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| Content Provider | PubMed Central |
|---|---|
| Author | Beaudoin, Nathalie Carine, Serizet Gosti, Françoise Jérôme, Giraudat |
| Copyright Year | 2000 |
| Abstract | We screened for mutations that either enhanced or suppressed the abscisic acid (ABA)–resistant seed germination phenotype of the Arabidopsis abi1-1 mutant. Alleles of the constitutive ethylene response mutant ctr1 and ethylene-insensitive mutant ein2 were recovered as enhancer and suppressor mutations, respectively. Using these and other ethylene response mutants, we showed that the ethylene signaling cascade defined by the ETR1, CTR1, and EIN2 genes inhibits ABA signaling in seeds. Furthermore, epistasis analysis between ethylene- and ABA-insensitive mutations indicated that endogenous ethylene promotes seed germination by decreasing sensitivity to endogenous ABA. In marked contrast to the situation in seeds, ein2 and etr1-1 roots were resistant to both ABA and ethylene. Our data indicate that ABA inhibition of root growth requires a functional ethylene signaling cascade, although this inhibition is apparently not mediated by an increase in ethylene biosynthesis. These results are discussed in the context of the other hormonal regulations controlling seed germination and root growth. |
| Starting Page | 1103 |
| File Format | |
| ISSN | 1532298X |
| e-ISSN | 1532298X |
| Journal | The Plant Cell |
| Issue Number | 7 |
| Volume Number | 12 |
| Language | English |
| Publisher | American Society of Plant Physiologists |
| Publisher Date | 2000-07-01 |
| Access Restriction | Open |
| Rights Holder | American Society of Plant Physiologists |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Plant Science |
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