Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 63, Issue 8, Pages 2853-2872Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ers091
Keywords
Auxin; auxin biosynthesis; IAA; indole-3-acetaldehyde; indole-3-acetaldoxime; indole-3-acetamide; indole-3-acetic acid; indole-3-pyruvic acid; plant hormone
Categories
Funding
- Japan Society for the Promotion of Science [23658096]
- Grants-in-Aid for Scientific Research [23658096] Funding Source: KAKEN
Ask authors/readers for more resources
The plant hormone auxin, which is predominantly represented by indole-3-acetic acid (IAA), is involved in the regulation of plant growth and development. Although IAA was the first plant hormone identified, the biosynthetic pathway at the genetic level has remained unclear. Two major pathways for IAA biosynthesis have been proposed: the tryptophan (Trp)-independent and Trp-dependent pathways. In Trp-dependent IAA biosynthesis, four pathways have been postulated in plants: (i) the indole-3-acetamide (IAM) pathway; (ii) the indole-3-pyruvic acid (IPA) pathway; (iii) the tryptamine (TAM) pathway; and (iv) the indole-3-acetaldoxime (IAOX) pathway. Although different plant species may have unique strategies and modifications to optimize their metabolic pathways, plants would be expected to share evolutionarily conserved core mechanisms for auxin biosynthesis because IAA is a fundamental substance in the plant life cycle. In this review, the genes now known to be involved in auxin biosynthesis are summarized and the major IAA biosynthetic pathway distributed widely in the plant kingdom is discussed on the basis of biochemical and molecular biological findings and bioinformatics studies. Based on evolutionarily conserved core mechanisms, it is thought that the pathway via IAM or IPA is the major route(s) to IAA in plants.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available