Single and joint effect of the basal region of chromosome 2 and centromeric region of chromosome 8 on morphological and fruit quality traits in tomato


The goal of this study was to estimate the single and joint effect of the basal region of chromosome 2 and centromeric region of chromosome 8 on morphological and fruit quality traits in tomato (Solanum lycopersicum). The analysis was performed in a population derived from a cross between Rio Grande of S. lycopersicum and LA1589 of S. pimpinellifolium that segregates for both genomic regions. Four major QTLs were found on chromosome 2 and three on chromosome 8, all of them related with morphological traits. QTLs for fruit shape index, proximal fruit end angle and distal fruit end protrusion showed epistatic interaction. Both genomic regions (fs2.1 and fs8.1) explained 62, 47 and 46 % of the phenotypic variability for fruit shape index, proximal fruit end angle and distal fruit end protrusion respectively. Minor QTLs were detected for other morphological and quality traits such as color, pH and fruit shelf life on chromosomes 2 and 8. Only single genomic region effects were found for quality trait. On the other hand, fs2.1 and fs8.1 regions control several fruit morphology attributes following a digenic linear additive model with epistatic interactions.

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Fig. 1
Fig. 2
Fig. 3
Fig. 4


a/b :

Color chroma index


Analysis of variance

ar :

Fruit area

BC1 :

First cycle of backcross


Cleaved amplified polymorphic sequences

dan20 :

Distal fruit end angle

dblk20 :

Distal fruit end blockiness

f :


F3 :

Third filial generation

fs I :

Fruit shape index

fw :

Fruit mass

H2 :

Broad sense heritability



L :

Lightness color parameter


Homozygous for Rio Grande alleles



pan20 :

Proximal fruit end angle

pblk20 :

Proximal fruit end blockiness

pH :

Hydrogen potential


Homozygous for LA1589 alleles


Quantitative trait loci

S1 :

First selfed generation

sl :

Fruit shelf life

ssc :

Soluble solid content

ta :

Titratable acidity

tip :

Distal fruit end protrusion

tri20 :

Fruit shape triangle


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Correspondence to Gustavo Rubén Rodríguez.

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Supplementary material 1 (JPEG 293 kb) Box plot for the markers with significant association and the highest % R2 in the one-way ANOVA for fruit area (ar), fruit shape index I (fs I), proximal fruit end angle (pan20, in °), dital fruit end angle (dan20, in °), and distal fruit end protrusion (tip). Abbreviations: ma ar, m fsI, m pan20, m dan20, and m tip indicates the average values of the population for each trait. a ar_fs2.1, a ar_fs8.1, a fsI_fs2.1, a fsI_fs8.1, a pan20_fs2.1, a pan20_fs8.1, a dan20_fs2.1, a dan20_fs8.1, a tip_fs2.1, and a tip_fs8.1 indicates de additive value for each trait at the genomic regions fs2.1 and f8.1 respectively. LL: homozygous for Rio Grande alleles, LP: heterozygous, PP: homozygous for LA1589 alleles

Supplementary material 2 (DOCX 17 kb)

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Green, G.Y., Pereira da Costa, J.H., Cambiaso, V. et al. Single and joint effect of the basal region of chromosome 2 and centromeric region of chromosome 8 on morphological and fruit quality traits in tomato. Euphytica 210, 327–339 (2016).

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  • Epistasis
  • Fruit color
  • Fruit shape
  • fs2.1
  • fs8.1
  • Titratable acidity