Ethylene can stimulate Arabidopsis hypocotyl elongation in the light

• DOI: 10.1073/pnas.94.6.2756
• Publication Date: 2002-07-26T14:43:20Z
• Authors: Jan Smalle; Mira Haegman; Jasmina Kurepa; Marc Van Montagu; Dominique Van Der...
• Keywords: Etiolation; Elongation

Ethylene inhibits hypocotyl elongation in etiolated Arabidopsis seedlings. However, when was grown the light presence of ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), a marked induction occurred. This resulted from an increase cell expansion rather than division. The effects and ACC were antagonized by action inhibitor Ag + . response absent weakened set ethylene-insensitive mutants ( etr1-3 , ein2-1 ein3-1 ein4 ain1-10 ein7 ). With exception degree inhibition correlated with strength phenotype based on triple assay. In addition, constitutive mutant ctr1-1 light, had longer wild type. Exogenous auxin also induced light-grown Again, abolished treatment suggesting that might be mediator. results showed that, depending conditions, can induce opposite hypocotyls.