Prelimnary Study On The Physiological Response Of Seriphidium Transiliense Under Different Defoliation Intensities

This paper investigates the representative plants of the sagebrush desert as Seriphidium transiliense were determined. In order to reasonable utilize, renovate and develop continuely sagebrush desert of spring-autumn. Determined the changes on chlorophyll, carbohydrate, osmotic adjustment substance and discussed the physiological response mechanism and dynamic change law of S. transiliense under different defoliation intensities.The main results were as the followed:1. After defoliation intensities, the contents of chlorophyll-a and chlorophyll-b in leaves of S. transiliense were reduced under different defoliation intensities. During the growing season, the contents of chlorophyll-a and chlorophyll-b were higher under light-defoliation and middle-defoliation, and were lower under high-defoliation.2. The contents of soluble sugar in roots, stems and leaves of S. transiliense have been falling after different defoliation intensities in autumn. During the growing season, the contents of soluble sugar in leaves and roots were higher under the light-defoliation and middle-defoliation; the soluble sugar in stems is highest in CK; the soluble sugar in roots, stems and leaves of S. transiliense were lowest under the high-defoliation.3. The deoxidizing sugars in leaves and roots of S. transiliense were higher under the light-defoliation and middle-defoliation; the deoxidizing sugars in stems was highest in CK; the deoxidizing sugars in roots, stems and leaves of S. transiliense were lowest under the conditions of high-defoliation.4. The contents of carbohydrate of S. transiliense were as: starch>soluble sugars>deoxidizing sugars. The starch is main storage substance in S. transiliense. During the growing season, the starch contents of leaves, stems and roots under high-defoliation were the lowest than other defoliation.5. The contents of soluble protein in leaves and stems of S. transiliense have increased after different defoliation intensities in spring and autumn, and the contents of soluble protein in roots have increased after different defoliation in autumn. The soluble protein in leaves of is higher in CK; it is higher in stems and roots under the light-defoliation; the soluble protein in leaves, stems and roots of S. transiliense were lowest under the high-defoliation.6. The proline contents of S. transiliense declined after different defoliation intensities. The proline contents in leaves of S. transiliense increased with defoliation intensities, while the proline contents in stems and roots decrease with the increase of defoliation intensities.7. The amino acid contents in roots of S. transiliense were lower than that in leaves and stems. The amino acid contents in leaves and roots of S. transiliense were higher under the light-defoliation and middle-defoliation; the amino acid content was the highest in stems of CK, and it was the lowest in leaves, stems and roots under the high-defoliation.