In this case, the messenger is the plant hormone cytokinin. This hormone is formed in the roots and passes through the veins to the part of the plant that is above ground. If there is a large ...

Plant hormones, also known as phytohormones ... the substrate binding and transport mechanisms of the plant purine/cytokinin transporter AZG2. Conformational dynamics were examined by determining ...

“Stem cell activation by light guides plant organogenesis,” Genes Dev ... enough light can penetrate to activate growth hormones. The authors looked at two hormones—cytokinin and auxin—known to react ...