Inter-individuality and plant hormones. Commentary on systems, variation, individuality and plant hormones

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...

Microbial Production of 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...

Individuality and stability of nocturnal secretion patterns for eight hormones in healthy young men

Six young males, 20 to 30 years of age, were included in a protocol where repeated blood sampling was carried out over a whole night, from 20:00 to 08:00. They were considered to be healthy on the basis of their physical and psychiatric medical history, and physical examination. Routine laboratory blood tests were performed before inclusion in the study; all values were in the normal range. The...

Plant hormones are versatile chemical regulators of plant growth.

The plant hormones are a structurally unrelated collection of small molecules derived from various essential metabolic pathways. These compounds are important regulators of plant growth and mediate responses to both biotic and abiotic stresses. During the last ten years there have been many exciting advances in our understanding of plant hormone biology, including new discoveries in the areas o...