Effects of Endogenous Hormone Balance on Dormancy and Germination of Tiller Bud Mechanisms of Tiller Occurrence Affected by Exogenous IAA, GA3, and ABA in Wheat with Different Spike-types Effect of Plant Growth Regulators on the Growth of Rice Tiller Bud and the Changes of Endogenous Hormones Studies on the Sensitive Stage to Environment during Differentiation and Development of Tiller Buds in Rice Plant