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The relationship between antifungal diene levels and fungal inhibition during quiescent infection of unripe avocado fruits by Colletotrichum gloeosporioides
Year:
1991
Source of publication :
Plant Pathology
Authors :
פרוסקי, דב
;
.
קובילר, אילנה
;
.
Volume :
40
Co-Authors:
PRUSKY, D., Department of Fruit and Vegetable Storage, Agricultural Research Organization, Volcani Center, P.O Box 6, Bet Dagan, 50250, Israel
PLUMBLEY, R.A., Natural Resources Institute, Central Avenue Chatham Maritime, Chatham, United Kingdom
KOBILER, I., Department of Fruit and Vegetable Storage, Agricultural Research Organization, Volcani Center, P.O Box 6, Bet Dagan, 50250, Israel
Facilitators :
From page:
45
To page:
52
(
Total pages:
8
)
Abstract:
Quantitative changes in the antifungal compound, 1‐acetoxy‐2‐hydroxy‐4‐oxo‐heneicosa‐12.15‐diene, in freshly harvested avocado fruits during the initial stages of fungal development were investigated to determine the possible involvement of the compound in quiescent infections of Colletotrichum gloeosporioides. The concentration of the antifungal compound in the peel decreased to subfungitoxic concentrations 16 h after harvest. Fifty‐six hours later the antifungal diene had increased to c. 3800 μg/g fresh weight. At this stage, germinated appressoria had penetrated the cuticle to the epidermal cells but no fungal development was observed until 7 days later when the concentration of the diene had decreased to 100‐110μg/g fresh weight. Following a dip treatment at 55°C for 5 or 10 min, the antifungal diene concentration decreased as in the controls, but it remained at subfungitoxic concentrations for a longer period enabling fungal development and early symptom expression. The concentration of the diene in the flesh of freshly harvested fruit decreased to 120 μg/g fresh weight 24 h after harvest. Inoculation of peeled fruits with spores of C. gloeosporioides showed germination without appressoria formation and symptom expression occurred 24‐48 h later. Symptom expression was delayed if fruits were inoculated after coating the flesh with epicuticular wax extracts or if the flesh was inoculated 3 days after harvest when the antifungal diene had regained a fungitoxic concentration. Disease symptoms were expressed in soft fruits containing subfungitoxic concentrations of the diene. We conclude that the diene in unripe avocado fruits inhibits fungal development of germinated appressoria or conidia. The quiescent structure of C. gloeosporioides in unripe avocado fruit is a subcuticular hypha. Copyright © 1991, Wiley Blackwell. All rights reserved
Note:
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More details
DOI :
10.1111/j.1365-3059.1991.tb02291.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19700
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:30
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Scientific Publication
The relationship between antifungal diene levels and fungal inhibition during quiescent infection of unripe avocado fruits by Colletotrichum gloeosporioides
40
PRUSKY, D., Department of Fruit and Vegetable Storage, Agricultural Research Organization, Volcani Center, P.O Box 6, Bet Dagan, 50250, Israel
PLUMBLEY, R.A., Natural Resources Institute, Central Avenue Chatham Maritime, Chatham, United Kingdom
KOBILER, I., Department of Fruit and Vegetable Storage, Agricultural Research Organization, Volcani Center, P.O Box 6, Bet Dagan, 50250, Israel
The relationship between antifungal diene levels and fungal inhibition during quiescent infection of unripe avocado fruits by Colletotrichum gloeosporioides
Quantitative changes in the antifungal compound, 1‐acetoxy‐2‐hydroxy‐4‐oxo‐heneicosa‐12.15‐diene, in freshly harvested avocado fruits during the initial stages of fungal development were investigated to determine the possible involvement of the compound in quiescent infections of Colletotrichum gloeosporioides. The concentration of the antifungal compound in the peel decreased to subfungitoxic concentrations 16 h after harvest. Fifty‐six hours later the antifungal diene had increased to c. 3800 μg/g fresh weight. At this stage, germinated appressoria had penetrated the cuticle to the epidermal cells but no fungal development was observed until 7 days later when the concentration of the diene had decreased to 100‐110μg/g fresh weight. Following a dip treatment at 55°C for 5 or 10 min, the antifungal diene concentration decreased as in the controls, but it remained at subfungitoxic concentrations for a longer period enabling fungal development and early symptom expression. The concentration of the diene in the flesh of freshly harvested fruit decreased to 120 μg/g fresh weight 24 h after harvest. Inoculation of peeled fruits with spores of C. gloeosporioides showed germination without appressoria formation and symptom expression occurred 24‐48 h later. Symptom expression was delayed if fruits were inoculated after coating the flesh with epicuticular wax extracts or if the flesh was inoculated 3 days after harvest when the antifungal diene had regained a fungitoxic concentration. Disease symptoms were expressed in soft fruits containing subfungitoxic concentrations of the diene. We conclude that the diene in unripe avocado fruits inhibits fungal development of germinated appressoria or conidia. The quiescent structure of C. gloeosporioides in unripe avocado fruit is a subcuticular hypha. Copyright © 1991, Wiley Blackwell. All rights reserved
Scientific Publication
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