CA-storage related disorders in Conference pears.
Streif, J., Xuan, H., Saquet, A. A. and Rabus, C.
ISHS Acta Horticulturae 553: 2001. pp. 635-638.
2001
บทคัดย่อ
The main controlled atmosphere (CA) storage problems of 'Conference' pear are the browning of tissue around the core and the formation of cavities. The causes for the occurrence of these disorders are very complex and comprise pre- and postharvest conditions such as mineral nutrition, crop load, picking date and storage conditions. Fruits of 'Conference' pear with variations in mineral application and picking date were stored under CA conditions with high (5%) and low (0.7%) CO2 combined with 2% O2. The incidence of flesh browning and cavities were judged several times during 6 months of storage. According to our results, no relationship exists between these disorders and the macronutrients K, Ca, Mg and P, but the micronutrient B seems to be strongly related to occurrence of browning. Late picking, as well as high CO2 concentrations in the storage atmosphere, have a very obvious promoting effect on the appearance and intensity of the browning disorder. Possible causes for the disorders are: (1) that the increase in respiration, and/or the change in texture of riper fruits, results in detrimental CO2/O2 concentrations in the inner part of the fruit tissue; (2) that B plays an important role in maintaining structure and functioning of cell membranes; (3) that a living tissue needs a continuous supply of energy to maintain the integrity of cells and that the production of ATP is reduced under CA conditions; and (4) that the endogenous defence mechanism of cells against stress is exhausted very soon under extreme high CO2 and low O2 concentrations.