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The single evolutionary origin of chlorinated auxin provides a phylogenetically informative trait in the Fabaceae

journal contribution
posted on 2023-05-18, 19:59 authored by Lam, HK, John RossJohn Ross, Erin McAdam, McAdam, SAM
Chlorinated auxin (4-chloroindole-3-acetic acid, 4-Cl-IAA), a highly potent plant hormone, was once thought to be restricted to species of the tribe Fabeae within the Fabaceae, until we recently detected this hormone in the seeds of Medicago, Melilotus and Trifolium species. The absence of 4-Cl-IAA in the seeds of the cultivated species Cicer aeritinum from the Cicerae tribe, immediately basal to the Fabeae and Trifolieae tribes, suggested a single evolutionary origin of 4-Cl-IAA. Here, we provide a more robust phylogenetic placement of the ability to produce chlorinated auxin by screening key species spanning this evolutionary transition. We report no detectable level of 4-Cl-IAA in Cicer echinospermum (a wild relative of C. aeritinum) and 4 species (Galega officinalis, Parochetus communis, Astragalus propinquus and A. sinicus) from tribes or clades more basal or sister to the Cicerae tribe. We did detect 4-Cl-IAA in the dry seeds of 4 species from the genus Ononis that are either basal to the genera Medicago, Melilotus and Trigonella or basal to, but still within, the Fabeae and Trifolieae (ex. Parochetus) clades. We conclude that the single evolutionary origin of this hormone in seeds can be used as a phylogenetically informative trait within the Fabaceae.

Funding

Australian Research Council

History

Publication title

Plant Signaling and Behavior

Volume

11

Issue

7

Article number

e1197467

Number

e1197467

Pagination

1-3

ISSN

1559-2316

Department/School

School of Natural Sciences

Publisher

Taylor & Francis

Place of publication

United States

Rights statement

Copyright 2016 Taylor & Francis Group, LLC

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences

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