Effect of Low Potassium Stress on Gene Expression Profile in Leaves of Tobacco Seedlings EFFECTS OF LOW POTASSIUM STRESS ON PHOTOSYNTHETIC CHARACTERISTICS AND ANTIOXIDANT SYSTEMS IN DIFFERENT POSITION LEAVES OF RICE PLANTS Some agronomic and nutritional characteristics for potassium efficient rice genotypes under low potassium stress Overexpression of Millet Transcription Factor Gene SiNAC45 to Response of Low Potassium Stress and ABA Treatment in Transgenic Arabidopsis Screening and Evaluation Indicators for Low Potassium-Tolerant and Potassium Efficient Sweetpotato (Ipomoea batatas L.) Varieties (Lines) Physiological Characteristics of Delaying Leaf Senescence in Maize Inbred Lines Tolerant to Potassium Deficiency Changes in Reactive Oxygen Species and Antioxidative Defense Mechanism in Tomato Leaves under Low Potassium Stress Screening Cut Chrysanthemum Varieties in Low Potassium Tolerant and Patience Physiology in Seedling Screening Cut Chrysanthemum Varieties in Low Potassium Tolerant and Patience Physiology in Seedling