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Review
. 2013 Jun;64(9):2541-55.
doi: 10.1093/jxb/ert080. Epub 2013 Apr 11.

Auxin biosynthesis and storage forms

David A Korasick  1 , Tara A Enders, Lucia C Strader
Affiliations
Review

Auxin biosynthesis and storage forms

David A Korasick et al. J Exp Bot. 2013 Jun.

Abstract

The plant hormone auxin drives plant growth and morphogenesis. The levels and distribution of the active auxin indole-3-acetic acid (IAA) are tightly controlled through synthesis, inactivation, and transport. Many auxin precursors and modified auxin forms, used to regulate auxin homeostasis, have been identified; however, very little is known about the integration of multiple auxin biosynthesis and inactivation pathways. This review discusses the many ways auxin levels are regulated through biosynthesis, storage forms, and inactivation, and the potential roles modified auxins play in regulating the bioactive pool of auxin to affect plant growth and development.

Keywords: IAA; IBA.; auxin; auxin biosynthesis; auxin conjugates; development.

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Figures

Fig. 1.
Fig. 1.
Naturally occurring and synthetic active auxins. (A) Indole-3-acetic acid (IAA), 4-chloroindole-3-acetic acid (4-Cl-IAA), and phenylacetic acid (PAA) are naturally occurring active auxins. (B) 2,4-Dichlorophenoxyacetic acid (2,4-D), 1-naphthaleneacetic acid (NAA), 3,6-dichloro-2-methoxybenzoic acid (dicamba), and 4-amino-3,5,6-trichloropicolinic acid (picloram) are active synthetic auxins.
Fig. 2.
Fig. 2.
Potential IAA biosynthetic pathways. Arrows in pathways for which enzymes have been identified are solid and arrows in pathways that have not been identified are dashed and may be single or multiple steps.
Fig. 3.
Fig. 3.
Potential IAA storage form pathways. Arrows at steps for which enzymes have been identified are solid and arrows in pathways that have not been identified are dashed and may be single or multiple steps.
Fig. 4.
Fig. 4.
Potential IAA inactivation pathways. Arrows in pathways for which enzymes have been identified are solid and arrows in pathways that have not been identified are dashed and may be single or multiple steps.
See this image and copyright information in PMC

References

    1. Abe H, Uchiyama M, Sato R. 1974. Isolation of phenylacetic acid and its p-hydroxy derivative as auxin-like substances from Undaria pinnatifida . Agricultural and Biological Chemistry 38, 897–898
    1. Andreae WA, Good NE. 1955. the formation of indoleacetylaspartic acid in pea seedlings. Plant Physiology 30, 380–382 - PMC - PubMed
    1. Aung LH. 1972. The nature of root-promoting substances in Lycopersicon esculentum seedlings. Physiologia Plantarum 26, 306–309
    1. Badenoch-Jones J, Summons RE, Rolfe BG, Letham DS. 1984. Phytohormones, Rhizobium mutants, and nodulation in legumes. IV. Auxin metabolites in pea root nodules. Journal of Plant Growth Regulation 3, 23–39
    1. Bajguz A, Piotrowska A. 2009. Conjugates of auxin and cytokinin. Phytochemistry 70, 957–969 - PubMed

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