2011

Expeditions Assigned

23/24, 25/26

Previous ISS Missions

Increment 23/24 will be the first mission for HydroTropi operations.

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Experiment/Payload Description

Research Summary

The Hydrotropism and Auxin?Inducible Gene expression in Roots Grown Under Microgravity Conditions (HydroTropi) experiment has three specific aims:

• First, it demonstrates that gravitropism (a plant's ability to change its direction of growth in response to gravity) interferes with hydrotropism (a directional growth response in which the direction is determined by a stimuli in water concentration).



• Second, it clarifies the differential auxin response that occurs during the respective tropisms (reaction of a plant to a stimulus), by investigating the auxin (compound regulating the growth of plants) inducible gene expression.



• Third, it shows whether hydrotropism can be used in controlling root growth orientation in microgravity.

Description

Hydrotropism and Auxin?Inducible Gene expression in Roots Grown Under Microgravity Conditions (HydroTropi) will propose to use the microgravity environment in space to separate hydrotropism from gravitropism and to dissect respective mechanisms in cucumber roots.

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Applications

Space Applications

Information Pending

Earth Applications

HydroTropi provides a further understanding of how plants grow and develop at a molecular level, which can lead to significant advancements in agricultural production on Earth.

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Operations

Operational Requirements

Information Pending

Operational Protocols

Information Pending

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Results/More Information

Information Pending

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Related Web Sites

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Publications

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Ground Based Results Publications

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ISS Patent Publications

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Related Publications

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Images

Cucumber roots grew laterally in space following 70 hours in microgravity on STS-95. Image courtesy of JAXA.

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NASA Image: ISS025E007780 - NASA astronaut Shannon Walker, Expedition 25 flight engineer, works with the Japan Aerospace Exploration Agency (JAXA) experiment HydroTropi (Hydrotropism & Auxin-Inducible Gene Expression in Roots Grown under Microgravity Conditions) in the Kibo laboratory of the International Space Station.

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