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Fan L.,Chinese Academy of Agricultural Sciences | Fan L.,Agriculture and Agri Food Canada | Fan L.,Key Laboratory of Fruit Germplasm Resources Utilization | Yu C.,Chinese Academy of Agricultural Sciences | And 5 more authors.
Canadian Journal of Plant Science | Year: 2011

The effects of two production systems, plastic mulch (PM) and plastic mulch with row covers (PMRC) versus the commonly used matted-row system (MRS) on postharvest fruit quality, including shelf life, fruit weight loss and juice leakage, fruit glossiness, postharvest disease caused by grey mould (Botrytis cinerea Pers.), and chemical composition of Orlé ans strawberry were evaluated during 2008 and 2009. Plastic mulch with row covers accelerated fruit maturity by 7 to 10 d and produced larger fruits compared with the MRS. Production systems significantly changed the total phenolic content (TPC) and total antioxidant content (TAC), but the effect varied during the harvest season. Total phenolic content was significantly higher for PMRC than MRS and PM at early harvest, but the effect was similar to PM at mid and late harvest. Total antioxidant content was significantly higher for PMRC compared with MRS and PM at all stages of fruit production, especially at late harvest. Fruit weight loss and juice leakage and the presence of grey mould during storage were lower and fruit glossiness was higher for those harvested under PMRC compared with those from MRS. No significant differences were observed for firmness, pH, titratable acidity (TA) and soluble solids content (SSC) between the three production systems. Titratable acidity and SSC of PMRC were slightly higher than those from MRS and PM, but the differences were not significant. It seems that PMRC not only accelerates ripening, but also has a significant effect on preand postharvest fruit quality and chemical composition of the harvested fruits. Source

Wang X.-D.,Key Laboratory of Fruit Germplasm Resources Utilization | Wang X.-D.,Chinese Academy of Agricultural Sciences | Wang H.-B.,Key Laboratory of Fruit Germplasm Resources Utilization | Wang H.-B.,Chinese Academy of Agricultural Sciences | And 8 more authors.
Chinese Journal of Applied Ecology | Year: 2010

Taking the 6-year old peach "Shuguang" as test object, this paper studied the effects of short-term heating at 40 °C , 45 °C , and 50°C on the bud livability, bud burst, reactive oxygen content, and activities of related enzymes in peach bud, aimed to investigate the regulation effect of short-term heating on the endodormancy release of peach bud. The results indicated that the effects of short-tern heating on the endodormancy release of peach bud were advanced by the postponement of treatment date, the increase of treatment temperature, and the prolonging of treatment time. On November 30, the regulation effect of heating at 40°C was negative. Comparing with those under no-heating (CK) , the date of endodormancy release was postponed, the bud burst, the O 2 - and · OH production rates, the H 2O 2 content, and the activities of CAT and POD were lowered, and the SOD activity was improved. It was adverse under heating at 45°C and 50°C.. On December 10, heating at 40 °C nearly had no obvious effect on the endodormancy release, while heating at 45 °C and 50°C had the same effect as that on November 30, with the former being more superior to the latter. Correlation analysis indicated that the rapid increase of reactive oxygen might be the critical reason for the endodormancy release of peach bud. Source

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