The Impact Of Under Different Ecological Conditions Of Drought Stress On Physiological Indicators And Anatomical Structures Of Prunus Mongolica

This experiment for many years of the western part of Daqingshan Baotou City Salaqi jiufengshan and Huhhot arboretum's wild Prunus mongolica as the test material, through natural precipitation caused drought stress directly in accordance with the natural plant growth conditions to assess this variety's drought resistance, and can truly reflect the plant drought resisting ability size in different regions. Experiment after continuously the 2d rainfall the second day sampling for the comparison (arid 0d, namely CK), take continued the sampling which cloudless day 5d,10d,15d picked as each processing, system researched the two kind of ecological environment condition Prunus mongolica many physiological biochemistry target content change as well as leaf and root anatomical structure observation under the drought stress. The main conclusions are as follows:1.In the two kind of ecological environment condition, the Prunus mongolica along with drought stress time's extension and the degree aggravation, leaf relative water content assumes the declining trend, while degree of water deficit upward trend; chlorophyll a, chlorophyll b and total chlorophyll content both the overall downward trend; proline accumulation increased significantly; the accumulation of soluble sugar is also increased; soluble protein content increased; sorbitol content increased; leaf membrane permeability of the injury rate and MDA content With the drought stress was First increased and then decreased; leaves of PAL and C4H activity Strengthens gradually. Comprehensive analysis shows that Prunus mongolica growth in the Salaqi has a strong drought resistance than the Huhhot Arboretum.2.From the Prunus mongolica of Salaqi sampling, with drought stress time's extension and the degree aggravation,and its mesophyll upper and lower epidermal cells with changes small and arranges compact ; The Palisade tissue is extremely developed, arranges closely, the cells become longer and the layer also gradually increases; The Spongy tissue cells also gradually increases, the intercellular space changes small and arranges compact.In its mesophyll cells starch-grains accumulation quantity along with drought stress time's extension, but drops gradually. Prunus mongolica new roots with the endodermis cells occurred thicken phenomenon along with the drought stress degree's aggravation.