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XAP5 circadian timekeeper regulates ethylene responses in aerial tissues of Arabidopsis

Cory T Ellison, Filip Vandenbussche UGent, Dominique Van Der Straeten UGent and Stacey L Harmer (2011) PLANT PHYSIOLOGY. 155(2). p.988-999
abstract
The phytohormone ethylene differentially regulates plant architecture and growth in both a light-and nutrient-dependent fashion. The modulation of plant development by ethylene in response to both external and internal signals can also generate tissue-specific differential responses. Here, we report that XAP5 CIRCADIAN TIMEKEEPER (XCT) is involved in blue light-dependent ethylene responses in the aerial tissues of Arabidopsis (Arabidopsis thaliana) seedlings. XCT was first identified as a circadian clock mutant with a short free-running period. The xct mutation also causes sugar-specific hypocotyl growth defects, in which mutants are short in blue light when grown on a sucrose-rich medium but tall when grown on sucrose-deficient medium. Our data suggest that the hypocotyl defects in blue light are not directly caused by defects in clock or light signaling but rather by enhanced ethylene responses. In blue light, xct mutants have a more active ethylene response pathway and exhibit growth phenotypes similar to the constitutive ethylene signaling mutant constitutive triple response1 (ctr1). xct mutants also have reduced ethylene emission, analogous to plants that have lost CTR1 function. Genetic analysis suggests that XCT negatively regulates ethylene responses downstream of ETHYLENE-INSENSITIVE3 in aerial tissues. However, XCT is not required for all ethylene-mediated processes, such as the inhibition of root growth. Thus, XCT acts downstream of a major transcriptional regulator in an organ-specific manner, playing an environment-dependent role in the regulation of plant growth.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
HYPOCOTYL ELONGATION, TRANSCRIPTION FACTOR, SIGNALING PATHWAY, PLANT CIRCADIAN CLOCK, STABILITY, DISTINCT, LIGHT, BIOSYNTHESIS, PROTEIN, GROWTH
journal title
PLANT PHYSIOLOGY
Plant Physiol.
volume
155
issue
2
pages
988 - 999
Web of Science type
Article
Web of Science id
000286880800029
JCR category
PLANT SCIENCES
JCR impact factor
6.535 (2011)
JCR rank
7/189 (2011)
JCR quartile
1 (2011)
ISSN
0032-0889
DOI
10.1104/pp.110.164277
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1195196
handle
http://hdl.handle.net/1854/LU-1195196
date created
2011-03-23 11:07:52
date last changed
2011-05-02 16:29:06
@article{1195196,
  abstract     = {The phytohormone ethylene differentially regulates plant architecture and growth in both a light-and nutrient-dependent fashion. The modulation of plant development by ethylene in response to both external and internal signals can also generate tissue-specific differential responses. Here, we report that XAP5 CIRCADIAN TIMEKEEPER (XCT) is involved in blue light-dependent ethylene responses in the aerial tissues of Arabidopsis (Arabidopsis thaliana) seedlings. XCT was first identified as a circadian clock mutant with a short free-running period. The xct mutation also causes sugar-specific hypocotyl growth defects, in which mutants are short in blue light when grown on a sucrose-rich medium but tall when grown on sucrose-deficient medium. Our data suggest that the hypocotyl defects in blue light are not directly caused by defects in clock or light signaling but rather by enhanced ethylene responses. In blue light, xct mutants have a more active ethylene response pathway and exhibit growth phenotypes similar to the constitutive ethylene signaling mutant constitutive triple response1 (ctr1). xct mutants also have reduced ethylene emission, analogous to plants that have lost CTR1 function. Genetic analysis suggests that XCT negatively regulates ethylene responses downstream of ETHYLENE-INSENSITIVE3 in aerial tissues. However, XCT is not required for all ethylene-mediated processes, such as the inhibition of root growth. Thus, XCT acts downstream of a major transcriptional regulator in an organ-specific manner, playing an environment-dependent role in the regulation of plant growth.},
  author       = {Ellison, Cory T and Vandenbussche, Filip and Van Der Straeten, Dominique and Harmer, Stacey L},
  issn         = {0032-0889},
  journal      = {PLANT PHYSIOLOGY},
  keyword      = {HYPOCOTYL ELONGATION,TRANSCRIPTION FACTOR,SIGNALING PATHWAY,PLANT CIRCADIAN CLOCK,STABILITY,DISTINCT,LIGHT,BIOSYNTHESIS,PROTEIN,GROWTH},
  language     = {eng},
  number       = {2},
  pages        = {988--999},
  title        = {XAP5 circadian timekeeper regulates ethylene responses in aerial tissues of Arabidopsis},
  url          = {http://dx.doi.org/10.1104/pp.110.164277},
  volume       = {155},
  year         = {2011},
}

Chicago
Ellison, Cory T, Filip Vandenbussche, Dominique Van Der Straeten, and Stacey L Harmer. 2011. “XAP5 Circadian Timekeeper Regulates Ethylene Responses in Aerial Tissues of Arabidopsis.” Plant Physiology 155 (2): 988–999.
APA
Ellison, C. T., Vandenbussche, F., Van Der Straeten, D., & Harmer, S. L. (2011). XAP5 circadian timekeeper regulates ethylene responses in aerial tissues of Arabidopsis. PLANT PHYSIOLOGY, 155(2), 988–999.
Vancouver
1.
Ellison CT, Vandenbussche F, Van Der Straeten D, Harmer SL. XAP5 circadian timekeeper regulates ethylene responses in aerial tissues of Arabidopsis. PLANT PHYSIOLOGY. 2011;155(2):988–99.
MLA
Ellison, Cory T, Filip Vandenbussche, Dominique Van Der Straeten, et al. “XAP5 Circadian Timekeeper Regulates Ethylene Responses in Aerial Tissues of Arabidopsis.” PLANT PHYSIOLOGY 155.2 (2011): 988–999. Print.