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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 75, No. 4, 2015, pp. 402-409
Bioline Code: cj15054
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 75, No. 4, 2015, pp. 402-409

 en Fruit size QTLs affect in a major proportion the yield in tomato
Hernández-Bautista, Aurelio; Lobato-Ortiz, Ricardo; Cruz-Izquierdo, Serafín; García-Zavala, J. Jesús; Chávez-Servia, José Luis; Hernández-Leal, Enrique & Bonilla-Barrientos, Olga

Abstract

Yield is a complex trait that is affected by several genetic and environmental factors. Yield is defined as the amount of the part of interest that is harvested from a crop plant in a given area. We investigated the genetic basis of yield in an F2 population derived from a cross between Solanum lycopersicum check for this species in other resources L. and its most closely related wild species S. pimpinellifolium check for this species in other resources L. We found that average fruit weight, fruit diameter, and fruit length had a strong effect on yield. In addition, small effects on yield due to soluble solids content and locule number were also observed. A total of 25 different significant quantitative trait locus (QTLs) were detected for six traits (fruit length and diameter, fruit weight, yield, locule number, and Brix degrees). The percentage of phenotypic variation associated with single QTLs ranged from 4.19% to 12.67%. A strong co-location of QTLs among yield and fruit size traits was observed, suggesting that these QTLs play a role in the same expression process controlling yield. We also realized that the effects of soluble solids content on yield could be due to direct effects of fruit size QTLs linked to genes controlling soluble solids content. This result then may suggest that yield in tomato is mainly formed by fruit size QTLs, whereas the remaining factors may play a complementary role in the expression of tomato yield.

Keywords
Fruit size; locule number; QTL; Solanum lycopersicum; soluble solids content; tomato

 
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