Response of chlorophyll fluorescence characteristics of Populus euphratica heteromorphic Leaves to high temperature Changes of Endogenous Abscisic Acid and the Effent of Exogenous ABA onPollen Germination under Heat Stress Tomato Changes of Endogenous Abscisic Acid and the Effent of Exogenous ABA onPollen Germination under Heat Stress Tomato Effect of Heat-Stress during Meiosis on Grain Yield of Rice Cultivars Differing in Heat-Tolerance and Its Physiological Mechanism Effect of High Temperature during Heading and Early Grain Filling on Grain Yield of Indica Rice Cultivars Differing in Heat-Tolerance and Its Physiological Mechanism A Simple Method to Evaluate the High Temperature Tolerance of Celosia cristata The Different Changes of Endogenous Polyamines in Tomato Plants th DifferentHeat-tolerance under High Temperatures The Different Changes of Endogenous Polyamines in Tomato Plants th DifferentHeat-tolerance under High Temperatures Induction of Autotetraploid Non-heading Chinese Cabbage with High-quality and Heat-tolerance by Colchicine Analysis of heat tolerance in Poa pratensis produced by heat stress