tPurslane (Portulaca oleracea L.) is a herbaceous fleshy plant, which is relatively more tolerant to droughtthan other species. So far, there is little information on the combined response of this plant to drought andrehydration. In this study, physiological changes were measured under drought stress and rehydrationconditions in purslane. Soil water content (SWC), leaf water content (LWC), malondialdehyde (MDA),proline, electrolyte leakage (EL), chlorophyll content, O2？？, SOD and POD activities were determined atdesignated time periods (5 d, 10 d, 15 d, 22 d after drought and 3 h, 1 d, 3 d after rehydration). Progressivedrought treatment for 10 d significantly increased MDA, proline, EL, O2？？, and activities of SOD and POD,while rehydration for 1–3 d caused decline of these parameters. Conversely, drought stress decreased LWCand chlorophyll content, while rehydration increased LWC quickly and chlorophyll content gradually. Thepresent study indicated that the purslane has a great capability to cope with drought stress and activatemany physiological mechanisms, which allow more efficient recovery during rehydration. These resultsprovided the first physiological evidences that the harvest time for purslane was within 5–10 d of droughtor 1–3 d after rehydration.
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