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Adventitious shoots can be regenerated from the cut surface of the primary shoot and lateral branches in decapitated plants in vivo. This inherent regenerative ability of plants is useful for mass propagation. In the present study, we conducted histological observations of shoot regeneration and applied auxin and cytokinin to decapitated seedlings in four tomato cultivars. The cultivars produced different numbers of adventitious shoots after decapitation; 'Petit' produced the largest number of adventitious shoots (78.5 ± 10.2) and 'Momotaro' produced the fewest (12.1 ± 3.3). Histological observation of 'Petit' revealed that adventitious shoots regenerated from calli formed at the cut surface of stems. Adventitious shoot formation was inhibited by the presence of lateral branches. Shoot regeneration was prevented by application of 1-naphthaleneacetic acid to 'Petit'. Application of 6-benzyladenine promoted shoot regeneration in 'Momotaro'. These results suggest auxin synthesized de novo from the lateral branches inhibited shoot regeneration after decapitation and endogenous cytokinin might stimulate shoot regeneration. Chemical names: 1-naphthaleneacetic acid (NAA); 6-benzyladenine (BA)

Effects of Auxin and Cytokinin on In Vivo Adventitious Shoot Regeneration from Decapitated Tomato Plants