Dormancy - plant growth substances, Biology

Assignment Help:

Dormancy - Plant Growth Substances

Dormancy can be defined as a state of suspended growth and metabolism. When most plants are exposed to seasonal periods of very inclement weather during which they would be damaged or killed if some protective mechanism did not exist. The most common safeguard against freezing cold or extreme dry heat is dormancy. Dormancy takes many forms like seed dormancy and bud dormancy. Dormancy as a state is marked by very low levels of water content; low metabolic rates, tolerance to low temperatures and dry conditions, etc. Dormancy is 'innate' (because of certain inbuilt causes and controlled genetically) in some cases or 'induced' by external factors in other cases. Induced dormancy is avoidable if dormancy inducible external factors are avoided.

Dormancy is a defense mechanism against winter frost or summer drought and is a necessary part of the lives of many plants. Dormancy must occur at the right time. It must last for a sufficient time, and it must be relieved or broken when the conditions are right for resumption of growth. There are, four basic questions that' must be asked about dormancy of a particular plant or organ. What are the environmental signals that start the process, and how are they perceived? What is the duration of dormancy? A timing mechanism appears to be necessary to ensure that the plant does not accidentally reawaken during unfavorable conditions. What is the nature of dormancy and what are the mechanisms for bringing about the dormant condition? Dormancy is not just an inactivation of metabolism, but frequently involves the development of specialised organs (for example, bud scales) or substances (for example, gummy waterproofing materials): Dormancy is evidently a programmed developmental event that requires specialised synthetic metabolism in addition to turning of metabolic activities.


Related Discussions:- Dormancy - plant growth substances

What is the use of uristix, What is the Use of Uristix There are some e...

What is the Use of Uristix There are some enzymatic products and reagents impregnated on paper or plastic strips and dipping them in urine provide the results in less time comp

Vesicular exanthema, Vesicular exanthema Vesicular exanthema of pigs close...

Vesicular exanthema Vesicular exanthema of pigs closely resembles foot-and-mouth disease in these animals. The virus causing the disease belongs to the genus Calicivirus in the fa

Processing grains and oil seeds for animal feeding, Processing grains and o...

Processing grains and oil seeds for animal feeding Simple processing of grains such as grinding facilitates the digestion particularly in cattle and buffaloes. Fine grinding of

Origin of plastid, ORIGIN (1) From Pro plastid (2) Division (3) E...

ORIGIN (1) From Pro plastid (2) Division (3) Endosymbiotic origin from a cyanobacterium

How can we keep our brain healthy in older age, Is there anything I can do ...

Is there anything I can do to keep my brain healthy in older age? It is increasingly clear that how we live our lives on a daily basis strongly influences how well our brain ag

Name the different systems of the body, The Different systems of the body a...

The Different systems of the body are: 1) Nervous System 2) Respiratory System 3) Cardiovascular System 4) Neurological and Sensory System 5) Gastrointestinal Syste

Patient and probe positioning, Patient Positioning The patient  should...

Patient Positioning The patient  should be  in  the  left lateral position as  this brings the heart into contact with chest wall. The left arm is extended behind  the head  t

Explain the generalities, Explain the Generalities? A binary system has...

Explain the Generalities? A binary system has two components; C equals 2, and the number of degrees of freedom is F = 4 - P. There must be at least one phase, so the maximum po

Difference between myosin and actin filaments, DIFFERENCE S BETWEEN MYOSIN...

DIFFERENCE S BETWEEN MYOSIN AND ACTIN FILAMENTS     Myosin filaments (primary filaments)   Actinfilament s (secondary filaments)

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