👉 Phytokininin is a plant hormone that plays a crucial role in the growth and development of plants. It's also known as "vitamin B3" or "vitamin B5". Specifically, it has been found to play a key role in the regulation of plant growth, development, and maintenance of vegetative tissues. Phytokininin is an essential molecule for the synthesis of growth factors such as cytokinins, which are involved in the signal transduction pathways that control plant growth