Chilling and flower induction, Biology

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.

Posted Date: 1/17/2013 7:24:41 AM | Location : United States







Related Discussions:- Chilling and flower induction, Assignment Help, Ask Question on Chilling and flower induction, Get Answer, Expert's Help, Chilling and flower induction Discussions

Write discussion on Chilling and flower induction
Your posts are moderated
Related Questions

Explain circulatory support and types of shock? CIRCULATORY SUPPORT 1) A "shock" state is characterised by hypoperfusion of tissue and cellular hypoxia. Circulatory suppo

Have you ever said, ‘I cannot cope up with this?' Or have you heard any one who is sick in your family saying, ‘I cannot cope with my sickness' or ‘I can not take care of this sick

assignment on tissues

Which of the following best describes the tenants of Pangenesis Theory? A. The hereditary material is composed in every organ/tissue and is transmitted to the next generation b

Q. How are amino acids brought to the cellular site where translation takes place? What is an anticodon? Amino acids are brought to ribosomes by RNA molecules known as transfer

(i)    Effect on Human Health: Air pollution causes many respiratory problems in human being. (1)   Dust, soot and smog causes several respiratory troubles such as bronc

Determine the genotypes and phenotypes of the F1 generaiton from a colour blind father and a mother who is homozygous for normal colour vision

Q. Vitamins requirement in dyslipidemia? Antioxidants and flavonoids, natural vitamin E, vitamins C and Aare nutrients (vitamins) that scavenge cell-damaging free radicals and

What does skin color in man shows?