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

What is the life cycle of the hookworms, Q. What is the life cycle of the h...

Q. What is the life cycle of the hookworms? The Adult hookworms within the human intestine release eggs that are eliminated with the human feces. Under the adequate conditions

Is the bone marrow made of osseous tissue, Q. In which bones can bone marro...

Q. In which bones can bone marrow chiefly be found? Is the bone marrow made of osseous tissue? Bone marrow can mainly be found in the internal cavities of flat bones, like the

Coronary arteries, Coronary Arteries The right coronary artery origina...

Coronary Arteries The right coronary artery originates form the right aortic valvular cusp, its, SA nodal branch supplies the SA node and AV nodal branch supply the AV nod

What do you mean by pericardial effusion, Q. What do you mean by Pericardia...

Q. What do you mean by Pericardial effusion? Collection of fluid in the pericardial sac is known as Pericardial effusion. All cases of pericarditis can lead to pericardial effu

Fermentation products -distilled liquor products, Normal 0 fals...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Prepare a dichotomous key, Prepare a dichotomous key the following organism...

Prepare a dichotomous key the following organisms, ant, butterfly, fly, beetle, grass hopper, wasp, ladybug, roach and dragonfly

Effects of malnutrition, Effects of malnutrition The effects of maln...

Effects of malnutrition The effects of malnutrition are not the same in adults and children. When the amount of food is not sufficient or when the nutrients are missing f

Describe cluster analysis, Q. Describe Cluster analysis? After making a...

Q. Describe Cluster analysis? After making a similarity table, it is then rearranged so that OTU's whose members have the highest mutual similarity are brought together. This c

DIVERSITY OF AMPHIBIANS, DIVERSITY OF AMPHIBIANS ASSIGNMET IN BIOLOGY PLWAS...

DIVERSITY OF AMPHIBIANS ASSIGNMET IN BIOLOGY PLWASE HELP ME TO DO THIS ASSIGNMENT AND I CAN GET GOOD MARKS IN THIS ASSIGNMENT SO GIVE ME TNE ASSIFNMENT OF THIS TOPIC DIVERSITY OF A

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