dc.contributorUniversity of Maryland
dc.contributorOhio State University
dc.contributorUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T19:04:54Z
dc.date.accessioned2022-12-20T01:02:33Z
dc.date.available2022-04-28T19:04:54Z
dc.date.available2022-12-20T01:02:33Z
dc.date.created2022-04-28T19:04:54Z
dc.date.issued2016-09-27
dc.identifierProceedings of the National Academy of Sciences of the United States of America, v. 113, n. 39, p. 11010-11015, 2016.
dc.identifier1091-6490
dc.identifier0027-8424
dc.identifierhttp://hdl.handle.net/11449/220703
dc.identifier10.1073/pnas.1604769113
dc.identifier2-s2.0-84989874686
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5400832
dc.description.abstractTight homeostatic regulation of the phytohormone auxin [indole-3-acetic acid (IAA)] is essential to plant growth. Auxin biosynthetic pathways and the processes that inactivate auxin by conjugation to amino acids and sugars have been thoroughly characterized. However, the enzyme that catalyzes oxidation of IAA to its primary catabolite 2-oxindole-3-acetic acid (oxIAA) remains uncharacterized. Here, we show that DIOXYGENASE FOR AUXIN OXIDATION 1 (DAO1) catalyzes formation of oxIAA in vitro and in vivo and that this mechanism regulates auxin homeostasis and plant growth. Null dao1-1 mutants contain 95% less oxIAA compared with wild type, and complementation of dao1 restores wild-type oxIAA levels, indicating that DAO1 is the primary IAA oxidase in seedlings. Furthermore, dao1 loss of function plants have altered morphology, including larger cotyledons, increased lateral root density, delayed sepal opening, elongated pistils, and reduced fertility in the primary inflorescence stem. These phenotypes are tightly correlated with DAO1 spatiotemporal expression patterns as shown by DAO1pro:β-glucuronidase (GUS) activity and DAO1pro:YFP-DAO1 signals, and transformation with DAO1pro:YFP-DAO1 complemented the mutant phenotypes. The dominant dao1-2D mutant has increased oxIAA levels and decreased stature with shorter leaves and inflorescence stems, thus supporting DAO1 IAA oxidase function in vivo. A second isoform, DAO2, is very weakly expressed in seedling root apices. Together, these data confirm that IAA oxidation by DAO1 is the principal auxin catabolic process in Arabidopsis and that localized IAA oxidation plays a role in plant morphogenesis.
dc.languageeng
dc.relationProceedings of the National Academy of Sciences of the United States of America
dc.sourceScopus
dc.subjectAuxin homeostasis
dc.subjectAuxin oxidase
dc.subjectAuxin oxidation
dc.subjectFlowers
dc.subjectLateral roots
dc.titleDAO1 catalyzes temporal and tissue-specific oxidative inactivation of auxin in Arabidopsis thaliana
dc.typeArtículos de revistas


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