ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Influence of preharvest water stress on postharvest moisture loss of carrots (Daucus carota L.).

Shibairo, S. I.; Upadhyaya, M. K.; Toivonen, P. M. A.;

Journal of Horticultural Science and Biotechnology Year: 1998 Vol: 73 Issue: 3 Pages: 347-352 Ref: 23 ref.

1998

บทคัดย่อ

Carrot cultivars Eagle and Paramount were grown in muck soil in 6-litre pots (8 carrots/pot) in a greenhouse at the University of British Columbia, Vancouver, Canada. The plants were watered to field capacity every second day for 5.5 months prior to exposure to 100 (low), 75 (medium), 50 (high) or 25% (severe stress) field capacity water stress treatments for 4.5 weeks. Postharvest moisture loss of carrots stored at 13 deg C with 32% RH was monitored every second day for 3 weeks. The percentage moisture loss was low in the least stressed carrots, and was high in the severely stressed carrots of both cultivars. Root crown diameter, weight, and water and osmotic potentials decreased, whereas specific surface area and relative solute leakage increased, with increasing preharvest water stress. It is suggested that carrots adjust to water stress by lowering water and osmotic potentials. Root water potential, followed by relative solute leakage, were the variables which accounted for most of the varia

tion in moisture loss. It is suggested that preharvest water stress lowers membrane integrity of carrot roots, and this may enhance moisture loss during storage.