Abscisic acid is a plant hormone that plays a crucial role in regulating various physiological processes, including seed dormancy, stress response, and growth inhibition. It is a small, colorless, and odorless organic compound that is synthesized in response to environmental cues such as drought, cold, and high salinity. In this article, we will explore the definition, meaning, and associations of abscisic acid.
Definitions
Abscisic acid, also known as ABA, is a naturally occurring plant hormone that regulates various physiological processes. It was first discovered in the 1960s and is synthesized in the plastids and cytosol of plant cells. Its chemical formula is C15H20O4, and it belongs to the group of sesquiterpenes.
Origin
Abscisic acid was first isolated from the latex of the American sweet gum tree, Liquidambar styraciflua. Later, it was found to be present in many other plants, including mosses, ferns, and angiosperms. It is synthesized in response to various environmental cues, such as water stress, cold, and high salinity.
Meaning in different dictionaries
According to the Merriam-Webster dictionary, abscisic acid is “a plant hormone C15H20O4 that is involved especially in the inhibition of shoot growth and the promotion of leaf senescence and dormancy.” The Oxford English Dictionary defines it as “a plant hormone that inhibits growth and promotes dormancy in seeds and buds.”
Associations
Abscisic acid is associated with various physiological processes in plants, including seed dormancy, stress response, and growth inhibition. It is also involved in stomatal regulation, which helps plants to conserve water during periods of drought. In addition, abscisic acid plays a role in fruit ripening and senescence.
Synonyms
Some synonyms of abscisic acid include ABA, dormin, and abscisin II.
Antonyms
As abscisic acid is a plant hormone, it does not have any antonyms.
The same root words
Abscisic acid is derived from the Latin word “abscisio,” which means cutting off. This is because it was first discovered as a hormone that promotes the abscission or shedding of leaves and fruits.
Example Sentences
- Abscisic acid plays a crucial role in regulating seed dormancy and germination.
- Plants produce abscisic acid in response to drought and other environmental stresses.
- The application of abscisic acid can help to improve the shelf life of fruits and vegetables.
- Abscisic acid inhibits the growth of shoots and promotes the senescence of leaves.
- The synthesis of abscisic acid is regulated by various genes and environmental cues.