| The physiological indexes, plant growth and leaf organic morphology of grape plantlets in vitro under water stress induced by polyethylene glycal (PEG) with different concentrations have been observed and analysed. The results indicate that, under PEG treatment, the growth of plantlets is inhibited, the internode length and plant height are shortened, while the amount and length of roots are increased; the newly-developed leaves become smaller and crimple, their stomatal index is reduced, and the epidermal cells are collocated more closely; the proline accumulation and ABA content in leaves of the plantlets are raised rapidly. It can be concluded that a moderate drought stress may enhence the acclimation of grape leaves to water deficit by changing leaf ontogeny process, and that the accumulation of osmotic active matter may be certain physiological responses of grape to long-term water stress. |