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- Title
Light as stress factor to plant roots -- case of root halotropism.
- Authors
Tomoko Kagenishi; Baluška, František; Ken Yokawa; Fasano, Rossella
- Abstract
Despite growing underground, largely in darkness, roots emerge to be very sensitive to light. Recently, several important papers have been published which reveal that plant roots not only express all known light receptors but also that their growth, physiology and adaptive stress responses are light-sensitive. In Arabidopsis, illumination of roots speedsup root growth via reactive oxygen species-mediated and F-actin dependent process. On the other hand, keeping Arabidopsis roots in darkness alters F-actin distribution, polar localization of PIN proteins aswell as polar transport of auxin. Several signaling components activated by phytohormones are overlapping with light-related signaling cascade. We demonstrated that the sensitivity of roots to salinity is altered in the light-grownArabidopsis roots. Particularly, light-exposed roots are less effective in their salt-avoidance behavior known as root halotropism. Here we discuss these new aspects of light-mediated root behavior from cellular, physiological and evolutionary perspectives.
- Subjects
PLANT roots; EFFECT of light on plants; REACTIVE oxygen species; PLANT hormones; TROPISMS; PLANT growth
- Publication
Frontiers in Plant Science, 2014, Vol 5, p1
- ISSN
1664-462X
- Publication type
Article
- DOI
10.3389/fpls.2014.00718