Control of Endogenous Auxin Levels in Plant Root Development

Olatunji, Damilola; Geelen, Danny; Verstraeten, Inge

doi:10.3390/ijms18122587

Cited by 139 publications

(101 citation statements)

References 294 publications

(419 reference statements)

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“…The relatively high rooting percentage on microcuttings under the control treatment can be explained by the fact that the adventitious rooting in stem cuttings is also strongly influenced by the natural endogenous auxin produced by the leaves and buds, which moves naturally to the cuttings base promoting cells division and differentiation into a new root system (Zuffellato-Ribas & Rodrigues, 2001;Olatunji et al, 2017).…”

Section: Ex Vitro Rooting and Acclimatizationmentioning

confidence: 99%

Micropropagation and Establishment of Humulus lupulus L. Plantlets Under Field Conditions at Southern Brazil

Machado¹,

Gomes²,

Francisco³

et al. 2018

JAS

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Tissue culture technique can be an important approach for the rapid propagation of Humulus lupulus L. (hop plant). The present study evaluated different culture media for hop plants (cv. Columbus) in vitro shoots multiplication, as well as ex vitro rooting and plantlets establishment under field conditions at Southern Brazil. The culture medium containing the plant growth regulator thidiazuron (TDZ) resulted in greater in vitro shoots multiplications (five shoots per explant). For microcuttings ex vitro rooting, indole-3-butyric acid (IBA) application at a concentration of 3000 mg L -1 resulted in higher rooting and survival percentages during acclimatization. After 90 days of acclimatization, the plantlets were transplanted under field conditions and had their development and productivity evaluated 122 days after transplanting. Micropropagated plants achieved 100% survival under field conditions. Nitrogen supply is highly necessary for hop plants initial development at Southern Brazil. Micropropagation is a viable technique for quality plantlet production of H. lupulus cv. Columbus.

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Section: Ex Vitro Rooting and Acclimatizationmentioning

confidence: 99%

Micropropagation and Establishment of Humulus lupulus L. Plantlets Under Field Conditions at Southern Brazil

Machado¹,

Gomes²,

Francisco³

et al. 2018

JAS

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“…In Arabidopsis, IAA can be synthesized by both tryptophan (Trp)-dependent and -independent ways and the Trp-dependent way is much better characterized compared to the other one [10]. The Trp-dependent way includes four pathways utilizing different substrates derived from Trp metabolism, namely, Trp-dependent way includes four pathways utilizing different substrates derived from Trp metabolism, namely, indole-3-acetaldoxime (IAOx), indole-3-acetamide (IAM), indole-3-pyruvic acid (IPyA), and tryptamine (TAM) (Figure 1) [11][12][13]. However, only the IPyA pathway in plants has been firmly completed, which consists of a two-step reaction converting the Trp into IAA [10,12].…”

Section: Introductionmentioning

confidence: 99%

“…In this pathway, IAA is firstly converted into IPyA by a reversible amino transfer reaction with the help of TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA) [10]. The level of IPyA is steadily maintained since IPyA can be efficiently converted back to Trp by VAS1 (reversal of SAV1) using methionine (Met) as amino donor [11]. Then, YUCCA (YUC)-type flavin-containing monooxygenases (FMO) catalyze the rate-limiting irreversible reaction: the oxidative decarboxylation of IPyA to form IAA [14,15].…”

Section: Introductionmentioning

confidence: 99%

The Roles of Auxin Biosynthesis YUCCA Gene Family in Plants

Cao

Yang

Shang

et al. 2019

IJMS

119

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Auxin plays essential roles in plant normal growth and development. The auxin signaling pathway relies on the auxin gradient within tissues and cells, which is facilitated by both local auxin biosynthesis and polar auxin transport (PAT). The TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA)/YUCCA (YUC) pathway is the most important and well-characterized pathway that plants deploy to produce auxin. YUCs function as flavin-containing monooxygenases (FMO) catalyzing the rate-limiting irreversible oxidative decarboxylation of indole-3-pyruvate acid (IPyA) to form indole-3-acetic acid (IAA). The spatiotemporal dynamic expression of different YUC gene members finely tunes the local auxin biosynthesis in plants, which contributes to plant development as well as environmental responses. In this review, the recent advances in the identification, evolution, molecular structures, and functions in plant development and stress response regarding the YUC gene family are addressed.

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“…Thus a role for AGPs in Ca 2+ -signalling was unexpected yet surprisingly close to reality with AGP-Ca 2+ belatedly seen here as the major dynamic source of Ca 2+ regulated by auxin. Significantly, transformed plants that overproduce auxin show excessive xylem and phloem development [87] and bushy phenotypes [88].…”

Section: Rootsmentioning

confidence: 99%

The Role of the Primary Cell Wall in Plant Morphogenesis

Lamport¹,

Li²,

Held³

et al. 2018

Preprint

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Morphogenesis remains a riddle, wrapped in a mystery, inside an enigma. It remains a formidable problem viewed from many different perspectives of morphology, genetics, and computational modelling. We propose a biochemical reductionist approach that shows how both internal and external physical forces contribute to plant morphogenesis via mechanical stress-strain transduction from the primary cell wall tethered to the plasma membrane by a specific arabinogalactan protein (AGP). The resulting stress vector with direction defined by Hechtian adhesion sites, has a magnitude of a few picoNewtons amplified by a hypothetical Hechtian growth oscillator. This paradigm shift involves stress activated plasma membrane Ca . Thus, as the immediate source of cytosolic Ca 2+ an AGP-Ca 2+ capacitor directs vectorial exocytosis of cell wall precursors and auxin efflux (PIN) proteins. In toto these components comprise the Hechtian Oscillator and also the gravisensor. Thus interdependent auxin and Ca 2+ morphogen gradients account for the predominance of AGPs. The size and location of a cell surface AGP-Ca 2+-capacitor is essential to differentiation and explains AGP correlation with all stages of morphogenetic patterning from embryogenesis to root and shoot. Finally, evolutionary origins of the Hechtian Oscillator in the unicellular Chlorophycean algae reflect the ubiquitous role of chemiosmotic proton pumps that preceded DNA at the dawn of life.

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Control of Endogenous Auxin Levels in Plant Root Development

Cited by 139 publications

References 294 publications

Micropropagation and Establishment of Humulus lupulus L. Plantlets Under Field Conditions at Southern Brazil

Micropropagation and Establishment of Humulus lupulus L. Plantlets Under Field Conditions at Southern Brazil

The Roles of Auxin Biosynthesis YUCCA Gene Family in Plants

The Role of the Primary Cell Wall in Plant Morphogenesis

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