Abstract
Auxins regulate several characteristics of plant development and growth. Here, we characterized a new transcriptional activator SIARRI which binds specific DNA sequences and was revealed in Arabidopsis (ARR1). SIARRI acts as a two-component response regulator and its Arabidopsis homologous gene is AT3G16857. It belongs to the subfamily of type-B response regulators in the cytokinin signaling pathway. The study aimed to characterize the transgenic Micro-Tom plants by the overexpression of Solanum lycopersicum two-component response regulator ARR1. Overexpression of SIARRI results in a pleiotropic phenotype during fruit development and ripening. This study indicates that SIARRI is a primary regulator of leaf morphology and fruit development. Moreover, overexpressed plants showed variations in growth related to auxin as well as shorter hypocotyl elongation, enlarged leaf vascularization, and decreased apical dominance. The qRT-PCR investigation revealed that expression was downregulated at the breaker stage and high at Br+6 at various stages of fruit growth and ripening. In contrast to the fruit color, lycopene and β-carotene concentrations in red-yellow overexpression line fruits were reduced significantly, and also slightly reduced in some red fruits. The quantity of β-carotene in the transgenic fruits was lower than that of lycopene. This study showed that this gene might be a new transcriptional activator in fruit development and ripening. Furthermore, this study will provide new insights into tomato fruit ripening.
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MF conducted the experiment, MTA, AJ, AB helped in collecting the relevant literature for this study, AB, MF, MMA, WL, MNS, IU and HIM helped in writing the manuscript. All authors have read and approved the final version of the manuscript.
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Fahad, M., Altaf, M.T., Jamil, A. et al. Functional characterization of transcriptional activator gene SIARRI in tomato reveals its role in fruit growth and ripening. Transgenic Res 32, 77–93 (2023). https://doi.org/10.1007/s11248-023-00337-x
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DOI: https://doi.org/10.1007/s11248-023-00337-x