Effects of Plant Growth Regulation Substances on Photosynthetic Characteristics and Assimilates Transportation in Winter Wheat under Post-anthesis Drought and Waterlogging Boron Deficiency Causes Changes in the Distribution of Major Polysaccharides of Pollen Tube Wall Quantitative analysis of prolonged reproductive growth of the tillers of Puccinellia chinampoensis population in alkalized meadow in the Songnen Plains of China Regulation of Several Plant Growth Substances on Pine Shoot Growth and Their Effects on Shoot Pests Controlling Effects of different processing methods on Codonopsis pilosula seed germination and seedling growth THE GROWTH REGULATION OF GMELINA ARBOREA Research trend on regulating effect of laser pretreatment on plant growth