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Chilling-induced leaf abscission of Ixora coccinea plants. I. Induction by oxidative stress via increased sensitivity to ethylene
Year:
1999
Source of publication :
Physiologia Plantarum
Authors :
Meir, Shimon
;
.
Michaeli, Rina
;
.
Philosoph-Hadas, Sonia
;
.
Volume :
107
Co-Authors:
Michaeli, R., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Philosoph-Hadas, S., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Riov, J., Kennedy-Leigh Ctr. for Hort. Res., Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Meir, S., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
166
To page:
173
(
Total pages:
8
)
Abstract:
Exposing ixora (Ixora coccinea) plants to chilling temperatures (3-9°C for 3 days) resulted in increased leaf abscission, initiated 3 days after transfer to 20°C. Exposure to chilling also induced a 7-fold increase in ethylene production rates of abscission zone (AZ) tissue during the initial 5 h after chilling. The ethylene burst resulted from the high levels of 1-aminocyclopropane-1-carboxylic acid (ACC) accumulated in the AZ during the chilling period. ACC levels following chilling decreased also due to enhanced conjugation to 1-(malonylamino)cyclopropane-1-carboxylic acid (MACC). Treating plants prior to chilling with antioxidants, such as butylated hydroxyanisole (BHA), n-propyl gallate (PG), and vitamin E, significantly reduced chilling-induced leaf abscission. This effect was obtained despite the fact that ethylene production in the treated plants resembled that of chilled plants receiving no BHA. In addition, exposure of plants to ethylene (0.5-10 μl 1-1) for 1-3 days significantly enhanced leaf abscission only when they had been pre-chilled. These data imply that chilling-induced leaf abscission was closely correlated with increased sensitivity of the AZ to ethylene rather than with the chilling-induced ethylene burst. Based on the findings that the ethylene action inhibitor, 1-methylcyclopropene (1-MCP), and the antioxidant BHA inhibited both the chilling-induced and the ethylene-enhanced leaf abscission, it is concluded that: (1) although ethylene is essential for chilling-induced abscission, it is not the triggering factor; (2) oxidative processes derived from the chilling stress seem to be the trigger of chilling-induced leaf abscission, operating via increased sensitivity to ethylene.
Note:
Related Files :
abscission
ethylene
temperature
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More details
DOI :
10.1034/j.1399-3054.1999.100203.x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
27742
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:33
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Scientific Publication
Chilling-induced leaf abscission of Ixora coccinea plants. I. Induction by oxidative stress via increased sensitivity to ethylene
107
Michaeli, R., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Philosoph-Hadas, S., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Riov, J., Kennedy-Leigh Ctr. for Hort. Res., Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Meir, S., Dept. Postharvest Sci. Fresh Produce, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Chilling-induced leaf abscission of Ixora coccinea plants. I. Induction by oxidative stress via increased sensitivity to ethylene
Exposing ixora (Ixora coccinea) plants to chilling temperatures (3-9°C for 3 days) resulted in increased leaf abscission, initiated 3 days after transfer to 20°C. Exposure to chilling also induced a 7-fold increase in ethylene production rates of abscission zone (AZ) tissue during the initial 5 h after chilling. The ethylene burst resulted from the high levels of 1-aminocyclopropane-1-carboxylic acid (ACC) accumulated in the AZ during the chilling period. ACC levels following chilling decreased also due to enhanced conjugation to 1-(malonylamino)cyclopropane-1-carboxylic acid (MACC). Treating plants prior to chilling with antioxidants, such as butylated hydroxyanisole (BHA), n-propyl gallate (PG), and vitamin E, significantly reduced chilling-induced leaf abscission. This effect was obtained despite the fact that ethylene production in the treated plants resembled that of chilled plants receiving no BHA. In addition, exposure of plants to ethylene (0.5-10 μl 1-1) for 1-3 days significantly enhanced leaf abscission only when they had been pre-chilled. These data imply that chilling-induced leaf abscission was closely correlated with increased sensitivity of the AZ to ethylene rather than with the chilling-induced ethylene burst. Based on the findings that the ethylene action inhibitor, 1-methylcyclopropene (1-MCP), and the antioxidant BHA inhibited both the chilling-induced and the ethylene-enhanced leaf abscission, it is concluded that: (1) although ethylene is essential for chilling-induced abscission, it is not the triggering factor; (2) oxidative processes derived from the chilling stress seem to be the trigger of chilling-induced leaf abscission, operating via increased sensitivity to ethylene.
Scientific Publication
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