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Plants, plant pathogens, and microgravity--a deadly trio.

J E Leach¹, M Ryba-White, Q Sun

¹Department of Plant Pathology and Division of Biology, Kansas State University, Manhattan, KS 66506-5502, USA. jeleach@ksu.edu

Gravitational and Space Biology Bulletin : Publication of the American Society for Gravitational and Space Biology

|February 28, 2002

Summary

Plants in space are more vulnerable to pathogens due to impaired defense responses. This study uses gene expression analysis to understand these changes and develop strategies for disease management in space.

Keywords:

NASA Discipline Plant Biology NASA Experiment Number 9600003 Non-NASA Center

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Area of Science:

Plant pathology
Space biology
Genomics

Background:

Plants grown in space exhibit increased susceptibility to pathogens.
The mechanisms behind this enhanced susceptibility, potentially involving impaired structural barriers and defense responses, are not fully understood.
Previous research was limited by available tools, focusing on specific pathways rather than global gene expression.

Purpose of the Study:

To investigate the global impact of spaceflight conditions on plant gene expression.
To identify molecular mechanisms underlying altered plant defense responses in space.
To lay the groundwork for managing plant diseases in extraterrestrial environments.

Main Methods:

Utilized microarray technologies to analyze global gene expression profiles.
Developed cDNA subtraction libraries in rice, enriched for pathogen-induced and defense-response genes.
Employed a model system with wild-type rice and lesion mimic mutants for dissecting defense pathways.

Main Results:

Ground-based studies provided gene expression profiles relevant to spaceflight impacts.
Identified potential alterations in gene expression affecting plant structural barriers and defense activation.
Established a foundation for understanding molecular and physiological changes in plants under simulated space conditions.

Conclusions:

Altered gene expression is a likely cause of increased plant pathogen susceptibility in spaceflight.
Understanding these gene expression profiles is crucial for developing countermeasures against plant diseases in space.
This research enables strategies for ensuring plant health and disease management for future space exploration.