From Facts and False Routes: How Plant Hormone Research Developed

Abstract

Our understanding of how plant hormones work has tremendously increased over the last decades. However, such progress was not possible without those who laid the foundation of the work which was sometimes much more tedious in early days than today. Therefore, we thought it timely to follow-up on historical aspects of plant hormone research. The development in the field of auxins, cytokinins, gibberellins, abscisic acid, jasmonates, brassinosteroids, and ethylene are accompanied with personal recollections. Plant hormones cannot go without plant growth regulators which have been developed for commercial reasons, but are also used in many cases nowadays as tools to investigate a specific role of a hormone in planta. This issue is also hopefully a useful collection for those scientists who want to get an overview of how their ''favorite hormone'' started.

Interkingdom Hormonal Regulations between Plants and Animals Provide New Insight into Food Safety

“…Nitric oxide (NO) is a widely known nitrogen oxide and free radical gas, which was first identified as a unique diffusible molecular messenger and the endothelial relaxing factor in animals. , As early as 1992, NO was recognized as one of the most critical plant signals that regulates cell death and defense under biotic and abiotic stresses in plants. , In this study, we classify nitric oxide as a plant hormone based on previous research and its physiological role in plants, ,, which is consistent with the definition of plant hormones …”

“…In this study, we reviewed the physiological effects of phytohormones in animals regulated by phytohormones. We determined whether a substance is a plant hormone by the revealed evidence for its biosynthesis, degradation, conjugation, transport, receptor(s), signal transduction, and physiological effect(s). , Our review demonstrated that the consumption of phytohormones is a double-edged sword. Excessive use of these can lead to possible food safety issues.…”

“…98,101 In this study, we classify nitric oxide as a plant hormone based on previous research and its physiological role in plants, 12,102,103 which is consistent with the definition of plant hormones. 13 A wide range of NO effectiveness in human cells has also been gradually revealed. NO system has been shown involved in cortisol-induced hypertension in humans, which implicated regulations in human sport systems.…”