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Article

Genetic Analysis of Root-to-Shoot Signaling and Rootstock-Mediated Tolerance to Water Deficit in Tomato

1
Instituto Valenciano de Investigaciones Agrarias, Carretera de Moncada a Náquera Km 4.5, Apartado Oficial, 46113 Moncada, Valencia, Spain
2
CEBAS, CSIC, Campus de Espinardo, 30100 Espinardo, Murcia, Spain
3
Faculty of Agriculture, University of Cukurova, 01330 Adana, Turkey
4
The Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YW, UK
*
Author to whom correspondence should be addressed.
Genes 2021, 12(1), 10; https://doi.org/10.3390/genes12010010
Received: 12 November 2020 / Revised: 15 December 2020 / Accepted: 19 December 2020 / Published: 23 December 2020
(This article belongs to the Special Issue Tomato Genetics)
Developing drought-tolerant crops is an important strategy to mitigate climate change impacts. Modulating root system function provides opportunities to improve crop yield under biotic and abiotic stresses. With this aim, a commercial hybrid tomato variety was grafted on a genotyped population of 123 recombinant inbred lines (RILs) derived from Solanum pimpinellifolium, and compared with self- and non-grafted controls, under contrasting watering treatments (100% vs. 70% of crop evapotranspiration). Drought tolerance was genetically analyzed for vegetative and flowering traits, and root xylem sap phytohormone and nutrient composition. Under water deficit, around 25% of RILs conferred larger total shoot dry weight than controls. Reproductive and vegetative traits under water deficit were highly and positively correlated to the shoot water content. This association was genetically supported by linkage of quantitative trait loci (QTL) controlling these traits within four genomic regions. From a total of 83 significant QTLs, most were irrigation-regime specific. The gene contents of 8 out of 12 genomic regions containing 46 QTLs were found significantly enriched at certain GO terms and some candidate genes from diverse gene families were identified. Thus, grafting commercial varieties onto selected rootstocks derived from S. pimpinellifolium provides a viable strategy to enhance drought tolerance in tomato. View Full-Text
Keywords: drought; QTL analysis; candidate genes; cytokinins; manganese; transcription factors; MAPKKK cascade; S. pimpinellifolium; rootstock breeding drought; QTL analysis; candidate genes; cytokinins; manganese; transcription factors; MAPKKK cascade; S. pimpinellifolium; rootstock breeding
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MDPI and ACS Style

Asins, M.J.; Albacete, A.; Martínez-Andújar, C.; Celiktopuz, E.; Solmaz, İ.; Sarı, N.; Pérez-Alfocea, F.; Dodd, I.C.; Carbonell, E.A.; Topcu, S. Genetic Analysis of Root-to-Shoot Signaling and Rootstock-Mediated Tolerance to Water Deficit in Tomato. Genes 2021, 12, 10. https://doi.org/10.3390/genes12010010

AMA Style

Asins MJ, Albacete A, Martínez-Andújar C, Celiktopuz E, Solmaz İ, Sarı N, Pérez-Alfocea F, Dodd IC, Carbonell EA, Topcu S. Genetic Analysis of Root-to-Shoot Signaling and Rootstock-Mediated Tolerance to Water Deficit in Tomato. Genes. 2021; 12(1):10. https://doi.org/10.3390/genes12010010

Chicago/Turabian Style

Asins, Maria J., Alfonso Albacete, Cristina Martínez-Andújar, Eser Celiktopuz, İlknur Solmaz, Nebahat Sarı, Francisco Pérez-Alfocea, Ian C. Dodd, Emilio A. Carbonell, and Sevilay Topcu. 2021. "Genetic Analysis of Root-to-Shoot Signaling and Rootstock-Mediated Tolerance to Water Deficit in Tomato" Genes 12, no. 1: 10. https://doi.org/10.3390/genes12010010

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