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Having high plasticity for cell differentiation is one central characteristic of plant cells.

Plants generate unorganized cell masses, such as callus or tumors, in response to stresses, such as wounding or pathogen infection.

Plants develop unorganized cell masses like callus and tumors in response to various biotic and abiotic stimuli.

Since the historical discovery that the combination of two growth-promoting hormones, auxin and cytokinin, induces callus from plant explants in vitro, this experimental system has been used extensively in both basic research and horticultural applications.

This little studied process differs from cold-induced sweetening in that it is promoted by storage at higher temperatures and unlike cold sweetened potatoes, tubers that have undergone the senescent sweetening process cannot be reconditioned.The molecular basis of callus formation has long been obscure, but we are finally beginning to understand how unscheduled cell proliferation is suppressed during normal plant development and how genetic and environmental cues override these repressions to induce callus formation.In this review, we will first provide a brief overview of callus development in nature and in vitro and then describe our current knowledge of genetic and epigenetic mechanisms underlying callus formation.Recent investigations have revealed many other direct actions of EGCG that are independent from anti-oxidative mechanisms.In this review, we discuss these novel molecular mechanisms of action for EGCG.

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