Effect of drought stress using PEG-6000 on the growth and osmotica of Sedum lineare Physiological responses of Coleus blumei to simulated drought stress Physiological Characteristics and Gene Mapping of a Leaf Early-Senescence Mutant osled in Rice Combining Ability and Genetic Effects of Germination Ability in Different Brassica napus L. Cultivar under Simulated Drought Stress