The Relationship Between Flowering Induction and the Level of Adenosine Triphosphate in Pharbitis nil The Relationship Between Flowering Induction and the Changes of some Phosphatase Activities in Pharbitts nil Effect of Photoperiodic Induction on the Protein Synthesis of Cotyledons and the Morphology of Apical Meristem of Pharbitis nil Plant 长日照处理对牵牛开花抑制作用研究 Ⅰ.不同时间长日照处理对花芽分化和子叶蛋白质的影响