Quantitative trait locus mapping associated with earliness and fruit weight in tomato

Authors

  • Aurelio Hernández-Bautista College of Postgraduate; Dept. of Genetic Resources and Productivity-Genetics
  • Ricardo Lobato-Ortiz College of Postgraduate; Dept. of Genetic Resources and Productivity-Genetics
  • José Jesús García-Zavala College of Postgraduate; Dept. of Genetic Resources and Productivity-Genetics
  • Fernando López-Fortoso Autonomous University of Puebla; School of Biology, Blvd
  • Serafín Cruz-Izquierdo College of Postgraduate; Dept. of Genetic Resources and Productivity-Genetics
  • José Luis Chávez-Servia CIIDIR; National Polytechnic Institute
  • Marisol Cadeza-Espinosa College of Postgraduate; Dept. of Socioeconomics – Statistics and Informatics

DOI:

https://doi.org/10.1590/0103-9016-2015-0245

Abstract

The flowering time is regarded as an important factor that affects yield in various crops. In order to understand how the molecular basis controlling main components of earliness in tomato (Solanum lycopersicum L.), and to deduce whether the correlation between fruit weight, days to flowering and seed weight, is caused by pleiotropic effects or genetic linkage, a QTLs analysis was carried out using an F2 interspecific population derived from the cross of S. lycopersicum and S. pimpinellifolium. The analysis revealed that most of the components related to earliness were independent due to the absence of phenotypic correlation and lack of co-localization of their QTLs. QTLs affecting the flowering time showed considerable variation over time in values of explained phenotypic variation and average effects, which suggested dominance becomes more evident over time. The path analysis showed that traits such as days to flowering, seed weight, and length of the first leaf had a significant effect on the expression of fruit weight, confirming that their correlations were due to linkage. This result was also confirmed in two genomic regions located on chromosomes 1 and 4, where despite showing high co-localization of QTLs associated to days to flowering, seed weight and fruit weight, the presence and absence of epistasis in dfft1.1 × dftt4.1 and fw1.1 × fw4.1, suggested that the linkage was the main cause of the co-localization.

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Published

2016-10-01

How to Cite

Hernández-Bautista, A., Lobato-Ortiz, R., García-Zavala, J. J., López-Fortoso, F., Cruz-Izquierdo, S., Chávez-Servia, J. L., & Cadeza-Espinosa, M. (2016). Quantitative trait locus mapping associated with earliness and fruit weight in tomato . Scientia Agricola, 73(5), 478-486. https://doi.org/10.1590/0103-9016-2015-0245

Issue

Section

Genetics and Plant Breeding