no asymmetric expression of CsIAA1 in the roots grown under 1G conditions were detected.
These results revealed that roots become very sensitive to moisture gradients in microgravity
and that auxin redistribution and differential auxin response take place during hydrotropic
response. Also, the results imply that the hydrotropic response can be used as a means of root
growth regulation for plant production in space.
PUBLICATION(S)
Moriwaki T, Miyazawa Y, Kobayashi A, Takahashi H. Molecular mechanisms of hydrotropism in
seedling roots of Arabidopsis thaliana (Brassicaceae). American Journal of Botany.
2013;100(1):25-34. doi: 10.3732/ajb.1200419.
Miyazawa Y, Moriwaki T, Uchida M, Kobayashi A, Fujii N, Takahashi H. Overexpression of MIZU-
KUSSEI1 enhances the root hydrotropic response by retaining cell viability under
hydrostimulated conditions in Arabidopsis thaliana. Plant and Cell Physiology. September 25,
2012;53(11):1926-1933. doi: 10.1093/pcp/pcs129.
Moriwaki T, Miyazawa Y, Fujii N, Takahashi H. Light and abscisic acid signaling are integrated by
MIZ1 gene expression and regulate hydrotropic response in roots of Arabidopsis thaliana. Plant,
Cell and Environment. August 2012;35(8):1359-1368. doi: 10.1111/j.1365-3040.2012.02493.x.
Nakayama M, Kaneko Y, Miyazawa Y, et al. A possible involvement of autophagy in amyloplast
degradation in columella cells during hydrotropic response of Arabidopsis roots. Planta. April
25, 2012;236(4):999-1012. doi: 10.1007/s00425-012-1655-5.
Watanabe C, Fujii N, Yanai K, et al. Gravistimulation changes the accumulation pattern of the
CsPIN1 auxin efflux facilitator in the endodermis of the transition zone in cucumber seedlings.
Plant Physiology. January 2012;158(1):239-251. doi: 10.1104/pp.111.188615.
Yamazaki T, Miyazawa Y, Kobayashi A, Moriwaki T, Fujii N, Takahashi H. MIZ1, an essential
protein for root hydrotropism, is associated with the cytoplasmic face of the endoplasmic
reticulum membrane in Arabidopsis root cells. FEBS Letters. February 2012;586(4):398-402. doi:
10.1016/j.febslet.2012.01.008.
This investigation is complete; however additional results are pending publication.