| The changes of chlorophyll and MDA content in the functional leaves of ombrophilous maize cultivars, which was grown in the Hoagland Nutrients with different S concentration, have been measured after the 3-leaf period under drought stress which was stimulated by using PEG-6000. The results show that the S supply play an important role in increasing the content of chlorophyll. With the increase of S concentration in the Nutrients, the content of chlorophyll in the funtional leaves is raised, and most probably there exists a concentration threshold; Drought stress clearly causes the decrease of the chlorophyll, however, this effect may be inhibited by increasing S in the Nutrients; The chlorophyll content can be recovered to some extend after rewatering, which is evidently affected by S nutrition; Drought stress causes the increase of MDA in leaves, but the MDA content in the plants with S nutrition is obviously lower than that without S, showing that S may have a function in lightening the membrane damage caused by drought. |