Where is auxin synthesized in plants

Abstract Auxin is an important plant hormone essential for many aspects of plant growth and development. Indole-3-acetic acid (IAA) is the most studied auxin in plants, and its biosynthesis pathway has been investigated for over 70 years. Although the complete picture of auxin biosynthesis remains to be elucidated, remarkable progress has been made recently in understanding the mechanism of IAA biosynthesis. Genetic and biochemical studies demonstrate that IAA is mainly synthesized from l-tryptophan (Trp) via indole-3-pyruvate by two-step reactions in Arabidopsis. While IAA is also produced from Trp via indole-3-acetaldoxime in Arabidopsis, this pathway likely plays an auxiliary role in plants of the family Brassicaceae. Recent studies suggest that the Trp-independent pathway is not a major route for IAA biosynthesis, but they reveal an important role for a cytosolic indole synthase in this pathway. In this review, I summarize current views and future prospects of IAA biosynthesis research in plants. In 1880, Charles and Francis Darwin discovered that light was perceived by the tips of grass coleoptiles and proposed that the stimulus was transmitted to the lower tissues to promote a tropic growth toward light. 1–3 ) They collected a growth-promoting substance, later named auxin, from grass coleoptile tips and demonstrated that the phototropic response was caused by the asymmetric distribution of this substance. 3 ) In the 1930s, indole-3-acetic acid (IAA) was identified as...

The root meristem can regenerate following removal of its stem-cell niche by recruitment of remnant cells from the stump. Regeneration is initiated by rapid accumulation of auxin near the injury site but the source of this auxin is unknown. Here, we show that auxin accumulation arises from the activity of multiple auxin biosynthetic sources that are newly specified near the cut site and that their continuous activity is required for the regeneration process. Auxin synthesis is highly localized while PIN-mediated transport is dispensable for auxin accumulation and tip regeneration. Roots lacking the activity of the regeneration competence factor ERF115, or that are dissected at a zone of low regeneration potential, fail to activate local auxin sources. Remarkably, restoring auxin supply is sufficient to confer regeneration capacity to these recalcitrant tissues. We suggest that regeneration competence relies on the ability to specify new local auxin sources in a precise temporal pattern. • Heidstra, R. & Sabatini, S. Plant and animal stem cells: similar yet different. Nat. Rev. Mol. Cell Biol. 15, 301–312 (2014). • Feldman, L. J. The de novo origin of the quiescent center regenerating root apices of Zea mays. Planta 128, 207–212 (1976). • Sena, G., Wang, X., Liu, H.-Y., Hofhuis, H. & Birnbaum, K. D. Organ regeneration does not require a functional stem cell niche in plants. Nature 457, 1150–1153 (2009). • Reinhardt, D., Frenz, M., Mandel, T. & Kuhlemeier, C. Microsurgical a...

Indole-3-acetic acid (IAA), the main naturally occurring auxin, is essential for almost every aspect of plant growth and development. However, only recently have studies finally established the first complete auxin biosynthesis pathway that converts tryptophan (Trp) to IAA in plants. Trp is first converted to indole-3-pyruvate (IPA) by the TAA family of amino transferases and subsequently IAA is produced from IPA by the YUC family of flavin monooxygenases. The two-step conversion of Trp to IAA is the main auxin biosynthesis pathway that plays an essential role in many developmental processes. • Previous article in issue • Next article in issue • About ScienceDirect • Remote access • Shopping cart • Advertise • Contact and support • Terms and conditions • Privacy policy We use cookies to help provide and enhance our service and tailor content and ads. By continuing you agree to the use of cookies. Copyright © 2023 Elsevier B.V. or its licensors or contributors. ScienceDirect® is a registered trademark of Elsevier B.V. ScienceDirect® is a registered trademark of Elsevier B.V.

Plant environment is a complex system where coordinated interactive biology involving various metabolite products and other intermediates determines the overall development and growth of plant. Among the phytohormones, auxins play a fundamental role in various signaling pathways involving other hormones and metabolites affecting cell division and differentiation of plant tissues. Likewise, phenolics are the secondary metabolites secreted by plants that play a key role as defense agents during environmental stress conditions. Biosynthesis of auxins and phenolics follows different metabolic pathways, although shikimate pathway is considered as the root for the production of auxins and phenolics following the synthesis of their corresponding precursors. The interactions between these two compounds may have some physiological and biochemical alterations in plant metabolism, thus affecting plant biology. In addition, the role of soil microbiota is also evident to mediate the communicative behavior of both auxins and phenolics. Phenolic compounds may affect auxin transport and play its role in defense signaling of plants. Some representative examples regarding interactive biology of auxins and phenolic compounds under in vitro conditions are also discussed in this chapter. Keywords • Biology • Auxins • Phenolics • Environment • Signal pathways • Abdel-Lateif K, Bogusz D, Hocher V (2012) The role of flavonoids in the establishment of plant roots endosymbioses with arbuscular myco...

Indole-3-acetic acid (IAA), the main naturally occurring auxin, is essential for almost every aspect of plant growth and development. However, only recently have studies finally established the first complete auxin biosynthesis pathway that converts tryptophan (Trp) to IAA in plants. Trp is first converted to indole-3-pyruvate (IPA) by the TAA family of amino transferases and subsequently IAA is produced from IPA by the YUC family of flavin monooxygenases. The two-step conversion of Trp to IAA is the main auxin biosynthesis pathway that plays an essential role in many developmental processes. • Previous article in issue • Next article in issue • About ScienceDirect • Remote access • Shopping cart • Advertise • Contact and support • Terms and conditions • Privacy policy We use cookies to help provide and enhance our service and tailor content and ads. By continuing you agree to the use of cookies. Copyright © 2023 Elsevier B.V. or its licensors or contributors. ScienceDirect® is a registered trademark of Elsevier B.V. ScienceDirect® is a registered trademark of Elsevier B.V.

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The root meristem can regenerate following removal of its stem-cell niche by recruitment of remnant cells from the stump. Regeneration is initiated by rapid accumulation of auxin near the injury site but the source of this auxin is unknown. Here, we show that auxin accumulation arises from the activity of multiple auxin biosynthetic sources that are newly specified near the cut site and that their continuous activity is required for the regeneration process. Auxin synthesis is highly localized while PIN-mediated transport is dispensable for auxin accumulation and tip regeneration. Roots lacking the activity of the regeneration competence factor ERF115, or that are dissected at a zone of low regeneration potential, fail to activate local auxin sources. Remarkably, restoring auxin supply is sufficient to confer regeneration capacity to these recalcitrant tissues. We suggest that regeneration competence relies on the ability to specify new local auxin sources in a precise temporal pattern. • Heidstra, R. & Sabatini, S. Plant and animal stem cells: similar yet different. Nat. Rev. Mol. Cell Biol. 15, 301–312 (2014). • Feldman, L. J. The de novo orig...

Plant environment is a complex system where coordinated interactive biology involving various metabolite products and other intermediates determines the overall development and growth of plant. Among the phytohormones, auxins play a fundamental role in various signaling pathways involving other hormones and metabolites affecting cell division and differentiation of plant tissues. Likewise, phenolics are the secondary metabolites secreted by plants that play a key role as defense agents during environmental stress conditions. Biosynthesis of auxins and phenolics follows different metabolic pathways, although shikimate pathway is considered as the root for the production of auxins and phenolics following the synthesis of their corresponding precursors. The interactions between these two compounds may have some physiological and biochemical alterations in plant metabolism, thus affecting plant biology. In addition, the role of soil microbiota is also evident to mediate the communicative behavior of both auxins and phenolics. Phenolic compounds may affect auxin transport and play its role in defense signaling of plants. Some representative examples regarding interactive biology of auxins and phenolic compounds under in vitro conditions are also discussed in this chapter. Keywords • Biology • Auxins • Phenolics • Environment • Signal pathways • Abdel-Lateif K, Bogusz D, Hocher V (2012) The role of flavonoids in the establishment of plant roots endosymbioses with arbuscular myco...

Abstract Auxin is an important plant hormone essential for many aspects of plant growth and development. Indole-3-acetic acid (IAA) is the most studied auxin in plants, and its biosynthesis pathway has been investigated for over 70 years. Although the complete picture of auxin biosynthesis remains to be elucidated, remarkable progress has been made recently in understanding the mechanism of IAA biosynthesis. Genetic and biochemical studies demonstrate that IAA is mainly synthesized from l-tryptophan (Trp) via indole-3-pyruvate by two-step reactions in Arabidopsis. While IAA is also produced from Trp via indole-3-acetaldoxime in Arabidopsis, this pathway likely plays an auxiliary role in plants of the family Brassicaceae. Recent studies suggest that the Trp-independent pathway is not a major route for IAA biosynthesis, but they reveal an important role for a cytosolic indole synthase in this pathway. In this review, I summarize current views and future prospects of IAA biosynthesis research in plants. In 1880, Charles and Francis Darwin discovered that light was perceived by the tips of grass coleoptiles and proposed that the stimulus was transmitted to the lower tissues to promote a tropic growth toward light. 1–3 ) They collected a growth-promoting substance, later named auxin, from grass coleoptile tips and demonstrated that the phototropic response was caused by the asymmetric distribution of this substance. 3 ) In the 1930s, indole-3-acetic acid (IAA) was identified as...

Abstract Auxin is an important plant hormone essential for many aspects of plant growth and development. Indole-3-acetic acid (IAA) is the most studied auxin in plants, and its biosynthesis pathway has been investigated for over 70 years. Although the complete picture of auxin biosynthesis remains to be elucidated, remarkable progress has been made recently in understanding the mechanism of IAA biosynthesis. Genetic and biochemical studies demonstrate that IAA is mainly synthesized from l-tryptophan (Trp) via indole-3-pyruvate by two-step reactions in Arabidopsis. While IAA is also produced from Trp via indole-3-acetaldoxime in Arabidopsis, this pathway likely plays an auxiliary role in plants of the family Brassicaceae. Recent studies suggest that the Trp-independent pathway is not a major route for IAA biosynthesis, but they reveal an important role for a cytosolic indole synthase in this pathway. In this review, I summarize current views and future prospects of IAA biosynthesis research in plants. In 1880, Charles and Francis Darwin discovered that light was perceived by the tips of grass coleoptiles and proposed that the stimulus was transmitted to the lower tissues to promote a tropic growth toward light. 1–3 ) They collected a growth-promoting substance, later named auxin, from grass coleoptile tips and demonstrated that the phototropic response was caused by the asymmetric distribution of this substance. 3 ) In the 1930s, indole-3-acetic acid (IAA) was identified as...

Plant environment is a complex system where coordinated interactive biology involving various metabolite products and other intermediates determines the overall development and growth of plant. Among the phytohormones, auxins play a fundamental role in various signaling pathways involving other hormones and metabolites affecting cell division and differentiation of plant tissues. Likewise, phenolics are the secondary metabolites secreted by plants that play a key role as defense agents during environmental stress conditions. Biosynthesis of auxins and phenolics follows different metabolic pathways, although shikimate pathway is considered as the root for the production of auxins and phenolics following the synthesis of their corresponding precursors. The interactions between these two compounds may have some physiological and biochemical alterations in plant metabolism, thus affecting plant biology. In addition, the role of soil microbiota is also evident to mediate the communicative behavior of both auxins and phenolics. Phenolic compounds may affect auxin transport and play its role in defense signaling of plants. Some representative examples regarding interactive biology of auxins and phenolic compounds under in vitro conditions are also discussed in this chapter. Keywords • Biology • Auxins • Phenolics • Environment • Signal pathways • Abdel-Lateif K, Bogusz D, Hocher V (2012) The role of flavonoids in the establishment of plant roots endosymbioses with arbuscular myco...