Vernalization

Type :

Presentation

Pages :

4 pages

Format :

.doc

Published date :

11/17/2008

Category :

Science & technology

Sub category :

Biology

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Summary :

Introduction.
Vernalization and flowering time control.
Dissecting the molecular processes involved in vernalization.
Addressing the mechanisms of vernalization using Arabidopsis as a model.
Arabidopsis vernalization requirement.
1. Early description of the vernalization requirement of Arabidopsis.
2. The characterization of loci.
3. Naturally occurring allelic variation at FLC.
Conclusion.

Abstract

The term vernalization is derived from the Latin word vernus meaning 'of the spring'. vernalization was defined as 'the acquisition or acceleration of the ability to flower by a chilling treatment'. The promotion of flowering by vernalization is the result of subjecting an imbibed seed or young plant to a long period of cold (typically weeks). Floral initiation does not occur in the cold treatment but only after returning the plant to a higher temperature and in many cases a specific photoperiod. Therefore, cold temperatures do not cause plants to initiate floral primordia, but create the capacity for subsequent flowering. vernalization can be facultative or obligate. Winter annuals have a facultative vernalization requirement, as cold accelerates, but this is not required for flowering. Biennials, cannot flower without cold treatment and therefore have an obligate requirement for vernalization. Summer annuals flower rapidly without a vernalization treatment.