Possible involvement of ethylene in water stress-induced flower abscission in sweet pepper Capsicumannum L.

Hawa Z. Jaafar, . (2000) Possible involvement of ethylene in water stress-induced flower abscission in sweet pepper Capsicumannum L. [Proceedings Paper]

Water stress causes abscission of flowers in sweet pepper plants and thus reduces yields. The paper irvestigates the involvement of ethylene in water stress related flower abscission by determining internal ethylene production during water stress and after an application of ethylene-releasing compound. Water stress significantly increased ethylene evolution from sweet pepper flowers just before abscission to 40-fold greater than that measured before anthesis. Its evolution from the flowers also increased by up to eightfold compared with unstressed control plants. In unstressed plants ethylene evolution from the flowers and leaves increased with age but the former always registered lower evolution rate than the leaves. In stressed plants however ethylene evolution from the flowers was threefold greater than that from the leaves. The application of ethylene-releasing compound 2chloroethylphosphonic acid CEPA to flower buds mimicked the effects of water stress by increasing abscission following an increase in ethylene evolution from the buds. This observation strongly suggests that ethylene mediates the impact of water stress on flower abscission. Exogenous ethylene applications also promoted bud abscission. The severity and acceleration of flower abscission following CEPA application was dependent upon the concentration applied. At 100 mg/L CEPA almost 100 abscission occurred on day 2 after application following a peak in ethylene evolution on day 1. Treatment with 50 mg/L CEPA induced complete abscission on day 4 following a peak in ethylene evolution on days 2 -3 after application. Sweet pepper flowers were capable of forming abscission lines at the base of the pedicels following exposure to elevated endogenous ethylene concentrations caused either by water stress or exogenous ethylene application. Mature pepper leaves were incapable of forming abscission layer.

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Abstract

Water stress causes abscission of flowers in sweet pepper plants and thus reduces yields. The paper irvestigates the involvement of ethylene in water stress related flower abscission by determining internal ethylene production during water stress and after an application of ethylene-releasing compound. Water stress significantly increased ethylene evolution from sweet pepper flowers just before abscission to 40-fold greater than that measured before anthesis. Its evolution from the flowers also increased by up to eightfold compared with unstressed control plants. In unstressed plants ethylene evolution from the flowers and leaves increased with age but the former always registered lower evolution rate than the leaves. In stressed plants however ethylene evolution from the flowers was threefold greater than that from the leaves. The application of ethylene-releasing compound 2chloroethylphosphonic acid CEPA to flower buds mimicked the effects of water stress by increasing abscission following an increase in ethylene evolution from the buds. This observation strongly suggests that ethylene mediates the impact of water stress on flower abscission. Exogenous ethylene applications also promoted bud abscission. The severity and acceleration of flower abscission following CEPA application was dependent upon the concentration applied. At 100 mg/L CEPA almost 100 abscission occurred on day 2 after application following a peak in ethylene evolution on day 1. Treatment with 50 mg/L CEPA induced complete abscission on day 4 following a peak in ethylene evolution on days 2 -3 after application. Sweet pepper flowers were capable of forming abscission lines at the base of the pedicels following exposure to elevated endogenous ethylene concentrations caused either by water stress or exogenous ethylene application. Mature pepper leaves were incapable of forming abscission layer.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK710.2 M239 2000 Call Number
AGROVOC Term:	Sweet peppers
AGROVOC Term:	Capsicum annuum
AGROVOC Term:	Experiments
AGROVOC Term:	Glasshouses
AGROVOC Term:	Abscission
AGROVOC Term:	Water stress
AGROVOC Term:	Ethylene
AGROVOC Term:	Ethylene production
AGROVOC Term:	Flowers
AGROVOC Term:	Leaves
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:15
URI:	http://webagris.upm.edu.my/id/eprint/12881

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