Chromosome technique of root tips and anther callus in Zinnia elegans Effect of Uniconazole on Photosynthetic Characters and Leaf Anatomical Structure of Zinnia Seedlings under Water Stress Downregulation of the Basic Peroxidase Isoenzyme from Zinnia elegans by Gibberellic Acid Effects of salicylic acid on seed germination and seedling physiological characteristics of Zinnia elegans under salt stress