Abstract: Based on olive(variety Frantoio) annual seedlings as test materials,spraying 66.7 mg/L(PP₃₃₃) on the surface of olive seedling leaves,each spraying quantity to 100 mL,and setting a contrast respectively(spraying the same amount of distilled water),then stop water,drought stress were taken 0,2,and 7 days of olive leaves for the determination of the physiological and biochemical indexes and comparative analysis,in order to explore the influences of PP₃₃₃ on olive seedling leaves' cell membrane protective systems under drought stress were studied in this paper.The results showed that cell membrane was damaged significantly under drought stress(stop watering 7 d),but spraying PP₃₃₃ on the olive seedling leaves significantly reduced the damage degree of the cell membrane,the data showed that its cell membrane's stability index was 41.5% higher than the contrast(the same amount of distilled water sprayed on the leaves) after stop watering 7 d.The results also showed that spraying PP₃₃₃ on olive seedling leaves relatively reduced the reducing range of chlorophyll content and carotenoid content,increased the content of proline and soluble sugar significantly,further improved the activity of SOD,POD and CAT,inhibited the increasing range of MDA content,O₂^{- ·}producing rate and H₂O₂ content,and even improved the content of the two kinds of important antioxidants(Vc and reduced glutathione) under the drought stress significantly.So it can be concluded that through improving the activity of antioxidant enzymes,enhancing the content of antioxidants and osmotic regulation substances,reducing the decline of photosynthetic pigment content and the accumulation of active oxygen and free radicals,spraying PP₃₃₃ on the olive seedling leaves promoted the protection on the cell membranes of olive seedling leaves under the drought stress.

Key words: PP₃₃₃, Olea europaea, Drought stress, Cell membrane, Resistance

CLC Number: 

• S567.7