Biochemical changes associated with senescence, Biology

Biochemical Changes Associated with Senescence

When senescence begins many physiological and biochemical changes take place. For example, one of the important changes observed is in chlorophyll content. Its level starts declining. As a result, the capacity of CO2 fixation also declines and the overall structure of chloroplast in terms of organisation of thylakoids gets disturbed. For quite some time the rate of respiration remains constant but later it also drops and the supply of ATP is reduced. It is also shown that a number of degradative enzymes like proteases (hydrolyse proteins), ribonucleases (hydrolyse nucleic acids), β-glucan hydrolases (which loosens cell wall), chlorophyllase (which degrades chlorophyll) are produced which result in catabolism and finally over a period of time, the plant succumbs and dies.

Posted Date: 1/17/2013 8:01:55 AM | Location : United States







Related Discussions:- Biochemical changes associated with senescence, Assignment Help, Ask Question on Biochemical changes associated with senescence, Get Answer, Expert's Help, Biochemical changes associated with senescence Discussions

Write discussion on Biochemical changes associated with senescence
Your posts are moderated
Related Questions
Snakes Non-poisonous snakes can be brought into the classroom for observation. The diagram shows how a safe cage can be made for keeping a snake. The bottom should be covered w

Chemical Stress - Mineral composition The living systems make use of several mineral ions that they might have encountered at the very origin or during evolution, particularly

Define Cardiovascular endurance Component for physical fitness? In our previous section on work capacity, concepts of aerobic capacity Vo2 max were described. Cardiovascular en

How Poor Selection of Food causing the Underweight? Poor Selection of Food: Poor selection of food along with irregular eating habits may be responsible for insufficient food

Explain about enzymes All enzymes are proteins. Many enzyme  proteins lack catalytic activity in the absence of a non-protein component, called a 'co-factor'. In this case, the

Q. What are the fundamental constituents of the cell membrane? The cell membrane is formed of lipids, carbohydrates and proteins. The membrane lipids are phospholipids, a sp

LYSOSOMES Like mitochondrial lysosomes are also  typical membrane bound and dense  fluid filled sac  like cytoplasmic  organelles  of all eukaryotic cells these  however, diffe

Determine the types of Cell Based OII the degree of complexity of the cell organisation, two types of cells, namely, prokaryotes and eukaryotes, are recognised. The prokaryotic

Q. What do ADP and ATP mean? What are the functions of these molecules for the cellular energetic metabolism? ADP is an short form of adenosine diphosphate, two molecules of ph

Q. What are the classes into which the phylum Echinodermata is divided? The five echinoderm classes are: asteroids (starfishes), ophiuroids, crinoids, holothuroids (sea cucumbe