נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Chilling-induced leaf abscission of Ixora coccinea plants. III. Enhancement by high light via increased oxidative processes
Year:
2001
Source of publication :
Physiologia Plantarum
Authors :
Meir, Shimon
;
.
Michaeli, Rina
;
.
Philosoph-Hadas, Sonia
;
.
Ratner, Kira
;
.
Shahak, Yosepha
;
.
Volume :
113
Co-Authors:
Michaeli, R., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Philosoph-Hadas, S., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Riov, J., Kennedy-Leigh Centre for Horticultural Research, Faculty of Agriculture, Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel
Shahak, Y., Institute of Horticulture, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Ratner, K., Institute of Horticulture, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Meir, S., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
338
To page:
345
(
Total pages:
8
)
Abstract:
The role of increased oxidation induced by successive stresses of chilling and high light in the induction of leaf abscission was studied in Ixora coccinea plants in relation to auxin metabolism and oxidative processes. Exposure of plants following dark chilling (7°C for 3 days) to high light (500-700 μmol m-2 s-1 photosynthetically active radiation) for 5 h at 20-25°C enhanced chilling-induced leaf abscission. This abscission was inhibited by pretreatment with the antioxidant butylated hydroxyanisole, α-naphthaleneacetic acid or the ethylene action inhibitor, 1-methylcyclopropene. The oxidative processes initiated during the low light period following the dark chilling period, such as indoleacetic acid (IAA) decarboxylation and lipid peroxidation, were further enhanced by subsequent exposure to high light. Photoinhibition, expressed by the reduction of the chlorophyll fluorescence parameter Fv/Fm, was evident following exposure to high light, irrespective of the temperature of the pretreatment, but this reduction persisted only in chilled plants. This suggests that oxidative processes generated during and after the chilling period might have inhibited the recovery from photoinhibition. The chilling stress under darkness induced a 60% reduction in superoxide dismutase (SOD) activity and significant increases (130-600%) in the activities of several other antioxidative enzymes. These data suggest that the chilling-induced reduction in SOD activity may well be responsible for the increase in the oxidative stress induced by the subsequent light treatment, as expressed by the increased enzymatic activities. Taken together, this study provides further support for the involvement of oxidative processes in the events occurring in tissues exposed to sequential chilling and light stresses, leading to reduction in free IAA content in the abscission zone and to leaf abscission.
Note:
Related Files :
abscission
antioxidants
enzymes
metabolism
oxidation
photosynthesis
temperature
Show More
Related Content
More details
DOI :
10.1034/j.1399-3054.2001.1130306.x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31332
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:01
Scientific Publication
Chilling-induced leaf abscission of Ixora coccinea plants. III. Enhancement by high light via increased oxidative processes
113
Michaeli, R., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Philosoph-Hadas, S., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Riov, J., Kennedy-Leigh Centre for Horticultural Research, Faculty of Agriculture, Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel
Shahak, Y., Institute of Horticulture, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Ratner, K., Institute of Horticulture, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Meir, S., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Chilling-induced leaf abscission of Ixora coccinea plants. III. Enhancement by high light via increased oxidative processes
The role of increased oxidation induced by successive stresses of chilling and high light in the induction of leaf abscission was studied in Ixora coccinea plants in relation to auxin metabolism and oxidative processes. Exposure of plants following dark chilling (7°C for 3 days) to high light (500-700 μmol m-2 s-1 photosynthetically active radiation) for 5 h at 20-25°C enhanced chilling-induced leaf abscission. This abscission was inhibited by pretreatment with the antioxidant butylated hydroxyanisole, α-naphthaleneacetic acid or the ethylene action inhibitor, 1-methylcyclopropene. The oxidative processes initiated during the low light period following the dark chilling period, such as indoleacetic acid (IAA) decarboxylation and lipid peroxidation, were further enhanced by subsequent exposure to high light. Photoinhibition, expressed by the reduction of the chlorophyll fluorescence parameter Fv/Fm, was evident following exposure to high light, irrespective of the temperature of the pretreatment, but this reduction persisted only in chilled plants. This suggests that oxidative processes generated during and after the chilling period might have inhibited the recovery from photoinhibition. The chilling stress under darkness induced a 60% reduction in superoxide dismutase (SOD) activity and significant increases (130-600%) in the activities of several other antioxidative enzymes. These data suggest that the chilling-induced reduction in SOD activity may well be responsible for the increase in the oxidative stress induced by the subsequent light treatment, as expressed by the increased enzymatic activities. Taken together, this study provides further support for the involvement of oxidative processes in the events occurring in tissues exposed to sequential chilling and light stresses, leading to reduction in free IAA content in the abscission zone and to leaf abscission.
Scientific Publication
You may also be interested in