Chilling and flower induction, Biology

Assignment Help:

Chilling and Flower Induction

Some plants flower only after passing a winter season. For example, winter wheat is sown in the autumn for harvest in the following summer. It needs exposure to cold. If winter is mild, plants do not flower and the crop fails. It has been shown that winter wheat and many other plants require a period of chilling 0° -2° C for about a week for flower formation. The cold treatment given for flower induction is called vernalisation. The technique of vernalisation was developed in Russia where winter crop required chilling for successful cultivation. The seeds are soaked for small period to initiate germination and then they are buried in the snow. Later, they are planted in the spring when severely cold conditions are over.

Thus chilling is also a stimulus for flower induction. Which part of the plant requires chilling stimulus for floral induction? Experiments show that only the shoot apex receives the stimulus (needs vernalisation) which then is passed on to the other parts of the plant. When the shoot apex that has received the stimulus is pinched off, the lateral shoots flower and if their apices are also pinched off, the side shoots develop and flower. Moreover when extracts of a vernalised plant are applied to a long-day plant growing under short-days the recipient plant flowers. Like light induction, the stimulus can also pass through a graft to a non-vernalised plant. These results show that some kind of flowering stimulus is transmitted from shoot apex to other tissues. The chilling stimulus was named vernalin. The nature of this compound has yet not been identified.


Related Discussions:- Chilling and flower induction

Seismic waves, Earthquake creates seismic waves that travel through and aro...

Earthquake creates seismic waves that travel through and around the surface of the earth. Seismic waves are the waves of energy caused by sudden breaking of rocks during an earthqu

Structure of the intestines, Describe the structure of the intestines. How ...

Describe the structure of the intestines. How are they modified to carryout their functions? How does the human intestine compare to the fetal pig?

Access burs through the crown-endodontics principles, Access burs through t...

Access burs through the crown:    Carbide fissure burs : cut through metal ( amalgam alloy or cast metal ) or composite resin.    Porcelain fused to metal : -A round diam

Determine requirement of trace elements for infant, Determine Requirement o...

Determine Requirement of Trace elements for Infant? Most elements, such as zinc and iodine, hold a major significance in infant nutrition. Zinc is associated with growth while

What is the physiological cause of the syndrome, What is the physiological ...

What is the physiological cause of the syndrome known as cretinism? Cretinism is caused by chronic deficiency of the thyroid hormones (T3 and T4) during childhood. The chronic

Inhibition of microorganisms in food, Q. Inhibition of microorganisms in fo...

Q. Inhibition of microorganisms in food? Microorganisms use our food supply as a source of nutrients and energy. They increase their numbers by utilizing nutrients. This can re

State the active hyperemia, Which of the following is true for active hyper...

Which of the following is true for active hyperemia, a local control mechanism within the circulatory system? A. There will be a decrease in force developed by smooth muscles s

Growth and development, what is the clear explanation of growth and develop...

what is the clear explanation of growth and development

Discuss the role of nadph in erythrocytes, Discuss the role of NADPH in ery...

Discuss the role of NADPH in erythrocytes The fragility of erythrocytes  is impaired in the absence of NADPH generation due to the deficiency of glucose-6-phosphate dehydrogena

Principal sources of excessive nitrate and phosphate, What are the principa...

What are the principal sources of excessive nitrate and phosphate in rivers and lakes? Excessive nitrates and phosphates come majorly from sewage effluents and intensive agric

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd