Catalase in the Heat-Induced Chilling Tolerance of Cold-Stored Hybrid Fortune Mandarin Fruits
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- 作者：José ; M. Sala and Maria T. Lafuente
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：1999
- 出版时间：June 1999
- 年：1999
- 卷：47
- 期：6
- 页码：2410 - 2414
- 全文大小：54K
- 年卷期：v.47,no.6(June 1999)
- ISSN：1520-5118
文摘
Hybrid Fortune mandarins developed chilling injury (CI) upon cold storage, unless the fruits wereconditioned at 37 
C for 3 days before they were held at low temperature. This heat treatmentinduced 2.5-, 1.2-, and 1.4-fold increases in the activities of catalase (CAT), ascorbate peroxidase(APX), and superoxide dismutase (SOD), respectively, and reduced the activity of glutathionereductase (GR). The differences in the activities afforded by the heat treatment were, in general,maintained during cold storage. However, SOD levels in nonconditioned Fortune fruits exhibitingCI were similar to those of conditioned fruits stored for 0 or 6 weeks at 2 C. No difference betweenAPX activity in the conditioned and nonconditioned fruits stored for 6 weeks at 2 C was found.The data indicate that CAT may be a major antioxidant enzyme operating in the heat-induced chillingtolerance of cold-stored Fortune mandarin fruits.Keywords: Ascorbate peroxidase; catalase; citrus; chilling injury; Fortune mandarin; glutathionereductase; high-temperature conditioning; hydrogen peroxide; superoxide dismutase
C for 3 days before they were held at low temperature. This heat treatmentinduced 2.5-, 1.2-, and 1.4-fold increases in the activities of catalase (CAT), ascorbate peroxidase(APX), and superoxide dismutase (SOD), respectively, and reduced the activity of glutathionereductase (GR). The differences in the activities afforded by the heat treatment were, in general,maintained during cold storage. However, SOD levels in nonconditioned Fortune fruits exhibitingCI were similar to those of conditioned fruits stored for 0 or 6 weeks at 2 C. No difference betweenAPX activity in the conditioned and nonconditioned fruits stored for 6 weeks at 2 C was found.The data indicate that CAT may be a major antioxidant enzyme operating in the heat-induced chillingtolerance of cold-stored Fortune mandarin fruits.Keywords: Ascorbate peroxidase; catalase; citrus; chilling injury; Fortune mandarin; glutathionereductase; high-temperature conditioning; hydrogen peroxide; superoxide dismutase