Roles of abscisic acid, Biology

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.
Posted Date: 1/17/2013 6:14:37 AM | Location : United States







Related Discussions:- Roles of abscisic acid, Assignment Help, Ask Question on Roles of abscisic acid, Get Answer, Expert's Help, Roles of abscisic acid Discussions

Write discussion on Roles of abscisic acid
Your posts are moderated
Related Questions
which hormone is secret in salivary gland?

Define Most Probable Number (MPN) Method? The MPN method is like agar shake tube method where no agar is used. The dilutions of the microbial suspension are made in liquid medi

Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo

Enumerate about the Traumatic brain injuries Brain injury is a common result of automobile and industrial accidents and of war injuries. Brain injury can affect brain function

Q. Show the Paleobotanical Evidence? Paleobotany deals with the study of fossil records of plants and animals. New techniques and approaches to the study of fossil flowering pl

1. Biogas is produced by the activity of aerobic bacteria on animal waste 2. Methanobacterium is an aerobic bacterium found in rumen of cattle 3. Biogas, commonly called goba

(1)   It should have high "calorific value" or heat content. (2)   It should have "moderate ignition temperature". (lgnition temperature is the minimum temperature at which it s

Q. What is the fundamental difference between algae and protozoans? The basic difference between algae and protozoans is the fact that algae are photosynthetic autotrophs while

Mention causes of implant failure due to restorative problems. 1) Restorative problems: a) Excessive cantilever. b) Use of implants with rigid prosthetic connection with

Bud grafting A 'T' shaped incision is made on the bark of the stock. A bark is removed on either side of vertical cut. A single bud scion with a little wood is placed