Plant Growth and Hormones

NAA (Naphthaleneacetic acid) is a synthetic auxin used to prevent premature fruit drop and promote fruit thinning.

Cytokinins are plant hormones that promote cell division and are essential for inducing shoot formation (morphogenesis) in plant tissue culture.

Auxin transport in plants is polar, specifically moving from the shoot tip downwards toward the roots, which is known as basipetal transport.

Garner and Allard are famous for their pioneering research on photoperiodism, which is the physiological response of organisms to the length of day or night.

It is a type of condensation reaction, in which, monomers join together into polymers, while losing water molecules. This process is carried out, by losing from one of the monomers and (H) from another monomer. The two unstable monomers join together, and they combine forming water. When small organic sugar molecules are chemically joined, a water molecule must be removed.

The function of meristematic tissues is regulated by both gibberellins and auxins.

Kinetin is part of a group of similar plant hormones, called cytokinins. Its primary role is to extend plant life by promoting cell division and cell enlargement. It is also involved in apical dominance. Kinetin is also called 6-Furfurylaminopurine.

The Richmond-Lang effect refers to the delay of senescence in detached leaves by the application of cytokinins. Kinetin is a well-known synthetic cytokinin.

The Avena curvature test is the classic biological assay used to detect and quantify the presence of auxins based on the growth response of oat coleoptiles.

Gibberellins are plant hormones known for promoting stem elongation, which can overcome genetic dwarfism in certain plant varieties.

Ethylene is a gaseous plant hormone that promotes fruit ripening. It is commercially used to accelerate this process in harvested fruits.

Common cytokinin of tissue culture is Benzylaminopurine.

2,4–D is a synthetic plant hormone. It is a synthetic auxin (plant hormone) and one of the most widely used herbicides in the world.

Cytokinins are known to delay senescence in leaf tissues and promote mitosis. Cytokinins act in concert with auxin, another plant growth hormone. The two are complementary, having generally opposite effects.

Gibberellic acid is the hormone which promotes internodal elongation. It can stimulate rapid stem and root growth, induce mitotic division in the leaves of some plants and increase seed germination rate.