I find over 100 articles returned by a PubMed query for "Arabidopsis microgravity." Arabidopsis was taken aboard at least one if not more Space Shuttle missions to answer this and other similar questions. A couple recent papers from this search are:
Spaceflight transcriptomes: unique responses to a novel environment.
Paul AL, Zupanska AK, Ostrow DT, Zhang Y, Sun Y, Li JL, Shanker S, Farmerie WG, Amalfitano CE, Ferl RJ.
Astrobiology. 2012 Jan;12(1):40-56.
PMID: 22221117
An endogenous growth pattern of roots is revealed in seedlings grown in microgravity.
Millar KD, Johnson CM, Edelmann RE, Kiss JZ.
Astrobiology. 2011 Oct;11(8):787-97. doi: 10.1089/ast.2011.0699.
PMID: 21970704
Parabolic flight induces changes in gene expression patterns in Arabidopsis thaliana.
Paul AL, Manak MS, Mayfield JD, Reyes MF, Gurley WB, Ferl RJ.
Astrobiology. 2011 Oct;11(8):743-58. doi: 10.1089/ast.2011.0659.
PMID: 21970703
Gene expression changes in Arabidopsis seedlings during short- to long-term exposure to 3-D clinorotation.
Soh H, Auh C, Soh WY, Han K, Kim D, Lee S, Rhee Y.
Planta. 2011 Aug;234(2):255-70.
PMID: 21416242
A novel phototropic response to red light is revealed in microgravity.
Millar KD, Kumar P, Correll MJ, Mullen JL, Hangarter RP, Edelmann RE, Kiss JZ.
New Phytol. 2010 May;186(3):648-56.
PMID: 20298479
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