Dormancy - plant growth substances, Biology

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.

Posted Date: 1/24/2013 2:18:03 AM | Location : United States







Related Discussions:- Dormancy - plant growth substances, Assignment Help, Ask Question on Dormancy - plant growth substances, Get Answer, Expert's Help, Dormancy - plant growth substances Discussions

Write discussion on Dormancy - plant growth substances
Your posts are moderated
Related Questions
Food Applications of Locust bean gum Locust bean gum has multiple applications in food industry.  Let us focus on a few of the important ones: Locust bean gum has been u

Explain Enzymatic Proteins The most varied and most highly specialized proteins are those with catalytic activity - the enzymes. Virtually all the chemical reactions of organic

Q. Colony collapse disorder in honey bees? Honey bees (Apis mellifera) are social insects and live in colonies in hives. Honey bees were introduced from Europe to the USA to po

What is Community Ecology explain their characterstics? Community Ecology: In ecological terms, a community consists of an assemblage of all of the populations living and int

Lactase non-persistence is an example of a genetic trait that has been influenced by cultural factors.Domestication of animals by humans began approximately 10  000 years ago. Farm

What are the properties og Gels? Polysaccharides, proteins or colloidal complex particles, such as caseinate micelles  form gels at levels of 10% or less. Gums, pectin and gela

Leukaemia Leukaemia is a malignant disease of blood forming organs of the body  that results  in uncontroled  growth of  immature white blood cells. The leukaemic process in t

Define about the Growth and development in children? Growth and development in children can be studied under the following heads: . • Changes in physical development and bod

LOCOMOTION IN STAR FISH - With the help of tube feet aided by fluid pressure in them. In a tube feet upper ampulla, middle podium and lower sucker present.

Variability refers to the differences in heritable traits exhibited by the individuals of a species. One of the major contributions of Darwin to the study of evolution was his book