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The physiological acclimation of  Taxodium  hybrid ‘zhongshanshan 118’ ( T .118) plants to a progressive drought stress and drought-stressed to recovery treatment (DS-R) was investigated in this study. Plants of control (C) treatment were watered daily throughout the experiment. Results indicated that water deficit reduced stomatal conductance ( g  S ) to improve water use efficiency (WUE) and, as a consequence, net photosynthetic rate ( P  n ), transpiration rate ( T  r ), and intercellular CO 2  concentration ( C  i ) were also decreased in DS-R  T .118 plants compared with C plants. These reductions became more significant with decreasing soil water availability. Correlation analysis showed  g  S  was positively correlated ( P  &lt; 0.01) with the soil water content as well as leaf relative water content (RWC). There was a tendency to accumulate proline, malondialdehyde (MDA), antioxidases, and membrane electrolyte leakage as stress intensity increased. Moreover, drought stress induced significant ( P  &lt; 0.05) decline in total chlorophyll contents (Chl t ) and increase of nonphotochemical quenching (NPQ) on day 8 as a photo-protective mechanism. Cluster analysis distinguished the adaption of  T .118 plants to water deficit in two ways. First, photosynthesis was related to thermal dissipation, and second antioxidation was related to morphology and osmosis. Furthermore, tested parameters showed a reversed tendency and restored equivalently to C levels after 9 days of rewatering. These findings suggest that  T .118 plants demonstrated considerable tolerance to short-term drought stress and recovery due to a high degree of plasticity in physiological acclimation.

Physiological Acclimation of Taxodium Hybrid ‘Zhongshanshan 118’ Plants to Short-term Drought Stress and Recovery