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The parthenocarpic hydra mutant reveals a new function for a SPOROCYTELESS-like gene in the control of fruit set in tomato

By Pilar Rojas-Gracia, Edelin Marta Roque Mesa, Mónica Medina Herranz, Mª Cruz Rochina Peñalver, Rim Hamza, Maria Pilar Angarita-Diaz, Vicente Moreno Ferrero, Fernando Pérez-Martín, Rafael Lozano, Luís Antonio Cañas Clemente, Jose Pio Beltran Porter and María Concepción Gómez Mena

Abstract

[EN] Fruit set is an essential process to ensure successful sexual plant reproduction. The development of the flower into a fruit is actively repressed in the absence of pollination. However, some cultivars from a few species are able to develop seedless fruits overcoming the standard restriction of unpollinated ovaries to growth. We report here the identification of the tomato hydra mutant that produces seedless (parthenocarpic) fruits. Seedless fruit production in hydra plants is linked to the absence of both male and female sporocyte development. The HYDRA gene is therefore essential for the initiation of sporogenesis in tomato. Using positional cloning, virus-induced gene silencing and expression analysis experiments, we identified the HYDRA gene and demonstrated that it encodes the tomato orthologue of SPOROCYTELESS/NOZZLE (SPL/NZZ) of Arabidopsis. We found that the precocious growth of the ovary is associated with changes in the expression of genes involved in gibberellin (GA) metabolism. Our results support the conservation of the function of SPL-like genes in the control of sporogenesis in plants. Moreover, this study uncovers a new function for the tomato SlSPL/HYDRA gene in the control of fruit initiation.This work was supported by grants from the Spanish Ministerio de Ciencia e Innovaci on (MICINN; AGL2009-07617 to C.G-M.; AGL2015-64991-C3-3-R to V.M.; and AGL2015-64991-C3-1-R to R.L.) and the Ram on y Cajal Program (RYC-2007-00627). We thank Rafael Martinez and Primitivo Murias for expert plant care; Marisol Gasc on for technical assistance with the microscope; and Dr Cristina Ferrandiz for critical reading of the manuscript. The authors declare no conflicts of interest.This work was supported by grants from the Spanish Ministerio de Ciencia e Innovaci on (MICINN; AGL2009-07617 to C.G-M.; AGL2015-64991-C3-3-R to V.M.; and AGL2015-64991-C3-1-R to R.L.) and the Ram on y Cajal Program (RYC-2007-00627). We thank Rafael Martinez and Primitivo Murias for expert plant care; Marisol Gasc on for technical assistance with the microscope; and Dr Cristina Ferrandiz for critical reading of the manuscript. The authors declare no conflicts of interest.Rojas-Gracia, P.; Roque Mesa, EM.; Medina Herranz, M.; Rochina Peñalver, MC.; Hamza, R.; Angarita-Diaz, MP.; Moreno Ferrero, V.... (2017). The parthenocarpic hydra mutant reveals a new function for a SPOROCYTELESS-like gene in the control of fruit set in tomato. New Phytologist. 214(3):1198-1212. doi:10.1111/nph.14433S11981212214

Topics: Fruit development, Parthenocarpy, Solanum lycopersicum (tomato), SPOROCYTELESS/NOZZLE, Sporogenesis, GENETICA
Publisher: 'Wiley'
Year: 2017
DOI identifier: 10.1111/nph.14433
OAI identifier: oai:riunet.upv.es:10251/102244
Provided by: RiuNet
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