NDLI: Identification of novel quantitative trait loci for increased lycopene content and other fruit quality traits in a tomato recombinant inbred line population

Content Provider	Springer Nature Link
Author	Ashrafi, Hamid Kinkade, Matthew P. Merk, Heather L. Foolad, Majid R.
Copyright Year	2011
Abstract	Epidemiological and clinical studies indicate that a steady dietary intake of bioavailable lycopene, a C$_{40}$ carotenoid and potent natural antioxidant, may be associated with a decreased incidence of prostate cancer in humans. Since fresh tomatoes and processed tomato products represent approximately 85% of the average human’s dietary lycopene intake, the identification of novel genetic factors which regulate high fruit lycopene content in tomato is imperative for the improvement of nutritional quality in this commercially valuable specialty crop. To understand the genetic control of the extraordinarily high fruit lycopene content in an accession (LA2093) of the tomato wild species Solanum pimpinellifolium, a quantitative trait locus (QTL) mapping study was conducted using a recombinant inbred line (RIL) population of a cross between LA2093 and a cultivated tomato (S. lycopersicum) breeding line, NCEBR-1. The parental lines, F1 progeny, and F7-F10 RIL populations were grown in replicated field trials in four successive years and evaluated for lycopene content as well as several other traits, including fruit fresh weight, soluble solids content, pH of puree, and plant maturity. The lycopene content of ripe fruit was estimated using three methods: high-performance liquid chromatography (HPLC), spectrophotometry, and colorimetric assays. Based on these measurements, QTL were identified and compared across generations. Among the QTL identified for lycopene, two QTL, located on chromosomes 7 and 12, had very large effects and were consistent across generations. The genomic intervals in which these two QTL reside do not correspond to known map positions of carotenoid biosynthetic genes, indicating that these QTL may represent novel alleles with potentially important implications for tomato breeding as well as increased understanding of carotenoid accumulation in tomato. Several QTL were also identified for fruit weight, soluble solids content and plant maturity. The potential implications of these results for tomato crop improvement are discussed.
Starting Page	549
Ending Page	567
Page Count	19
File Format	PDF
ISSN	13803743
Journal	Molecular Breeding
Volume Number	30
Issue Number	1
e-ISSN	15729788
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-10-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carotenoids Molecular markers QTL mapping Recombinant inbred lines Solanum lycopersicum Solanum pimpinellifolium Plant Pathology Plant Sciences Biotechnology Plant Genetics & Genomics Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Molecular Biology Biotechnology Agronomy and Crop Science

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