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Broad Hormonal Responses Induced by Aluminum in Roots of Dwarf Transgenics of Solanum lycopersicum L. cv “Micro-Tom”

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American Journal of Plant Sciences 2024年第5期15卷 349-358页

作者： Arthur B. Rates Daniela Boanares Daniele S. G. Pianetti Felipe Della-Torre Joni E. lima Marcel G. C. França Department of Botany and Plant Physiology Laboratory Federal University of Minas Gerais Belo Horizonte Brazil

The spatial pattern distribution of plant hormones in response to aluminum (Al) toxicity in roots remains to be shown. This study was performed to assess the root hormonal accumulation and gene expression in response to Al toxicity in five transgenic miniature dwarf tomatoes cv. Micro-Tom (MT). MT and MT transgenics to acid indole acetic, cytokinin, gibberellin, abscisic acid and ethylene were cultivated in nutrient solutions containing different Al concentrations. Root growth elongation was measured and cellular damage was visualized by staining Evans’s blue. The gus reporter gene staining technique was used to visualize hormonal changes in MT apex root tissues. Data indicated that the MT is sensitive to Al that induced significant growth inhibition and cellular damage. Al concentration of 27 μM was significantly toxic, inducing root apex darkening and inhibition of root development. The qualitative evaluation of gus reporter gene expression showed intense crosstalk among all hormones studied, underscoring the complexity of signaling induced by Al in apex roots. Results point out to a major understanding of the hormonal signaling in response to Al toxicity, which may induce a change of root growth and architecture with growth inhibition and cell constraints modulated by all different hormones evaluated.

关键词： Gene Reporter Metal Plant Hormones Root Staining

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Increased branching independent of strigolactone in cytokinin oxidase 2-overexpressing tomato is mediated by reduced auxin transport

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Molecular Horticulture 2022年第1期2卷 153-171页

作者： Lilian Ellen Pino Joni E.lima Mateus H.Vicente Ariadne F.L.de Sá Francisco Pérez-Alfocea Alfonso Albacete Juliana L.Costa TomášWerner Thomas Schmülling Luciano Freschi Antonio Figueira Agustin Zsögön Lázaro E.P.Peres Laboratory of Plant Breeding Centro de Energia Nuclear na AgriculturaUniversity of Sao PauloSão PauloBrazil Laboratory of Hormonal Control of Plant Development Department of Biological SciencesEscola Superior de Agricultura‘Luiz de Queiroz’University of Sao PauloPiracicabaBrazil Botany Department ICBFederal University of Minas GeraisBelo HorizonteBrazil Department of Plant Nutrition CEBAS-CSICCampus Univ.EspinardoMurciaSpain Institute of Biology/Applied Genetics Freie Universität BerlinBerlinGermany Institute of Biology University of GrazSchubertstraße 518010 GrazAustria Biosciences Institute University of Sao PauloSão PauloBrazil Plant Sciences Department Federal University of ViçosaViçosaBrazil

Tomato production is influenced by shoot branching,which is controlled by different *** we produced tomato plants overexpressing the cytokinin-deactivating gene CYTOKININ OXYDASE 2(CKX2).CKX2-overexpressing(CKX2-OE)plants showed an excessive growth of axillary shoots,the opposite phenotype expected for plants with reduced cytokinin content,as evidenced by LC-MS analysis and ARR5-gus *** TCP transcription factor SlBRC1b was downregulated in the axillary buds of CKX2-OE and its excessive branching was dependent on a functional version of the GRAS-family gene LATERAL SUPPRESSOR(LS).Grafting experiments indicated that increased branching in CKX2-OE plants is unlikely to be mediated by root-derived *** CKX2-OE plants with transgenic antisense plants for the strigolactone biosynthesis gene CAROTENOID CLEAVAGE DIOXYGENASE(CCD7-AS)produced an additive phenotype,indicating independent effects of cytokinin and strigolactones on increased *** the other hand,CKX2-OE plants showed reduced polar auxin transport and their bud outgrowth was reduced when combined with auxin ***,CKX2-OE basal buds did not respond to auxin applied in the decapitated *** results suggest that tomato shoot branching depends on a fine-tuning of different hormonal balances and that perturbations in the auxin status could compensate for the reduced cytokinin levels in CKX2-OE plants.

关键词： CKX2 Hormones Plant development Solanum

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