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Flower Senescence-Strategies and Some Associated Events

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Abstract

Different strategies of petal senescence and some important events associated with it have been discussed. On the basis of sensitivity to ethylene and associated symptoms of senescence, petal senescence has been classified into five different classes; besides changes in membrane permeability, autophagy and involvement of VPEs (Vacuolar processing enzymes), degradation of nucleic acids, protein turn over and remobilization of essential nutrients during petal senescence have been discussed. Nucleus appears to play a central role in administrating the execution of the events associated with petal senescence. Protein turn over appears to be an important factor governing petal senescence in both ethylene-sensitive and ethylene-insensitive flower systems and that the loss of membrane integrity, vacuolar autophagy and remobilization of essential nutrients being its important consequences. Autophagy seems to be a main process responsible for cell dismantling and remobilization of macromolecules besides final disintegration of nucleus. A large number of senescence-associated genes have been found to be differentially expressed during petal senescence. On the basis of the available literature, a schematic model representing some important events associated with petal senescence has been constructed. The review recommends that more elaborate work is required at cellular and organelle level to understand the ethylene-independent pathway and its execution in both ethylene-sensitive and ethylene-insensitive flower systems. It also recommends that ethylene sensitivity should not be generally assigned to plants at the family level on the basis of response of a few species in a family.

Résumés

des stratégies différentes de pétale senescence et certains événements importants associés ont été discutés. Sur la base d’une sensibilité d’éthylène et les symptômes associés de sénescence, pétale senescence ont été classé en cinq différentes classes ; outre les modifications dans la perméabilité de la membrane, Autophagie et l’implication des VPEs (Vacuolar traitement des enzymes), la dégradation des acides nucléiques, protéines tour sur re de nutriments essentiels au cours de la senescence pétale ont été discutés. Noyau semble jouer un rôle central dans l’administration de l’exécution des événements associés pétale senescence. Tour de protéines sur semble être un facteur important régissant pétale senescence dans les systèmes de fleur d’éthylène sensibles et éthylène-insensible et que la perte d’intégrité de la membrane, Autophagie vacuolar et re de nutriments essentiels à ses conséquences importantes. Autophagie semble être un processus principal responsable du démantèlement de la cellule et re de macromolécules outre finale désintégration du noyau. Un grand nombre de gènes associés senescence a été trouvé pour être exprimé différemment au cours de la senescence pétale. Sur la base de la documentation disponible, un modèle schematic représentant certains événements importants associés pétale senescence a été construit. L’examen recommande qu’un travail plus élaboré est nécessaire au niveau cellulaire et Organite pour comprendre la voie de l’éthylène-indépendante et son exécution dans les deux systèmes de fleur d’éthylène sensibles et éthylène-insensible. Elle recommande également que éthylène sensibilité ne doit pas être généralement affectée aux plantes au niveau familial sur la base de la réponse de quelques espèces dans une famille.

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Acknowledgements

The authors thank Prof. G. H. Dar, Head Department of Botany, for his cordial support. Waseem Shahri thanks University Grants Commission, India for providing Junior Research Fellowship.

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  1. Department of Botany, University of Kashmir, Srinagar, India, 190006

    Waseem Shahri & Inayatullah Tahir

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  1. Waseem Shahri
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  2. Inayatullah Tahir
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Correspondence to Waseem Shahri.

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Shahri, W., Tahir, I. Flower Senescence-Strategies and Some Associated Events. Bot. Rev. 77, 152–184 (2011). https://doi.org/10.1007/s12229-011-9063-2

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  • DOI: https://doi.org/10.1007/s12229-011-9063-2

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