Cytokinin-Controlled Gradient Distribution of Auxin in Arabidopsis Root Tip

Wu, Lei; Wang, Junli; Li, Xiaofeng; Guo, Guang-Qin

doi:10.3390/ijms22083874

Cited by 6 publications

(3 citation statements)

References 164 publications

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“…It is well known the inhibitory effect of a low auxin-to-CK ratio during wound-induced AR formation in stem cuttings of several species [11]. Recent studies in A. thaliana roots uncovered the molecular mechanisms of CK-mediated auxin gradient refinement [67]. In the primary root, the boundary between proliferating and differentiating cells is controlled by the antagonistic interaction between CKs and the auxin gradient, with CKs contributing to the shaping of this gradient by positioning the auxin minimum through both PAT regulation [68] and local IAA degradation [69].…”

Section: Discussionmentioning

confidence: 99%

Dynamic Hormone Gradients Regulate Wound-Induced de novo Organ Formation in Tomato Hypocotyl Explants

Larriba

Sánchez-García

Justamante

et al. 2021

IJMS

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Plants have a remarkable regenerative capacity, which allows them to survive tissue damage after biotic and abiotic stresses. In this study, we use Solanum lycopersicum ‘Micro-Tom’ explants as a model to investigate wound-induced de novo organ formation, as these explants can regenerate the missing structures without the exogenous application of plant hormones. Here, we performed simultaneous targeted profiling of 22 phytohormone-related metabolites during de novo organ formation and found that endogenous hormone levels dynamically changed after root and shoot excision, according to region-specific patterns. Our results indicate that a defined temporal window of high auxin-to-cytokinin accumulation in the basal region of the explants was required for adventitious root formation and that was dependent on a concerted regulation of polar auxin transport through the hypocotyl, of local induction of auxin biosynthesis, and of local inhibition of auxin degradation. In the apical region, though, a minimum of auxin-to-cytokinin ratio is established shortly after wounding both by decreasing active auxin levels and by draining auxin via its basipetal transport and internalization. Cross-validation with transcriptomic data highlighted the main hormonal gradients involved in wound-induced de novo organ formation in tomato hypocotyl explants.

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Section: Discussionmentioning

confidence: 99%

Dynamic Hormone Gradients Regulate Wound-Induced de novo Organ Formation in Tomato Hypocotyl Explants

Larriba

Sánchez-García

Justamante

et al. 2021

IJMS

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“…Multiple studies have shown that auxin biosynthesis, transport, and accumulation are affected by different nitrogen regimes in maize [ 113 ], Arabidopsis [ 110 ], soybean [ 125 ], and rice [ 126 , 127 ]. Several important auxin-related regulatory modules that respond to nitrogen availability in Arabidopsis have been identified, including TAR2 , a gene involved in auxin biosynthesis, auxin transporters such as PIN1 , PIN2 , PIN4 , and PIN7 , as well as molecular components that control their subcellular distribution [ 128 ]. As an N-responsive gene in the pericycle, AUXIN RESPONSE FACTOR 8 ( ARF8 ) was identified as involved in auxin signaling ( Figure 2 ) [ 129 ].…”

Section: Auxin (Aux) Modulates Rsa In Response To Nitrogen Supplymentioning

confidence: 99%

Insights on Phytohormonal Crosstalk in Plant Response to Nitrogen Stress: A Focus on Plant Root Growth and Development

Ahmad

Jiang

Zhang

et al. 2023

IJMS

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Nitrogen (N) is a vital mineral component that can restrict the growth and development of plants if supplied inappropriately. In order to benefit their growth and development, plants have complex physiological and structural responses to changes in their nitrogen supply. As higher plants have multiple organs with varying functions and nutritional requirements, they coordinate their responses at the whole-plant level based on local and long-distance signaling pathways. It has been suggested that phytohormones are signaling substances in such pathways. The nitrogen signaling pathway is closely associated with phytohormones such as auxin (AUX), abscisic acid (ABA), cytokinins (CKs), ethylene (ETH), brassinosteroid (BR), strigolactones (SLs), jasmonic acid (JA), and salicylic acid (SA). Recent research has shed light on how nitrogen and phytohormones interact to modulate physiology and morphology. This review provides a summary of the research on how phytohormone signaling affects root system architecture (RSA) in response to nitrogen availability. Overall, this review contributes to identifying recent developments in the interaction between phytohormones and N, as well as serving as a foundation for further study.

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“…The cross talk between auxins (Aux) and CK, two key PGR, was found soon after the discovery of CK [ 3 ]. The relationship between Aux and CK, together with other plant growth regulators, promotes and maintains the fine-tuned regulatory functions that control plant growth and development [ 4 , 5 , 6 , 7 ]. This interaction happens at different levels [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Auxin-Cytokinin Cross Talk in Somatic Embryogenesis of Coffea canephora

Avilez-Montalvo

Quintana-Escobar

Méndez-Hernández

et al. 2022

Plants

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Cytokinins (CK) are plant growth regulators involved in multiple physiological processes in plants. One less studied aspect is CK homeostasis (HM). The primary genes related to HM are involved in biosynthesis (IPT), degradation (CKX), and signaling (ARR). This paper demonstrates the effect of auxin (Aux) and CK and their cross talk in a Coffea canephora embryogenic system. The transcriptome and RT-qPCR suggest that Aux in pre-treatment represses biosynthesis, degradation, and signal CK genes. However, in the induction, there is an increase of genes implicated in the CK perception/signal, indicating perhaps, as in other species, Aux is repressing CK, and CK are inducing per se genes involved in its HM. This is reflected in the endogenous concentration of CK; pharmacology experiments helped study the effect of each plant growth regulator in our SE system. We conclude that the Aux–CK balance is crucial to directing somatic embryogenesis in C. canephora.

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Cytokinin-Controlled Gradient Distribution of Auxin in Arabidopsis Root Tip

Cited by 6 publications

References 164 publications

Dynamic Hormone Gradients Regulate Wound-Induced de novo Organ Formation in Tomato Hypocotyl Explants

Dynamic Hormone Gradients Regulate Wound-Induced de novo Organ Formation in Tomato Hypocotyl Explants

Insights on Phytohormonal Crosstalk in Plant Response to Nitrogen Stress: A Focus on Plant Root Growth and Development

Auxin-Cytokinin Cross Talk in Somatic Embryogenesis of Coffea canephora

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