Login
Remember
Register
Topic Wise Biology MCQs
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Categories
Ask a Question
Ask a Question
Home
Plant Physiology
Transport in plants
What is the role of Abscisic acid?
What is the role of Abscisic acid?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
Your comment on this question:
Your name to display (optional):
Email me at this address if a comment is added after mine:
Email me if a comment is added after mine
Privacy: Your email address will only be used for sending these notifications.
Your answer
Your name to display (optional):
Email me at this address if my answer is selected or commented on:
Email me if my answer is selected or commented on
Privacy: Your email address will only be used for sending these notifications.
1
Answer
0
votes
answered
by
Lifeeasy Authors
ROLE OF ABSCISIC ACID
Abscisic acid is a stress hormone, which is also known as dormin due to the effect of bud dormancy seen in the plant during the presence of abscisic acid.
It was first discovered as an inducing substance for the fall of cotton fruits.
The main role of the hormone is dormancy, it effects on the induction and maintenance of dormancy.
It also stimulates stomata closing during the condition of water stress.
It plays a role in decreasing the resistance for the water movement across the membrane and increase the ion flux of root.
The presence of this hormone inhibits the stem elongation whereas sometimes it promotes the growth of roots.
ABA stimulates the concentration of calcium in the cytosol that activates anion channels by which anions release from the guard cells and the membrane gets depolarized.
The change in membrane potential deactivates K+ in channel and activates K+out channel, which leads to the stomatal closing by losing the guard cell turgor.
ABA also inhibit potassium uptake and proton pump, which performs the major role in the stomatal closing stimulated by blue light.
Your comment on this answer:
Your name to display (optional):
Email me at this address if a comment is added after mine:
Email me if a comment is added after mine
Privacy: Your email address will only be used for sending these notifications.
← Prev Question
Next Question →
Related questions
1
answer
Role of decomposers in the nitrogen cycle?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
nitrogen-cycle
1
answer
What role does denitrification play in the nitrogen cycle?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
nitrogen-cycle
1
answer
What is the main cause of guttation in plants?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
1
answer
What is the function of plasmodesmata?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
1
answer
What is the water potential of pure water?
asked
in
Transport in plants
by
Lifeeasy Biology
transport-in-plants
Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.
...