Studies on Drought Resistance of Different Regional Amygdalus pedunculata Pall.

Amygdalus pedunculata Pall. seedlings with one year of growth from Hebei,Wushenqi, Shenmu, Guyang and Yuyang regions were selected as test materials.We obtained leaf anatomical structure characteristics and physiological and biochemical characteristics under drought stress to determine drought resistance. Results showed that: (1) There were significant differences in leaf anatomical structures under water stress, and according to membership function, the sequence of drought resistance was Yuyang area>Shenmu area>Guyang area>Wushenqi area>Hebei area.(2) With the extension of stress time and degree of drought stress, leaf RWC, plasma membrane permeability and MDA showed an upward trend, and the change range of weak drought resistance was larger. Both SOD and POD activity, free proline and soluble protein content with the strengthening of stress increased first then decreased (later or directly), and the stronger the drought resistance the higher the activity or content.(3) Under water stress the contents of chlorophyll a and b also increased at first and then decreased, and the response of chlorophyll b to drought stress was more sensitive than chlorophyll a. But Car showed a downward trend, and among them Yuyang and Shenmu areas were highest after 40 days. By adjusting leaf structure, physiological and biochemical characteristics, A. pedunculata Pall. reduced the harm caused by water stress,and according to comprehensive analysis of the indicators, the sequence of drought resistance of the five regions A. pedunculata Pall.was Yuyang area>Shenmu area>Guyang area>Wushenqi area>Hebei area. This research lays a foundation for further breeding, and provides a theoretical basis for the industrialization development of Amygdalus pedunculata Pall.