Biology Tutorials > Control of Growth & Development > Gibberellins and Gibberellic Acid

Gibberellins and Gibberellic Acid

Gibberellins and Gibberellic Acid

Gibberellins are plant hormones that regulate a wide range of processes, such as flowering, growth (by stem elongation), seed germination, and fruit ripening.

The family of gibberellins have a similar effect to that of auxins; they promote cell division and elongation. The major difference is that gibberellins in no way inhibit growth.

Gibberellic Acid

Gibberellic Acid is an example of one of the gibberellin family. Regardless of genotype (tall or small plants), more gibberellin equals more lateral growth.

Gibberellins and Germination

Gibberellins are responsible for promoting growth in the embryo of a seed. It does this the following way

  • Gibberellin released by the embryo travels towards the aleurone layer, its target tissue situated in the endosperm region of the seed (alongside the embryo).
  • Gibberellin acts as the inducer, as its presence allows the enzyme induction of amylase, which can break down starch INTO a sugar to be used in the embryo.
  • Sugar is used in the plant to synthesize proteins and break out of dormancy.

Gibberellins initiate this process in Summer, when the external environment exhibits favorable conditions for plant growth.

The previous tutorial has investigated the auxin family hormones involved in plant growth. The next tutorial investigates the sites of this growth, the meristems.

Biology Tutorials > Control of Growth & Development > Gibberellins and Gibberellic Acid

You will also like...

Darwin's Finches - Natural Selection
Darwin’s Finches & Natural Selection

Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

Salmon jumping upstream in the river
Lotic Communities & Animals

A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

"Opabinia regalis"
The Evolutionary Development of Multicellular Organisms

Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

Physical growth
Physical Development in Humans

This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..

mRNA
Protein Synthesis

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..