Genetic analysis of organoleptic quality in fresh market tomato. 1. Mapping QTLs for physical and chemical traits

Citation
V. Saliba-colombani et al., Genetic analysis of organoleptic quality in fresh market tomato. 1. Mapping QTLs for physical and chemical traits, THEOR A GEN, 102(2-3), 2001, pp. 259-272
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
THEORETICAL AND APPLIED GENETICS
ISSN journal
0040-5752 → ACNP
Volume
102
Issue
2-3
Year of publication
2001
Pages
259 - 272
Database
ISI
SICI code
0040-5752(200102)102:2-3<259:GAOOQI>2.0.ZU;2-F
Abstract
Improving organoleptic quality is an important but complex goal for fresh m arket tomato breeders. A total of 26 traits involved in organoleptic qualit y variation were evaluated, in order to understand the genetic control of t his characteristic. A recombinant inbred line (RIL) population was develope d from an intraspecific cross between a cherry tomato line with a good over all aroma intensity and an inbred line with a common taste but with bigger fruits. Physical traits included fruit weight, diameter, color (L,a,b), fir mness and elasticity. Chemical traits were dry matter weight, titratable ac idity, pH, and the contents of soluble solids, sugars, lycopene, carotene a nd 12 aroma volatiles. RILs showed a large range of variation for most of t he traits and many of them were transgressive. Some correlations between ar oma volatiles were in accordance with the metabolic pathway they originated from. A total of 81 significant QTLs were detected for the 26 traits by si mple and composite interval mapping. They were mainly distributed in a few regions on chromosomes 2, 3, 4, 8, 9, 11 and 12. Major QTLs (R-2>30%) were detected for fruit weight, diameter, and color, and for six aroma volatiles . Go-localization of QTLs controlling correlated traits was mainly found on chromosome 2. QTLs for fruit weight and sugar content or dry matter weight were often co-localized. However, a QTL for soluble-solids content and dry matter weight have been detected on chromosome 9 in a region without fruit weight QTLs. QTLs for seven aroma volatiles, lycopene content and fruit co lor were also co-localized. The QTL localizations were compared with those detected in crosses between Lycopersicon esculentum and wild tomato species .