Effect On Pigment Formation Of Leaf In Plum Of Different Species Under Dry Stress And Shading Condition

The paper takes ChangLi 15 in green leaf and Purple leaf plum in colorful leaf as materials, analyzes the change rule of photosynthetic pigment content, flower pigment content, PAL activity, soluble sugar content, leaf pH value with two species of different colorful leaf under water stressand shading condition, The results can be summarized as follows:1. The Photosynthetic pigment content is decreased under water stress condition. But thesensitive extent under water stress are differences in different photosynthetic pigment species andbreed, cha+b is larger than carotinoid, damage of ch b caused by water stress is more than that ofch a in the species, compare with the ck, ch b is decreased 32.9% and 37.7% of two species whenHeavy degrees of forces, Purple leaf plum' s sensitivity caused by water stress are more thanChangLi 15. But the results of shading condition are contrary to that under water stress, that is, cha and ch b, carotinoid and cha+b content are all increased, this is the reaction for trunk of tree tosuit the week light.2. Under water stress condition, ch a/b of plums are increased, so say that the damage of ch bcaused by water stress is more than that. of ch a, and value of cha+b/ carotinoid and cha+b/flower pigment are both reduced in ChangLi 15 and Purple leaf plum, the color of the leaf is moreobvious; Under shade environment, ch a/b is reduced. It shows that increased range of ch bcontents is bigger. And value of cha+b/ carotinoid and cha+b/ flower pigment is increased, thecolor of the leaf is went to green. So the effect on color of the leaf is the ratio variety of cha+b andflower pigment under water stress and shading.3. Under water stress condition, flower pigment content and soluble sugar content and PALactivity of two species are obviously increased, and pH value is gradually reduced. The rule ofPAL activity and flower pigment contents is not at the same time. This shows that the increasedflower pigment contents of Purple leaf plum are related to PAL activity, but the PAL not the onlyregulatory enzyme of flower pigment composite. While under shade environment, contents offlower pigment content and soluble sugar content and PAL activity of two species are all graduallyreduced, and the three is positive correlation. Say that the formation of the flower pigment iscorrelation to PAL. So under different condition, the formation of the flower pigment is different.4. With the study of Photosynthetic pigment under water stress and shading, that shows theendurance of drought ability, ChangLi 15 is higher than Purple leaf plum, the endurance ofshading, Purple leaf plum is higher than Changli 15.5. The chlorophyll, ch a and ch b content of Purple leaf plum is reduced, flower pigmentcontent is increased, flower pigment and chlorophyll value is increased under water stress, madethe color of the leaf is more obviously. So make the soil water content of 50%～60% can enhancethe view and admire impact, while conserve and manage with gardens greenbelt growth.6. The chlorophyll, ch a and ch b content of Purple leaf plum is increased, flower pigmentcontent is reduced, flower pigment and chlorophyll value are reduced under shading, the leaf isgreen, make against the color of leaf. Try to improve transmittance is ensure when gardens match, then the view and admire of Purple leaf plum will big.