basis of cytokinin activity and its role in senescence was established
[20–22]. Following the discovery of an isopentenyltransferase gene
(IPT) from Agrobacterium tumefaciens and its role in cytokinin
biosynthesis [23], efforts were made to express this gene to upregulate
the production of cytokinin to delay senescence [24,25].
Dexamethasone-inducible overexpression of the Agrobacterium
tumefaciens IPT leads to higher de novo cytokinin biosynthesis in
transgenic Arabidopsis plants