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Title

A novel blue-light phototropic response is revealed in roots of Arabidopsis thaliana in microgravity

Other TitlesThe effects of microgravity on phototropism
AuthorsVandenbrink, Joshua P.; Herranz, Raúl ; Medina, F. Javier ; Edelmann, Richard E.; Kiss, John Z.
KeywordsArabidopsis
Fractional Gravity
Microgravity
Phototropism
Reduced Gravity
Spaceflight
Issue Date9-Aug-2016
PublisherSpringer
CitationPlanta. 2016
AbstractDue to their sessile nature, plants utilize environmental cues to grow and respond to their surroundings. Two of these cues, light and gravity, play a substantial role in plant orientation and directed growth movements (tropisms). However, very little is currently known about the interaction between light- (phototropic) and gravity (gravitropic)-mediated growth responses. Utilizing the European Modular Cultivation System on board the International Space Station, we investigated the interaction between phototropic and gravitropic responses in three Arabidopsis thaliana genotypes, Landsberg wild type, as well as mutants of phytochrome A and phytochrome B. Onboard centrifuges were used to create a fractional gravity gradient ranging from reduced gravity up to 1g. A novel positive blue-light phototropic response of roots was observed during conditions of microgravity, and this response was attenuated at 0.1g. In addition, a red-light pretreatment of plants enhanced the magnitude of positive phototropic curvature of roots in response to blue illumination. In addition, a positive phototropic response of roots was observed when exposed to red light, and a decrease in response was gradual and correlated with the increase in gravity. The positive red-light phototropic curvature of hypocotyls when exposed to red light was also confirmed. Both red-light and blue-light phototropic responses were also shown to be affected by directional light intensity. To our knowledge, this is the first characterization of a positive blue-light phototropic response in Arabidopsis roots, as well as the first description of the relationship between these phototropic responses in fractional or reduced gravities.
Description45 p.-9 fig.-3 tab.4 tab.Supl.-2 fig. supl.
Publisher version (URL)http://dx.doi.org/ 10.1007/s00425-016-2581-8
URIhttp://hdl.handle.net/10261/136179
DOI10.1007/s00425-016-2581-8
ISSN0032-0935
E-ISSN1432-2048
Appears in Collections:(CIB) Artículos
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