Strigolactones promote flowering by inducing the miR319- LA - SFT module in tomato.

Autor:	Visentin I; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy., Ferigolo LF; Laboratory of Molecular Genetics of Plant Development, Escola Superior de Agricultura 'Luiz de Queiroz,' University of São Paulo, Piracicaba, São Paulo 13418-900, Brazil., Russo G; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy., Korwin Krukowski P; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy., Capezzali C; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy., Tarkowská D; Laboratory of Growth Regulators, Faculty of Sciences, Palacký University & Institute of Experimental Botany Czech Academy of Sciences, Olomouc CZ 783 71, Czech Republic., Gresta F; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy.; StrigoLab Srl, Turin 10125, Italy., Deva E; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy.; StrigoLab Srl, Turin 10125, Italy., Nogueira FTS; Laboratory of Molecular Genetics of Plant Development, Escola Superior de Agricultura 'Luiz de Queiroz,' University of São Paulo, Piracicaba, São Paulo 13418-900, Brazil., Schubert A; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy., Cardinale F; PlantStressLab, Department of Agricultural, Forest and Food Sciences, Turin University, Grugliasco 10095, Italy.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2024 May 07; Vol. 121 (19), pp. e2316371121. Date of Electronic Publication: 2024 May 03.
DOI:	10.1073/pnas.2316371121
Abstrakt:	Strigolactones are a class of phytohormones with various functions in plant development, stress responses, and in the interaction with (micro)organisms in the rhizosphere. While their effects on vegetative development are well studied, little is known about their role in reproduction. We investigated the effects of genetic and chemical modification of strigolactone levels on the timing and intensity of flowering in tomato ( Solanum lycopersicum L.) and the molecular mechanisms underlying such effects. Results showed that strigolactone levels in the shoot, whether endogenous or exogenous, correlate inversely with the time of anthesis and directly with the number of flowers and the transcript levels of the florigen-encoding gene SINGLE FLOWER TRUSS ( SFT ) in the leaves. Transcript quantifications coupled with metabolite analyses demonstrated that strigolactones promote flowering in tomato by inducing the activation of the microRNA319- LANCEOLATE module in leaves. This, in turn, decreases gibberellin content and increases the transcription of SFT . Several other floral markers and morpho-anatomical features of developmental progression are induced in the apical meristems upon treatment with strigolactones, affecting floral transition and, more markedly, flower development. Thus, strigolactones promote meristem maturation and flower development via the induction of SFT both before and after floral transition, and their effects are blocked in plants expressing a miR319-resistant version of LANCEOLATE . Our study positions strigolactones in the context of the flowering regulation network in a model crop species. Competing Interests: Competing interests statement:The authors declare no competing interest.
Databáze:	MEDLINE
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