ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

A comparison of preharvest and postharvest ethylene production and respiration rates of saskatoon (Amelanchier alnifolia Nutt.) fruit during development.

Rogiers, S. Y.; Knowles, N. R.;

Canadian Journal of Botany Year: 1999 Vol: 77 Issue: 3 Pages: 323-332 Ref: 29 ref.

1999

บทคัดย่อ

Changes in respiration and ethylene production rates of 9 maturity classes of saskatoon (A. alnifolia) fruits after harvest (held at 23 deg C) were compared with those of fruits maturing and ripening on the plant (in a Canadian orchard). During ripening on the plant, ethylene production increased on a whole-fruit and FW basis, while respiration increased substantially on a whole-fruit basis but remained constant on a FW basis. Fruits harvested at the greenish yellow to pink stages (maturity classes 4 and 5, respectively) increased their ethylene production until 15-20 h after harvest, and this was coincident with ripening to maturity class 7 and thus a colour change to red. Ethylene production then declined over the next 15 h. Respiration rates of harvested immature, mature, and ripe fruits declined over 5 days, except for a relatively brief 8-12% rise starting 15-20 h after harvest. This brief increase in respiration was characteristic of fruits of all maturity classes, likely reflecting a woun

d response associated with harvest rather than a ripening-induced change in metabolism. Continuous treatment of attached or detached fruit with propylene or ethylene in an open airflow system did not induce an increase in respiration earlier, relative to control fruit. The respiratory response of saskatoon fruits during postharvest ripening was thus very different from that of fruits that ripened on the plant. Thus, the increase in respiration associated with ripening could only be demonstrated on a whole-fruit basis if fruits remained on the plant. Preharvest and postharvest changes in ethylene production during ripening also differed but were both consistent with climacteric ripening.