Vernalisation in Plants

Definition of Vernalisation - The change of flowering habit due to the low temperature treatment is known as vernalisation.

This is a physiological process which was denoted by Clipart in 1857 invite but later it was explained and named by Lysenko in 1928. As like as photoperiodism vernalisation can also comes under the physiological preconditioning for flowering in higher plants.

Mechanism of Vernalisation - At first it was believed that cold stimulus was received by the apical Meristem but in 1964 valency have shown eat in lunar year that the meristematic cells of roots and leaves can also be the potential sites of vernalization. In 1939 milkers name the hormone 118 and said that it is to be the cause of vernalization. But till date it remains a postulated hormone which has not been isolated or identified but the positive effect of vernalization can be reversed by subsequent high temperature treatment which is known as de-vernalization.

Various requirements of Vernalization - Various requirements of vernalization are following -

* Continuous exposure to low temperature for a few days is essential.

* Sales should be actively dividing in nature.

* Proper nourishments should be provided.

* Proper hydration is essential.

* Cells should have aerobic respiration.

Devernalization - Devernalization is the process which can be done if vernalization is followed by unfavourable photoperiodic condition or reduced water supply for high temperature. In many cases uses of gibberellins can replace the requirement of vernalization because it stimulates vernalization and the stimulus of vernalisation is known as handling do it was still un identified. Vernalization does not pass from one plant to another through grafting except in some plants and vernalization is believed to overcome inhibitors and induce the synthesis of growth hormones like gibberellins it also prepares the plants for flowering.

Eleventh Grade

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