Evaluation of drought resistance and analysis of physiological index variation for different Chinese Iris populations Research on Physiological Characteristics of Salt Resistance in Iris lactea var.chinensis Study on the Suitable Pre-treatment for Seed Germination of Iris(Iris lactea Pall. var. chinensis(Fisch.)Koidz) Technological System of Tissue Culture and Rapid Propagation of Iris lactea Pall. var. chinensis(Fisch.) Koidz. Isozyme Analysis of Different Chinese Iris Populations Effects of Pb on growth, heavy metals accumulation and chloroplast ultrastructure of Iris lactea var. Chinensis Establishment and Optimization of ISSR-PCR Reaction System for Iris lacteal THE CHLOROPLAST DNA VARIATION OF Iris lactea FROM DIFFERENT RESOURCES Relationship Between the Leaf Tissue Characteristic and Drought Resistance of Iris lactea Pall. var. chinensis(Fisch.) The Comparison of Drought Resistance on 15 Chinese Iris Germplasm at Seedling Stage Physiological characteristics of photosynthesis in Iris lactea Pall. var. chinensis (Fisch.) Koidz grown in salt and alkali soil