Effects of soil moisture on physiological characteristics and the dynamic state of factors causing photosynthesis decline in potted tomato leaves in green house Effects of Exogenous 24-Epibrassinolide on Growth and Photosynthesis of Tomato Seedlings under Low Light Stress STOMATAL AND NON-STOMATAL LIMITATION OF THE FLUE-CURED TOBACCO UNDER WATER STRESS AT VIGOROUS GROWING STAGE The Photosynthetic Response of Atriplex triangularis to Salt-shock under Varied Light Intensity