Flower senescence
Summary :
Table of Contents
- Introduction.
- Categories of flower senescence.
- Age related versus pollination induced.
- Ethylene sensitive versus ethylene insensitive.
- Abscised versus persistent petals.
- From anthesis to senescence: Setting the stage.
- Physiological changes.
- Biochemical changes.
- Molecular changes.
- Conclusion.
Abstract
Flowers, no matter their size, shape, color or structure, have one important function for plants: sexual reproduction. Sexual reproduction consists of several distinct developmental processes including pollen production, ovule formation, and pollination, fusion of gametes and the development and dispersal of viable seeds. Many flowers have the additional function of attracting pollinators. The initial attraction between flowers and their pollinators can be the result of petal or corolla color or shape, or chemical composition of the flower, whereas the end of a flower's attraction to pollinators is the result of petal or corolla in rolling or closure, color changes, changes in chemical composition of flower scent or nectar, and ultimately withering or abscission of the petals. Therefore, pollination and subsequent changes in the flower corolla can be seen as a way of communication between the flower and pollinators.
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