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Modulation of Ethylene Responses Affects Plant Salt-Stress Responses
- Source :
- Plant Physiology. 143:707-719
- Publication Year :
- 2006
- Publisher :
- Oxford University Press (OUP), 2006.
-
Abstract
- Ethylene signaling plays important roles in multiple aspects of plant growth and development. Its functions in abiotic stress responses remain largely unknown. Here, we report that alteration of ethylene signaling affected plant salt-stress responses. A type II ethylene receptor homolog gene NTHK1 (Nicotiana tabacum histidine kinase 1) from tobacco (N. tabacum) conferred salt sensitivity in NTHK1-transgenic Arabidopsis (Arabidopsis thaliana) plants as judged from the phenotypic change, the relative electrolyte leakage, and the relative root growth under salt stress. Ethylene precursor 1-aminocyclopropane-1-carboxylic acid suppressed the salt-sensitive phenotype. Analysis of Arabidopsis ethylene receptor gain-of-function mutants further suggests that receptor function may lead to salt-sensitive responses. Mutation of EIN2, a central component in ethylene signaling, also results in salt sensitivity, suggesting that EIN2-mediated signaling is beneficial for plant salt tolerance. Overexpression of the NTHK1 gene or the receptor gain-of-function activated expression of salt-responsive genes AtERF4 and Cor6.6. In addition, the transgene NTHK1 mRNA was accumulated under salt stress, suggesting a posttranscriptional regulatory mechanism. These findings imply that ethylene signaling may be required for plant salt tolerance.
- Subjects :
- Ethylene
Physiology
Transgene
Nicotiana tabacum
Mutant
Arabidopsis
Receptors, Cell Surface
Plant Science
Sodium Chloride
Plant Roots
Electrolytes
chemistry.chemical_compound
Gene Expression Regulation, Plant
Tobacco
Genetics
Arabidopsis thaliana
RNA, Messenger
Plant Proteins
biology
Abiotic stress
fungi
food and beverages
Ethylenes
Plants, Genetically Modified
biology.organism_classification
Biochemistry
chemistry
Signal transduction
Signal Transduction
Research Article
Subjects
Details
- ISSN :
- 15322548
- Volume :
- 143
- Database :
- OpenAIRE
- Journal :
- Plant Physiology
- Accession number :
- edsair.doi.dedup.....b150c7efb64c89872e995f35cdee80c5