Relationships between fruit exocarp antioxidants in the tomato (Lycopersicon esculentum) high pigment-1 mutant during development.

摘要: Development-dependent changes in fruit antioxidants were examined the exocarp (epidermal and hypodermal tissues) of monogenic recessive tomato (Lycopersicon esculentum L.) mutant high pigment (hp-1) its wild-type parent 'Rutgers' grown under non-stress conditions a greenhouse. The hp-1 was chosen for this study because reportedly higher lycopene ascorbic acid (AsA) contents may alter tolerance to photooxidative stress. Throughout most development, reduced AsA concentrations 1.5 2.0 times than 'Rutgers', but total glutathione similar both genotypes. Only ripe red lower 'Rutgers'. redox ratios (reduced : + oxidized) exocarps usually > 0.9, however, ratio throughout development. Lycopene about 5 Large increases specific enzyme activities superoxide dismutase (EC 1.15.1.1), ascorbate peroxidase 1.11.1.11), monodehydroascorbate reductase (MDHAR; EC 1.6.5.4) occurred during development genotypes, with an inverse relationship between these enzymes chlorophyll content. Glutathione 1.6.4.2) MDHAR-specific only at later stages Dehydroascorbate 1.8.5.1) activities, 'Rugters' hp-1. Catalase (CAT, 1.11.1.6) increased until orange/light red, when CAT hp-1, then declined These results suggest that elevated early increase injury time, increasing antioxidant appear be developmentally associated ripening.