EVALUATION OF RELATIONSHIP BETWEEN MOISTURE LOSS IN GRAPES AND CHLOROPHYLL FLUORESCENCE MEASURED AS F0 (F-α) READING

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RAMIN A.A.; PRANGE R.K.; DELONG J.M.; HARRISON P.A.

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Paper Information

Journal: JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST) Year:2008 | Volume:10 | Issue:5 Page(s): 471-479

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Title

EVALUATION OF RELATIONSHIP BETWEEN MOISTURE LOSS IN GRAPES AND CHLOROPHYLL FLUORESCENCE MEASURED AS F0 (F-α) READING

Author(s)

RAMIN A.A. | PRANGE R.K. | DELONG J.M. | HARRISON P.A. | Issue Writer Certificate

Keywords

CHLOROPHYLL FLUORESCENCE

POSTHARVEST

VITIS VINIFERA L.

WEIGHT LOSS

Abstract

CHLOROPHYLL FLUORESCENCE was studied as a rapid technique to detect WEIGHT LOSS of table grape cultivars "Thompson and Flame seedless" under air storage conditions (20°C) and in a 0°C cold room. Grape clumps (ca. 1kg) were divided into 12 groups (six for each cultivar) and initial fresh weight, soluble solid content, titratable acidity, pH and color values were recorded. Three groups were placed inside ventilated baskets with a Harvest Watch sensor facing down on the grapes and placed in a 20°C room in front of a forced air fan. These samples were used to generate continuous recording of F-a. The other groups were handled in a similar manner and were used to generate WEIGHT LOSS. The control treatments were held in a 0°C cold room and constantly measured by a Harvest Watch sensor. F-a (F0) ratio curve for Thompson generally declined over times, and the rate of reduction was maximal between days 1 and 6 which is equal to ca. 20 percent in WEIGHT LOSS. The response for Flame grapes was almost the same as for the Thompson cultivar. There were good relationships between F-a values and WEIGHT LOSS values for both cultivars. From these relationships it appears that, for both cultivars, at about 20% WEIGHT LOSS (equal to 0.8 WEIGHT LOSS ratio), the F-a value stopped its decline. The other fruit quality such as SSC, TA, pH and color value indicated that the drying treatment affected these responses, compared with the fruit in the control treatment. Our results indicated that CHLOROPHYLL FLUORESCENCE techniques can detect WEIGHT LOSS in grapes after harvest, and thus has a potential as a rapid and non-destructive method for monitoring fruit WEIGHT LOSS and senescence in grape during storage.

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