The Five "Classical" Plant Hormones.

The Five "Classical" Plant Hormones.

It is 60 years since Went and Thimann (1937) published their classic book Phytohormones. At that time, the term phytohormone was synonymous with auxin, although the existente of other phytohormones, such as cell division factors, was anticipated on the basis of physiological experiments. It is impressive that aside from some confusion about the structure of auxin, many of the basic phenomena of...

New interactions between classical plant hormones.

Research on the classical plant hormones continues to uncover fascinating interactions between these crucial regulatory compounds.Recent papers describe ‘crosstalk’ between the abscisic acid and ethylene signaling pathways in Arabidopsis, and how the nature of this interaction depends on organ type.Auxin has now been shown to promote the biosynthesis of active gibberellin in pea,by up-regulatin...

Plant hormones

Plant hormones have been studied for more than a century because they have been heavily implicated in the control of plant growth and development. For many years, they have been considered to fall into five classes: auxins, cytokinins, gibberellins, abscisic acid and ethylene. More recently, a variety of additional classes such as brassinosteroids have been added and it seems likely that more w...

Plant hormones: Dissecting the gibberellin response pathway

Plant development is amazingly plastic — for example, identical pine seeds can give rise to a majestic tree in a forest or a scraggly bush on a rocky cliff. How is plant growth and development regulated so as to be capable of achieving such dramatically different endpoints? One factor that has emerged as a key regulator of plant form is gibberellin (GA; see Figure 1 inset for the chemical struc...

Microbial Production of Plant Hormones