Roles of abscisic acid, Biology

Assignment Help:

Roles of Abscisic Acid

Abscisic acid (ABA) is a particularly interesting hormone with regard to the regulation of its own levels. Its levels rise and fall dramatically in several kinds of tissues in response to environmental and developmental changes. Following are the roles of Abscisic acid:

  • When leaves of mesophytic plants are water stressed (i.e. under water shortage condition) ABA levels can rise from.10 to 50-fold within 4-8 hours. When the plants are re-watered, the ABA levels drop dramatically within 4-8 hours.
  • It is generally believed that Abscisic acid induces dormancy in seeds to tide over adverse environmental conditions such as freezing temperature or stresses of hot dry periods causing water shortage. Dormancy is induced also in deciduous plants.
  • You have already learnt that when Abscisic acid accumulates in guard cells during periods of water shortage, it causes stomates to close thus enabling the plants to recover water balance.
  • The name Abscisic acid was originally proposed as early investigators believed that it caused flowers, fruits and leaves to abscise (fall). However, now there is dispute over whether ABA is involved at all in the abscission process.

Related Discussions:- Roles of abscisic acid

Define the hydrogen ion concentration in red blood cells, Which of the foll...

Which of the following processes help bring oxygen to the body cells that are in a leg? A. Net flux of oxygen from blood plasma into red blood cells in the body capillaries in

Brain thinking, in what form brain stores thinking or past experiences?

in what form brain stores thinking or past experiences?

Define the factors causing underweight - etiology, Define the Factors Causi...

Define the Factors Causing Underweight - Etiology? There are a number of factors causing underweight. These are: Poor selection of food Physical activity Mothe

Hemoglobin, describe the mechanism of allosteric change.

describe the mechanism of allosteric change.

Parenchymal inflammation, Parenchymal Inflammation Parenchymal inflamm...

Parenchymal Inflammation Parenchymal inflammation can be due to infectious diseases or acute bronchitis or pneumonia discussion will be mainly on pneumania in the following t

Explain galactose metabolism, Galactose Metabolism Galactose  goes to t...

Galactose Metabolism Galactose  goes to the liver via portal blood and is phosphorylated by galactokinase togalactose-  1  -phosphate (GIP) using ATP as  a phosphate donor as s

How different are oxyhemoglobin and hemoglobin, How different are oxyhemogl...

How different are oxyhemoglobin and hemoglobin? Where is it expected to find a higher concentration of oxyhemoglobin, in peripheral tissues or in the lungs? Oxygen-bound hemogl

Hassan, function of epithelial tissue

function of epithelial tissue

What does genetics have to do with biology, What does genetics have to do w...

What does genetics have to do with biology? Genetics is the study of the genes found in genetic material (ex. DNA). DNA is found in the nucleus of your cells. The most signific

Describe how many bones are there in human foot, Describe how many bones ar...

Describe how many bones are there in human foot The human foot is a great mechanical marvel. It has 26 bones, 29 joints, and 42, various ligaments, a sensitive and protective s

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