Cited by 305Plant Molecular Biology ResearchPlant nutrient uptake and metabolismPlant tissue culture and regeneration

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Conditional transgenic expression of the ipt gene indicates a function for cytokinins in paracrine signaling in whole tobacco plants

Faiss, Martin, Zalubìlová, Jana, Strnad, Miroslav, Schmülling, Thomas·1997·The Plant Journal

DOI 10.1046/j.1365-313x.1997.12020401.x

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Abstract

This study investigated whether an increased production of the plant hormone cytokinin in roots, the main site of its synthesis and putative signaling organ, can influence developmental events, such as growth of axillary shoot meristems or leaf senescence, in the plant shoot. To this end, transgenic tobacco plants (Nicotiana tabacum L.) were generated that conditionally overproduce cytokinins. These plants harbour the ipt gene under the transcriptional control of a modified 35S promoter that is repressed in plants with high titers of tetracycline repressor protein. De‐repression of transcription led to a rapid more than 50‐ fold increase of hormone concentration. The time course of changes in the steady‐state levels of 16 different cytokinin metabolites, as a consequence of IPT enzyme activity, was monitored in different plant tissues. Zeatin riboside was the first and most dramatically increased product; zeatin, dihydrozeatin and glucosides accumulated later. The consequences of enhanced cytokinin synthesis remained mainly restricted to the site of hormone production. For example, de‐repression of ipt gene transcription in lateral buds caused the growth of single buds only at the site of tetracycline application. In reciprocal grafts of transgenic plants with wild‐type plants, no biological cytokinin effects, i.e. growth of lateral shoot meristems or sequential leaf senescence, were observed in the non‐transgenic plant part. Also, the increase in steady‐state levels of cytokinins remained restricted mainly to the transgenic part, despite a specific increase of the zeatin riboside concentration in the transpiration stream. These results question the role of cytokinins as a long‐range root‐to‐shoot signal in correlative control of apical dominance and sequential leaf senescence of tobacco, and support the assumption that this hormone is relevant to paracrine signaling.

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Crossref · 10.1046/j.1365-313x.1997.12020401.x

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Authors: Faiss, M., Zalubìlová, J., Strnad, M., & Schmülling, T.
Affiliations: University of Tübingen (DE)
Czech Academy of Sciences, Institute of Experimental Botany (CZ)
Corresponding author: Schmülling, Thomas
ORCID: Strnad, Miroslav
Schmülling, Thomas
Venue: The Plant Journal
Publisher: Wiley
Published: 1997-08
Volume: 12
Issue: 2
Pages: 401-415
ISSN: 0960-7412 (ISSN-L)
1365-313X
DOI: 10.1046/j.1365-313x.1997.12020401.x
OpenAlex: W2010254904
Cited by: 305
References: 0
Citations by year: 2025: 1 · 2024: 4 · 2023: 7 · 2022: 6 · 2021: 6 · 2020: 7 · 2019: 4 · 2018: 10 · 2017: 8 · 2016: 3 · 2015: 11 · 2014: 8 · 2013: 12 · 2012: 18
FWCI: 9.59
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 1677 d)
Locations: The Plant Journal (publishedVersion)
PubMed (publishedVersion)
Topics: Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant tissue culture and regeneration
Keywords: cytokinins, ipt gene, paracrine signaling, transgenic tobacco, conditional gene expression, TetR, zeatin riboside, root-to-shoot signaling, apical dominance, leaf senescence, grafting, transpiration stream, tobacco
MeSH terms: Aging, Cytokinins, Kinetics, Plants, Toxic, Recombinant Fusion Proteins, Repressor Proteins, Nicotiana, Transcription, Genetic, Zeatin, Signal Transduction, Genes, Plant, Gene Expression Regulation, Plant, Plant Leaves, Plant Roots, Meristem, Plant Shoots, Plants, Genetically Modified

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Conditional transgenic expression of the ipt gene indicates a function for cytokinins in paracrine signaling in whole tobacco plants

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