Effects of NAA and TDZ on direct embryo formation
from leaf explants of Phalaenopsis amabilis. The frequency of
embryo-forming explants and the mean number of embryos per
explant were scored after 45 d of culture. Means of 32 replicates
(explants) with the same letters are not significantly different at
P ≤ 0.05 (Duncan 1955).