INVESTIGADORES
ROUSSEAUX Maria Cecilia
artículos
Título:
QTL analysis of fruit antioxidants in tomato using Lycopersicon pennellii introgression lines
Autor/es:
ROUSSEAUX, M.C; JONES, C.M.; ADAMS, D; CHETELAT, R; BENNETT, A; POWELL, A
Revista:
THEORETICAL AND APPLIED GENETICS
Editorial:
Springer-Verlag
Referencias:
Lugar: Göttingen; Año: 2005 vol. 111 p. 1396 - 1408
ISSN:
0040-5752
Resumen:
Antioxidants present in fruits and vegetables may help prevent some chronic diseases such as cancer, arthritis and heart disease. Tomatoes provide a major contribution to human dietary nutrition because of their widespread consumption in fresh and processed forms. A tomato introgression line population that combines single chromosomal segments introgressed from the wild, green fruited species Lycopersicon pennellii in the background of the domesticated tomato, Lycopersicon esculentum, was used to identify quantitative trait loci (QTL) for nutritional and antioxidant contents. The concentration of ascorbic acid, total phenolics, lycopene and â-carotene, and the total antioxidant capacity of the water-soluble fraction (TACW) were measured in ripe fruit. A total of 20 QTL were identified, including 5 for TACW (ao), 6 for ascorbic acid (aa), and 9 for total phenolics (phe). Some of these QTL (ao6-2, ao6-3, ao7-2, ao10-1, aa12-4, phe6-2, phe7-4) increased levels as compared to the parental line L. esculentum. For lycopene content, we detected 4 QTL, but none increased levels relative to L. esculentum. The two QTL (bc6-2, bc6-3) detected for â-carotene increased its levels. The traits studied displayed a strong environmental interaction as only 35% of the water-soluble antioxidant QTL (including TACW, ascorbic and phenolic contents) were consistent over at least two seasons. Also, only two QTL for phenolics were observed when plants were grown in the greenhouse and none was detected for ascorbic or TACW. The analysis demonstrates that the introgression of wild germplasm may improve the nutritional quality of tomatoes; however regulation appears to be complex with strong environmental effects.