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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zhu, Jianhua Gong, Zhizhong Zhang, Changqing Song, Chun-Peng Damsz, Barbara Inan, Günsu Koiwa, Hisashi Zhu, Jian-Kang Hasegawa, Paul M. Bressan, Ray A. |
| Description | Country affiliation: United States Author Affiliation: Zhu J ( Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907-1165, USA.) |
| Abstract | To identify the genetic loci that control salt tolerance in higher plants, a large-scale screen was conducted with a bialaphos marker-based T-DNA insertional collection of Arabidopsis ecotype C24 mutants. One line, osm1 (for osmotic stress-sensitive mutant), exhibited increased sensitivity to both ionic (NaCl) and nonionic (mannitol) osmotic stress in a root-bending assay. The osm1 mutant displayed a more branched root pattern with or without stress and was hypersensitive to inhibition by Na(+), K(+), and Li(+) but not Cs(+). Plants of the osm1 mutant also were more prone to wilting when grown with limited soil moisture compared with wild-type plants. The stomata of osm1 plants were insensitive to both ABA-induced closing and inhibition of opening compared with wild-type plants. The T-DNA insertion appeared in the first exon of an open reading frame on chromosome 1 (F3M18.7, which is the same as AtSYP61). This insertion mutation cosegregated closely with the osm1 phenotype and was the only functional T-DNA in the mutant genome. Expression of the OSM1 gene was disrupted in mutant plants, and abnormal transcripts accumulated. Gene complementation with the native gene from the wild-type genome completely restored the mutant phenotype to the wild type. Analysis of the deduced amino acid sequence of the affected gene revealed that OSM1 is related most closely to mammalian syntaxins 6 and 10, which are members of the SNARE superfamily of proteins required for vesicular/target membrane fusions. Expression of the OSM1 promoter::beta-glucuronidase gene in transformants indicated that OSM1 is expressed in all tissues except hypocotyls and young leaves and is hyperexpressed in epidermal guard cells. Together, our results demonstrate important roles of OSM1/SYP61 in osmotic stress tolerance and in the ABA regulation of stomatal responses. |
| File Format | HTM / HTML |
| ISSN | 10404651 |
| e-ISSN | 1531298X |
| Journal | THE PLANT CELL ONLINE |
| Issue Number | 12 |
| Volume Number | 14 |
| Language | English |
| Publisher | American Society of Plant Biologists |
| Publisher Date | 2002-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Botany Abscisic Acid Pharmacology Adaptation, Physiological Physiology Arabidopsis Proteins Genetics Arabidopsis Membrane Proteins Amino Acid Sequence Metabolism Cloning, Molecular Dna, Bacterial Chemistry Desiccation Gene Expression Regulation, Plant Drug Effects Genetic Complementation Test Glucuronidase Hydroxides Lithium Chloride Molecular Sequence Data Mutation Osmotic Pressure Plant Epidermis Cytology Plant Roots Growth & Development Plant Shoots Potassium Chloride Potassium Compounds Promoter Regions, Genetic Qa-snare Proteins Sequence Homology, Amino Acid Sodium Chloride Sorbitol Stress, Mechanical Research Support, U.s. Gov't, Non-p.h.s. |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Plant Science |
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