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=--=--=START=--=--= NASA Spacelink File Name:6_2_2_46_3_14.TXT
CHROMOSOMES AND PLANT CELL DIVISION IN SPACE
(CHROMEX-4)
Principal investigators:
Dr. Abraham Krikorian, State University of New York at Stony Brook
Dr. Mary Musgrave, Louisiana State University
Dr. Norman Lewis, Washington State University
The upcoming flight of the CHROMEX-4 experiment is the fourth in
a series of Life Sciences middeck experiments dealing with the growth
of plants in microgravity.
The CHROMEX-4 payload consists of three scientific experiments.
They are plant reproduction studies which are a reflight of the
CHROMEX-3 experiment; plant cell developmental studies which carry
the studies of CHROMEX-1 and CHROMEX-2 to another plant species; and
cell wall formation and gene expression studies. The CHROMEX-4
payload also will provide the opportunity to evaluate a new nutrient
support system developed at Washington State University.
The anticipated science benefits may lead to new strategies to
manipulate and exploit the effect of gravity in plant growth,
development, biochemistry and biotechnology. Such understandings
will directly benefit the agriculture, horticulture and forestry
industries which depend upon plant growth for their products.
The plants being studied on CHROMEX-4 are mouse-ear cress
(Arabidopsis thaliana) and a strain of wheat (Triticum aestivum).
Arabidopsis is a small, fast-growing plant widely studied by
plant scientists. It is found in the wild and cultivated for
research. This plant will self pollinate during the 9-day mission
and begin producing seeds. Dr. Musgrave will investigate the effects
of the microgravity environment on seed production and seed forming
structures of the plants.
Triticum is a superdwarf variety of wheat and has been widely
studied among plant researchers. Root and shoot development, cell
wall formation and gene expression studies are being conducted on
these specimens by Drs. Krikorian and Lewis.
These plant specimens and their nutrient support systems are
integrated with the Plant Growth Chambers (PGC) approximately 1 day
before launch. The PCGs are loaded into the Plant Growth Unit (PGU).
The PGU replaces one standard middeck locker and requires 28 volts of
power from the orbiter. This hardware provides lighting, limited
temperature control and data acquisition for post-flight analysis.
The payload crew is required to perform nominal experiment activities
consisting of a daily status check to monitor the PGU's systems'
function.
Following the flight of these plants, the investigators will
perform complete dissections of the entire plant structure and
preserve the tissues by chemical fixation or flash freezing.
The PGU was developed by NASA. The experiment is sponsored by
NASA's Office of Life and Microgravity Sciences and Applications.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=