Simulation of Growth and Hydrotropism of Maize Roots Effects of Exogenous Calcium and It′s Related Substances on Scattering-planted Rice Seedlings′ Bending Upward Adaptive Changes and Genotypic Variation for Root Architecture of Common Bean in Response to Phosphorus Deficiency Phylogeny and evolution of charophytic algae and land plants EFFECT OF LIGHT ON GRAVITROPIC RESPONSE OF RHIZOIDS OF GAMETOPHYTES OF FERNS An Overview of the Biology of Reaction Wood Formation Control of Negative Gravitropism and Tension Wood Formation by Gibberellic Acid and Indole Acetic Acid in Fraxinus mandshurica Rupr. var. japonica Maxim Seedlings Role of GA3, GA4 and Uniconazole-P in Controlling Gravitropism and Tension Wood Formation in Fraxinus mandshurica Rupr. var. japonica Maxim. Seedlings