บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Water potential, an easy to measure and sensitive indicator of mechanical and climatic stress during postharvest handling of carrots.

Herppich, W. B.; Mempel, H.; Geyer, M.;

Agri-Food Quality II: quality management of fruits and vegetables - from field to table, Turku, Finland, 22-25 April, 1998. Year: 1999 Pages: 256-260 Ref: 11 ref.

1999

บทคัดย่อ

Water potential, an easy to measure and sensitive indicator of mechanical and climatic stress during postharvest handling of carrots.

 

The rapid and reliable measurement of root water potential was studied in carrots (cv. Nanthya) using a Scholander pressure bomb. The roots were harvested by hand, the leaves were cut off immediately and the roots were stored before use in plastic bags at 16-19 deg C. Dry matter (DM)-related water content was calculated as the difference of root FW and DW, divided by the DM obtained after oven drying. Water potential measurements did not damage or stress the root tissue. After 2 days' storage at 18 deg and 98% RH, carrots used previously for water potential determinations had obtained the same values of root water potential as the untreated controls measured after 2 days. Respiration rates of these samples were not enhanced compared with the controls. The mean water potential was always significantly lower after storage whereas the mean of DM-related water content was not. This discrepancy was due to the variability in size and weight of the carrots used. Water potential decreased exponentially

as water deficit increased. Carrots suffered considerable decrease in water potential after 2 days' storage at room temperature regardless of whether leaves were left on the roots or not, but this was not reflected in tissue water status. Mechanically stressed carrots placed in a stress simulator also showed changes in water potential that could not be resolved by changes in water content.