Hormones Hormones contribute greatly to the growth of plants. Hormones such as auxins, gibberellins, cytokinins, and inhibitors make plants start growing through stimulation, have protein synthesis, maintain growth, and also inhibit plant growth, respectively. Hormones, very simply, control the plant s instincts to grow. Auxins also make roots grow and make the veins in leaves grow. Tropisms, which are discussed later, in conjunction with auxins, make the plant grow in the proper direction.
Gibberellins are the leaves and roots that form in the baby plant seed.
Gibberellins are also responsible for protein synthesis, which is the building of protein for basic life purposes. Gibberellins are used commercially to promote flowering and fruit development because of their growth stimulation. Cytokinins are a group of natural plant chemicals found in endosperms, the nutritive tissue of embryonic seeds, and in the development of fruit. The cytokinin zeatin, in conjunction with auxins, stimulates cell division, particularly for shoot growth. Cytokinins also maintain cell growth, differentiation, and division.