| Strawberries (Fragaria ananassa Duch. cv. Camarosa) were exposed with two levels of light intensity (normal light intensity, shading treatment)for one week. At the same time, Camarosa strawberries used as materials to test that the effect of plant growth regulator on the physiology in different concentration of sodium salicylate (Na-SA) (0.05 mmol/L, 0.1 mmol/L, 0.2 mmol/L) under different light intensity.The following results that the influence of poor light stress on the content of photochrome, the soluble protein and the activities of membrane protecting enzymes of strawberries in greenhouse was studies by whole-tree shading.Compared with unshaded control, the net photosynthesis rate of strawberry leaves under poor light stress were remarkably lower. In contrast, there was an increase of the content of soluble protein and the content of Chla, Chlb of strawberry leaves, The activity of membrane-protecting enzymes were affects by shading: the activity of POD increased when light intensity decreased, the activity of CAT and SOD showed the opposite trend. A remarkable increase of MDA, a product of membrane-lipid peroxidation, was also observed in strawberry leaves. The content of MDA of strawberry leaves which were sprayed Na-SA had higher than those without Na-SA application. This indicated that Na-SA can decrease the level of membrane-lipid peroxidation. |
