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Growth in microgravity increases susceptibility of soybean to a fungal pathogenThe influence of microgravity on the susceptibility of soybean roots to Phytophthora sojae was studied during the Space Shuttle Mission STS-87. Seedlings of soybean cultivar Williams 82 grown in spaceflight or at unit gravity were untreated or inoculated with the soybean root rot pathogen P. sojae. At 3, 6 and 7 d after launch while still in microgravity, seedlings were photographed and then fixed for subsequent microscopic analysis. Post-landing analysis of the seedlings revealed that at harvest day 7 the length of untreated roots did not differ between flight and ground samples. However, the flight-grown roots infected with P. sojae showed more disease symptoms (percentage of brown and macerated areas) and the root tissues were more extensively colonized relative to the ground controls exposed to the fungus. Ethylene levels were higher in spaceflight when compared to ground samples. These data suggest that soybean seedlings grown in microgravity are more susceptible to colonization by a fungal pathogen relative to ground controls.
Document ID
20040112387
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ryba-White, M.
(Kansas State University Manhattan, KS 66506-5502, U.S.A)
Nedukha, O.
Hilaire, E.
Guikema, J. A.
Kordyum, E.
Leach, J. E.
Spooner, B. S.
Date Acquired
August 21, 2013
Publication Date
June 1, 2001
Publication Information
Publication: Plant & cell physiology
Volume: 42
Issue: 6
ISSN: 0032-0781
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
manned
NASA Discipline Plant Biology
short duration
Flight Experiment
NASA Experiment Number 9600003
Non-NASA Center
STS-87 Shuttle Project

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