Photosynthesis - responses of plants to stress, Biology

Photosynthesis - Responses of Plants to Stress

Photosynthesis is also inhibited due to low water potential in the leaves. The leaf water potential is the sum of turgor pressure osmotic potential and matric potential. In very simple words, it represents the degree of saturation of the tissue with water. At low leaf water potentials, photosynthesis is inhibited by:

  1. Stomatal closure (limiting the gas exchange), and
  2. Decrease in photosynthesis.

During dehydration both quantum efficiency (i.e., moles of CO2 fixed per mole of light quanta absorbed) and the rate of photosynthesis are inhibited in leaves exposed to either high or very low light intensity. This phenomenon is called photo inhibition of photosynthesis. Photo inhibition is probably caused by accumulation of excessive excitation energy at photosystem II reaction centre complex. In this way exposure to light adds to the water stress when the plant's response already would be to decrease photosynthesis.

Posted Date: 1/18/2013 12:17:06 AM | Location : United States







Related Discussions:- Photosynthesis - responses of plants to stress, Assignment Help, Ask Question on Photosynthesis - responses of plants to stress, Get Answer, Expert's Help, Photosynthesis - responses of plants to stress Discussions

Write discussion on Photosynthesis - responses of plants to stress
Your posts are moderated
Related Questions
Define on which severity of heat treatment for pasteurization depends? The severity of heat treatment for pasteurization depends on: 1.  Heat resistance of target microorgan

Proteins of Animal Origin - Egg Eggs:  Roughly, the chicken egg consists of 11% shell, 31% yolk and 58% white. Liquid whole egg consists of 65% white and 35% yolk. The primary

Budding - Types of Asexual Reproduction In reproduction through budding, small groups of cells form buds in some part or parts of the parent animal. The bud grows, differentia

Bacteria called extremophiles are able to grow in hot springs such as Old Faithful at Yellowstone National Park in Wyoming. Do you think that the DNA of extremophiles would have a

Fusion inhibitor  After HIV binds to the host cell surface, a conformational change occurs in the transmembrane glycoprotein sub- unit (gp41) of the viral envelope, facilitatin

What are the factors responsible for corneal hydration? The factors responsible for corneal hydration are as follows: i. Stromal swelling pressure ii. Barrier function of

Use of micro-organisms to control insect pests, pathogens or weeds constitutes biological control, and the biological agents employed are called biocontrol agents. Micro-organis

Explain the term Kwashiorkor? The term Kwashiorkor means the 'disease the first child gets when the second baby is born', that is, 'the sickness of the deposed child'. Thus, th

An A=T mispairing leads to an A=C substitution. The other DNA helix will contain a(n) __ pair. a. A=C b. A=T c. G=C d. B=Q e. T=T Can you also explain it please so if I'm ask

What action is EPA taking on plant-incorporated protectants? EPA has issued three final rules clarifying and formalizing EPA's framework for federal oversight of plant-incorpor