H2-SH-7-D flender rohr Helical speed reduction gearbox H2

Flender/Flender Gear Units/Helical speed reduction gearbox H2

). 4.3.3 CA StorageThe principles of CA storage and MA packaging have already been presented earlier in the respiration section of this chapter. With our current knowledge of ethylene physiology, it is apparent that CA storage provides the optimum conditions that reduce both ethyleneproduction (low and ethylene action (high CO 2, low temperature). CA storage can reduce ethylene biosynthesis by its effects on both ACC synthase and ACC oxidase. LowO 2and/or elevated CO 2reduce ethylene biosynthesis in Golden Delicious apples by Postharvest Physiology of Fresh Produce 4 delaying and suppressing expression of ACC synthase at the transcriptional level and by reducing the abundance of active ACC oxidase protein (. Ethylene action can alsobe suppressed by low temperature and elevated CO 2(. The possibility that CA storage would be more benecial if ethylene was not present has been studied with mixed results. It appears that ethylene removal may be benecial only when the ethylene concentration can be kept below physiological levels of 1 LL/H1 or less (. It has also been suggested that there is virtually no benet to ethylene scrub- bing in low-oxygen CA storage (1 kPa, rather than 3 to 5 kPa) due to the lower rate ofethylene production and ethylene concentration within the fruit in the presence of 1 kPaO 2or less (. However, ethylene scrubbing improves rmness retention in Elstar apples stored in 1.2 kPa 2(ULO), compared with ULO with no ethylene scrubbing (. Most of the research on ethylene scrubbing in CA conditions has been done on apples and it is not certain that other commodities would respond similarly. 4.4 Ethylene Addition In some circumstances, ethylene is intentionally added to the stored product to accelerate some of the plant processes it controls. Various published summaries should be consulted for more details on treatment and safety procedures (see 1,. The concentration of ethylene and treatment duration to achieve the desired effect will vary