ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The influence of a surface coating on the internal gas atmosphere and rate of postharvest rot development in Conference pears.

Bancroft, R. D.;

Acta Horticulturae Year: 2000 Issue: No. 518 Pages: 79-86 Ref: 19 ref.

2000

บทคัดย่อ

Observations of Conference pears held at 20 deg C indicated that within 2 h of application of a 1.5% preparation of the sucrose-ester coating TAL Pro-long the internal gas atmosphere of the fruit was significantly modified. The O2 concentration fell from approximately 14% to less than 2% and, over a period of 18 h, CO2 levels rose from 6% to a peak value between 20 and 24% and ethylene levels declined from 100 ml/litre at the time of coating to 20 ml/litre when the observations ceased. In pears artificially inoculated with the fungal pathogen Monilinia fructigena prior to coating, the transformation of the internal concentrations of O2 and CO2 were followed by distinct changes in the rate of lesion expansion. Some 32 h after treatment and approximately 14 h after the level of CO2 had reached a maximum, significantly lower rates of lesion expansion were observed on coated fruits as opposed to the controls. These results, together with observations of a range of other pathogenic cultures held in v

itro in modified air and a gas atmosphere enriched with CO2, suggest that the ability of the TAL Pro-long treatments to retard the rate of spread of M. fructigena results from a physiological response of the host to the gas environments engendered by the coating and not a direct consequence of elevated CO2 and depressed O2 concentrations of the metabolism of the fungus.