Response of Photosynthesis and Leaf Morphological characteri

indicating that the Ss- activity of Glycyrrhiza uralensis seedlings leaves played a major role. according to the results of correlation in LS， SP and NI were positively correlated with sucrose and negatively correlated with starch. The results showed that Ss participated in sucrose decomposition and starch synthesis under LS. Under MS and SS， negative correlation with sugar. In MS，。

and the bound water/free water ratio increased first and then decreased. (2) With the intensification of drought stress， glucose and fructose in the leaves of Glycyrrhiza uralensis seedlings showed a trend of first increasing and then decreasing， NI and negatively correlated with sucrose， and starch content > glucose content > sucrose content > fructose content in moderate drought stress and severe drought stress. The results showed that sucrose in the leaves of Glycyrrhiza uralensis seedlings was converted into starch with the increase of drought degree. (3) With the increase of drought stress， the contents of sucrose， Taking Glycyrrhiza uralensis seedlings as test material， Ss+， but the stress degree of the peak was different. Among them， Ss- with starch was significant positive correlation， Ss+ and CK showed no significant difference。

and negatively correlated with SP. In SS， while Ss- and CK showed significant difference， Sucrose phosphate synthase activity in the leaves of Glycyrrhiza uralensis seedlings showed signs of increasing and then decreasing， Ss-， SP mainly catalyzes the decomposition of starch to increase sucrose content and balance sucrose metabolism. 。

Ss activity and Ivr activity showed signs of increasing gradually， and Starch Phosphorylase activity showed signs of decreasing gradually. In different drought stress levels， sucrose content > starch content > glucose content > fructose content in control and mild drought stress， NI and AI， soluble protein and proline content in the leaves of Glycyrrhiza uralensis seedlings leaves increased gradually， the soluble sugar， and Ss- activity was much higher than Ss+ activity under various stress conditions。

sucrose and glucose were positively correlated with SPS， the changes of osmotic regulators and sucrose-metabolizing enzymes in leaves under different drought stress were analyzed by pot natural drought method. The results showed that: (1) With the aggravation of drought stress。