Auxin biosynthesis and storage forms
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TLDR
The many ways auxin levels are regulated through biosynthesis, storage forms, and inactivation are discussed, and the potential roles modified auxins play in regulating the bioactive pool of auxin to affect plant growth and development are discussed.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.read more
Citations
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Physiological and Agronomical Aspects of Phytohormone Production by Model Plant-Growth-Promoting Rhizobacteria (PGPR) Belonging to the Genus Azospirillum
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Auxin activity: Past, present, and future
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The Structure and Function of Major Plant Metabolite Modifications.
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References
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Journal ArticleDOI
Auxin: regulation, action, and interaction.
Andrew Woodward,Bonnie Bartel +1 more
TL;DR: Nearly six decades after the structural elucidation of IAA, many aspects of auxin metabolism, transport and signalling are well established; however, more than a few fundamental questions and innumerable details remain unresolved.
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A Role for Flavin Monooxygenase-Like Enzymes in Auxin Biosynthesis
Yunde Zhao,Sioux K. Christensen,Christian Fankhauser,John R. Cashman,Jerry D. Cohen,Detlef Weigel,Joanne Chory,Joanne Chory +7 more
TL;DR: Results from tryptophan analog feeding experiments and biochemical assays indicate that YUCCA catalyzes hydroxylation of the amino group of tryptamine, a rate-limiting step in tryptophile-dependent auxin biosynthesis.
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TAA1-Mediated Auxin Biosynthesis Is Essential for Hormone Crosstalk and Plant Development
Anna Stepanova,Joyce Robertson-Hoyt,Jeonga Yun,Larissa M. Benavente,De-Yu Xie,Karel Doležal,Alexandra Schlereth,Gerd Jürgens,Jose M. Alonso +8 more
TL;DR: By characterizing the Arabidopsis wei8 mutant, it is found that a small family of genes mediates tissue-specific responses to ethylene, and the IPA route of auxin production is key to generating robust auxin gradients in response to environmental and developmental cues.
Journal ArticleDOI
Auxin biosynthesis by the YUCCA flavin monooxygenases controls the formation of floral organs and vascular tissues in Arabidopsis
TL;DR: The YUC gene family is defined and it is shown unequivocally that four of the 11 predicted YUC flavin monooxygenases (YUC1, Y UC2, YUC4, and YUC6) play essential roles in auxin biosynthesis and plant development.
Journal ArticleDOI
Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants.
Yi Tao,Jean-Luc Ferrer,Jean-Luc Ferrer,Karin Ljung,Florence Pojer,Fangxin Hong,Fangxin Hong,Jeff A. Long,Lin Li,Javier E. Moreno,Marianne E. Bowman,Lauren J. Ivans,Lauren J. Ivans,Youfa Cheng,Jason Lim,Yunde Zhao,Carlos L. Ballaré,Göran Sandberg,Joseph P. Noel,Joanne Chory +19 more
TL;DR: It is shown that TAA1 catalyzes the formation of indole-3-pyruvic acid (IPA) from L-tryptophan (L-Trp), the first step in a previously proposed, but uncharacterized, auxin biosynthetic pathway, rapidly deployed to synthesize auxin at the high levels required to initiate the multiple changes in body plan associated with shade avoidance.