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PMID:21163961

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Citation

Ellison, CT, Vandenbussche, F, Van Der Straeten, D and Harmer, SL (2011) XAP5 CIRCADIAN TIMEKEEPER regulates ethylene responses in aerial tissues of Arabidopsis. Plant Physiol. 155:988-99

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.

Links

PubMed PMC3032482 Online version:10.1104/pp.110.164277

Keywords

Arabidopsis/genetics; Arabidopsis/metabolism; Arabidopsis/radiation effects; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Arabidopsis Proteins/radiation effects; DNA, Plant/genetics; Ethylenes/metabolism; Gene Expression Regulation, Plant; Genotype; Hypocotyl/growth & development; Light; Mutation; Nuclear Proteins/metabolism; Plant Components, Aerial/growth & development; Plant Components, Aerial/metabolism; Plant Growth Regulators/metabolism; Plant Roots/growth & development; Transcription Factors/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:XCT

acts_upstream_of_or_within

GO:0009873: ethylene-activated signaling pathway

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:XCT

involved_in

GO:0009873: ethylene-activated signaling pathway

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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