Effects of different relative humidities on physiological activities of wild grape

Researches on the water potential，transpiration rate，electric conductivity，stomatal aperture，proline and SOD and POD and MDA contents changes in V.pseudoreticulata and Rizamat leaves at 30℃ under 5 atmospheric relative humidities（60%，70%，80%，90%，100%）show that with relative humidity rising，the water potentials of V.pseudoreticulata and Rizamat increase；the transpiration rate，electric conductivity，POD and MDA contents decrease；SOD and proline contents raise first，then drop；SOD and proline contents are at the lowest when V.pseudoreticulata in the relative humidity of 80%～90%，Rizamat in the relative humidity of 70%～80%，indicating that this relative humidity should be suitable to their growth.