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S.R. Drake, D.C. Elfving, M.A. Drake, T.A. Eisele, S.L. Drake, and D.B. Visser

This study was conducted over two crop seasons using `Scarletspur Delicious' and `Gale Gala' apple trees (Malus ×domestica). The bioregulators aminoethoxyvinylglycine (AVG), ethephon (ETH), and 1-methylcyclopropene (MCP) were applied at various times before or after harvest. Fruit response was evaluated at harvest and after regular atmosphere (RA) and controlled atmosphere (CA) storage [2.0% oxygen (O2) and <2.0% carbon dioxide (CO2) at 0 °C] and quality of whole and juice apple products evaluated. AVG reduced starch loss and ethylene production, enhanced firmness, and reduced cracking in `Gale Gala,' but reduced sensory acceptance of apples and apple juice. ETH intensified starch loss, ethylene production, and reduced firmness, but did not affect `Gale Gala' fruit cracking. AVG followed by ETH reduced starch loss, ethylene production, and cracking and maintained firmness. This combination also aided in sensory acceptance of apples but reduced sensory preference of apple juice. Exposure to postharvest MCP improved flesh firmness retention and reduced ethylene production after both RA and CA storage. MCP either favored or reduced sensory acceptance of whole apples, depending on the particular season, but reduced sensory preference of apple juice. Sensory scores for `Scarletspur Delicious' apples were more strongly modified by bioregulators than were `Gale Gala' apples.

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Aref A. Abdul-Baki and Theophanes Solomos

The diffusion coefficient of CO2 in `Russet Burbank' potato (Solanum tuberosum L.) tubers was determined under steady-state conditions at 10 and 27C. The data showed that the skin is the main barrier to gas diffusion, with an average diffusion coefficient of 6.57 × 10-7 and 7.61 × 10-7 cm·s-1 at 10 and 27C, respectively. The flesh also presents an appreciable barrier to gas diffusion. The average diffusion coefficient of CO2 in the flesh was 2.00 × 10-4 and 2.24 × 10-4 cm·s-1 at 10 and 27C, respectively. Under regular storage conditions, the tuber is well aerated and the concentration of O2 at the center of the tuber is sufficient to maintain aerobic respiration.

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Esmaeil Fallahi, Bahar Fallahi, Bahman Shafii, and Zabihollah Zamani

calculated. Twenty of these fruit were used for evaluation of quality attributes at harvest and 15 were kept in perforated plastics bags and stored in a regular storage at 0 o C and 90% relative humidity for 5 months. For quality evaluation, we harvested all

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Timothy W. Coolong and William M. Randle

atmosphere and regular storage-induced changes in S -alk(en)yl cysteine-L-sulfoxides and alliinase activity in onion bulbs ( Allium cepa L., cv. Hysam) Postharvest Biol. Technol. 28 239 245 Uzo, J.O. Currah, L. 1990

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Ksenija Gasic, John E. Preece, and David Karp

, 5.5 g/L malic acid; keeps 6 months in regular storage; ripens mid- to late-season in British Columbia. Tree: blooms early to mid-May in British Columbia; vigor moderate; growth habit spreading; hardy to USDA Zone 4. TCL3. Early ripening