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Evidence that chlorinated auxin is restricted to the Fabaceae but not to the Fabeae
journal contribution
posted on 2023-05-18, 09:55 authored by Lam, HK, McAdam, SAM, Erin McAdam, John RossJohn RossAuxin is a pivotal plant hormone, usually occurring in the form of indole-3-acetic acid (IAA). However, in maturing pea (Pisum sativum) seeds, the level of the chlorinated auxin, 4-chloroindole-3-acetic acid (4-Cl-IAA), greatly exceeds that of IAA. A key issue is how plants produce halogenated compounds such as 4-Cl-IAA. To better understand this topic, we investigated the distribution of the chlorinated auxin. We show for the first time, to our knowledge, that 4-Cl-IAA is found in the seeds of Medicago truncatula, Melilotus indicus, and three species of Trifolium. Furthermore, we found no evidence that Pinus spp. synthesize 4-Cl-IAA in seeds, contrary to a previous report. The evidence indicates a single evolutionary origin of 4-Cl-IAA synthesis in the Fabaceae, which may provide an ideal model system to further investigate the action and activity of halogenating enzymes in plants.
Funding
Australian Research Council
History
Publication title
Plant PhysiologyVolume
168Pagination
798-803ISSN
0032-0889Department/School
School of Natural SciencesPublisher
Amer Soc Plant BiologistsPlace of publication
15501 Monona Drive, Rockville, USA, Md, 20855Rights statement
Copyright © 2015 American Society of Plant BiologistsRepository Status
- Restricted