Journal
ADVANCES IN SPACE RESEARCH
Volume 49, Issue 5, Pages 834-840Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2011.12.004
Keywords
Arabidopsis; Cryptochrome signaling; Flowering; Hypocotyl growth; Near-null magnetic field
Categories
Funding
- National Natural Science Foundation of China [31000382]
- Ministry of Science and Technology of China [2011CB503702]
- Institute of Electrical Engineering of Chinese Academy of Sciences [0950111CS1]
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The blue light receptor, cryptochrome, has been suggested to act as a magnetoreceptor based on the proposition that photochemical reactions are involved in sensing the geomagnetic field. But the effects of the geomagnetic field on cryptochrome remain unclear. Although the functions of cryptochrome have been well demonstrated for Arabidopsis, the effect of the geomagnetic field on the growth of Arabidopsis and its mechanism of action are poorly understood. We eliminated the local geomagnetic field to grow Arabidopsis in a near-null magnetic field and found that the inhibition of Arabidopsis hypocotyl growth by white light was weakened, and flowering time was delayed. The expressions of three cryptochrome-signaling-related genes, PHYB, CO and FT also changed; the transcript level of PHYB was elevated ca. 40%, and that of CO and FT was reduced ca. 40% and 50%, respectively. These data suggest that the effects of a near-null magnetic field on Arabidopsis are cryptochrome-related, which may be revealed by a modification of the active state of cryptochrome and the subsequent signaling cascade. (C) 2011 COSPAR. Published by Elsevier Ltd. All rights reserved.
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