Lysenko (1928), a Russian worker, found that colds that require annual and biennial crops can flourish during one season by treating young plants or damp seeds at low temperatures.

 He called vernalization of the effects of this refreshing procedure. Vernalization is thus a period of shortening the youth or vegetative stage and of the rush to bloom by cool past therapy.

 For a few days to a half month, some plants anticipate low temperatures of 0 to 10°C for blooming. This acceptance of low temperature flowering is called vernalization


· Vernalisation increase can only be seen by meristematic cells (active apical meristem).

Top of the fire, tip of the birth organism, root summit, leaves 


I Low temperature: usually 0°—5° is low temperature necessary to vernalize.

(ii) Treatment period: from a few hours up to a few days it fluctuates.

(iii) Cells that are involved in dividing:

(iv) Water: Water:

(v) Respiration from Aerobics

(vi) Adequate nutrition.


ALL the improvement of shooting or undeveloped organism cells effectively divides and blooms all the parts of the plant.

THE STIMULUS was called vernaline.

Total can be transferred from one plant to the next, but not to the other by entering Henbane.

Two assumptions.  1. Phasic development theory • 2. Hormonal theories. 

Theory of phase growth

• Lysenko's 1934 proposal

• There is a progression of phases of the betterment of a plant in accordance with this theory.

• An ecological element, for example temperature, light and so on, animates each point.

• One stage will begin just after the procedure phase is completed

Two phases

1.Thermophase • 2.Photophase are available.

• Temperature-based thermophase.

Thermophase rapids vernalization.

• Photophase which needs light should be trailed to the thermophase.

Theory of hormones

• Melcher • Melcher (1939)

• He proposed the synthesis of another floral hormone called vernaline as a consequence of the chilling procedure.

• The hormone is sent to various plant parts.

• A vernalized plant was graphicated with an unvernalized plant.

• The plant that is unverified often begins to flower.

• The vrnalin hormone diffuses from an unvernalized plant and causes flowering.


· By means of the resulting high temperature treatment the beneficial outcome of low-temperature plants vernalization can be monitored. This is referred to as devolution.

— If cool care has been longer, the devernalization level decreases.

· However, with the resulting low temperature therapy the devernalized plant again can be vernalized.

VERNALIZation significance

—Addresses early flowering, thereby shortening plants' vegetative period (creation of more than one yield in a year).

—The winter harvest range can be modified to the spring range (Protection from freezing injury).

TerrainIt helps to increase plant production.

iv) Promotes defence against different diseases in the initiation.

• Terrestrial plants (last summer requirements) in quiet areas can be filled (short summer).


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