|Number of samples:||36|
|Release date:||Jun 14 2017|
|Last update date:||Sep 20 2018|
|Dataset link||Genetic Dissection of the Spaceflight Transcriptome Responses in Plants: are some responses unnecessary?|
CARA Seed Lines and Planting: Three seed lines Wild-Type Wassilewskija (Ws), Columbia-0 (Col-0) and Col-0 PhyD (phyD) Mutants were tested for viability, sterility and ability to maintain dormancy before the launch. Tested batches of seeds were planted on phytagel plates as one genotype per plate for gene expression analysis in replicates of three. One set was planted for the flight and one for ground control. The plates were wrapped such that every surface of the plate was covered by two layers of Duvetyn Black-Out cloth (Seattle Fabrics) (Sng et al, 2014). The plates were stored 4° C until launch, and was then launched in a cold-stow bag to maintain the plates at 4° C until integration and activation on the ISS. On Orbit Operations and harvest: The dormant plates were activated on station by removing the Black-Out cloth wrapping 12 days after launch. The plates were then placed on a fabric that was mounted in the US Laboratory module on the wall adjoining the MELFI freezer and secured using Velcro. The plants were allowed to grow on orbit for 11 days; some in the ambient light of ISS and some in the dark. The dark-grown plates were first activated by exposing the seeds to light for 4 hours, and then re-wrapped in Black-Out cloth for the duration of the growth period. A corresponding set of seedlings were grown as ground control in KSC. At 11 days, seedlings were photographed, harvested into KFT containing RNAlater solutions and returned for post-flight analysis. All plates were harvested into KFTs with their counterpart (e.g. Light 1 was harvested with Dark 1). Once the plants were placed in the KFTs, the KFT was actuated with RNAlater to preserve the sample. At 24 hours post-harvest, KFTs were then transferred to MELFI, the -32°C freezer. Following SpaceX-3 splashdown in the Pacific Ocean, the KFTs transferred to the Cold Stowage charter plane at the Long Beach Airport, placed into an insulated shipper with dry ice, and flown to Johnson Space Center (JSC). The KFTs were then transferred via FedEx ground to the Kennedy Space Center. The KFTs were removed from dry ice and transferred to a -80°C freezer on May 22, 2014. The PIs retrieved the plant samples from the KFTs on May 29, 2014 and transferred the samples back to the University of Florida. The harvested material was used to compare the transcriptomes of each genotype. The patterns of gene expression was compared among genotypes within a treatment (spaceflight or unit gravity) and between treatments (spaceflight versus ground control) for each genotype.
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