This hormone may be a internal secretion that replace vernalization. it may be a amount ofcold treatment for plants sometimes perennial or trees.Some plants won't bloom while not it.In vernalization plants are exposed to vasoconstrictor so as to stimulate flowering or to reinforce seed production.Thats it.

Introduction:
Vernalization is a process in which a period of cold temperature exposure is required to induce or accelerate flowering in certain plants. This process helps plants to adapt to seasonal changes and ensures that flowering occurs at the appropriate time. However, it is possible to replace vernalization using certain hormones.

Gibberellins as a replacement for vernalization:
Gibberellins are plant hormones that can replace the requirement for vernalization in some plant species. They promote stem elongation, flowering, and seed germination. Gibberellins can stimulate flowering in plants that normally require vernalization by bypassing the need for cold temperature exposure.

Mechanism of gibberellins in flowering induction:
Gibberellins act by promoting the transition from vegetative growth to reproductive growth in plants. They stimulate the production of proteins called transcription factors, which regulate the expression of genes involved in flowering. These transcription factors activate the expression of flowering genes, such as those encoding floral meristem identity genes. As a result, the plant undergoes the transition to flowering without the need for vernalization.

Examples of plants that respond to gibberellins:
Several plant species have been shown to respond to gibberellins in terms of flowering induction. For example:

1. Arabidopsis thaliana: This model plant species requires vernalization for flowering. However, application of gibberellins can bypass the need for vernalization and induce flowering.

2. Wheat: Certain varieties of wheat require vernalization for flowering. However, treatment with gibberellins can promote flowering even in the absence of vernalization.

3. Barley: Similar to wheat, gibberellins can replace the requirement for vernalization in barley and induce flowering.

Conclusion:
Gibberellins are plant hormones that can replace the need for vernalization in certain plant species. By promoting the transition to flowering, gibberellins bypass the requirement for cold temperature exposure. This ability of gibberellins to induce flowering without vernalization is valuable in agricultural practices and breeding programs, as it allows for more efficient control of flowering time in plants.