species that showed effects of BAP [7, 12] and TDZ [13, 14]
on shoot multiplication of explants. Although BAP is more
commonly used, TDZ with cytokinin like activity [15] has
been reported to be more potent than most of the commonly
used cytokinins in tissue culture of many woody plants [16],
hence the justification for testing these two plant growth
regulators for tea clone Iran 100. Tea nodal segments cultured
on medium with BAP or TDZ gave different response. Our
result showed that TDZ was not as good as BAP because it
resulted in hyperhydricity. Hyperhydricity is a phenomenon
which has been reported to occur due to high concentra-
tions of cytokinins. Its occurrence is rather species specific
occurring easily in some species, such as Lavandula vera DC
[17], Malus sylvestris [18], and Vitis vinifera [19].