אסיף מאגר המחקר החקלאי

Developmental and varietal differences in volatile ester formation and acetyl-CoA: Alcohol acetyl transferase activities in apple (Malus domestica Borkh.) fruit

Year:

2005

Source of publication :

Authors :

Volume :

53

Co-Authors:

Holland, D., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Larkov, O., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Bar-Ya'akov, I., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Bar, E., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Zax, A., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Brandeis, E., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Ravid, U., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel
Lewinsohn, E., Institute of Field Crops and Horticulture, Agricultural Research Organization, Newe Ya'ar Research Center, P.O Box 1021, Ramat Yishay 30095, Israel

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Abstract:

Apple (Malus domestica Borkh.) cultivars differ in their aroma and composition of volatile acetates in their fruit flesh and peel. Cv. Fuji flesh contains substantial levels of 2-methyl butyl acetate (fruity banana-like odor), while the flesh of cv. Granny Smith apples lacks this compound. Granny Smith apples accumulate mainly hexyl acetate (apple-pear odor) in their peel. Feeding experiments indicated that Fuji apples were able to convert hexanol and 2-methyl butanol to their respective acetate derivatives in vivo, while Granny Smith apples could only convert exogenous hexanol to hexyl acetate. Differential substrate specificities of the in vitro acetyl-CoA:alcohol acetyl transferase (AAT) activities were also detected among cultivars. In Granny Smith apples, the AAT activity was detected only in the peel, and its specificity was almost exclusively restricted to hexanol and cis-3-hexenol. In Fuji apples, the AAT activity was detected in both peel and flesh and apparently accepted a broader range of alcohols as substrates than the Granny Smith enzyme activity. Our data strongly suggest that different AAT activities are operational in apple tissues and cultivars and that these differences contribute to the variation observed in the accumulation of volatile acetates. © 2005 American Chemical Society.

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