For studying the flower physiology of pitaya plants (Hylocereus sp.), determining the maturity of current shoots is essential. N-(2-Chloro-4-pyridyl)-N′-phenylurea (CPPU), a synthetic cytokinin, functions as a competitive inhibitor of cytokinin oxidase and was used to amplify the function of endogenous cytokinins. Spraying 100 mg•L⁻¹ CPPU on the current shoots of different ages 7.5 weeks after the spring equinox (WASE) may result in budding within 1 week. In our study, typical floral buds emerged on the mature shoots but not immature shoots. Furthermore, the critical shoot age for the pitaya plant to be competent for receiving long day length stimulus at spring equinox was line between 13.5 and 15.5 weeks of pre-growth. Application of CPPU to the shoot older than 1 year at 5.5 WASE resulted in precocious flowering by 2 weeks.

为了研究火龙果 ( Hylocereus sp.)的花生理，确定当前枝条的成熟度是必不可少的。N-(2-Chloro-4-pyridyl)-N'-phenylurea (CPPU) 是一种合成的细胞分裂素，可作为细胞分裂素氧化酶的竞争性抑制剂，用于放大内源性细胞分裂素的功能。喷涂 100 mg•L ^-1春分后7.5周（WASE）对不同年龄的新梢进行CPPU处理，可能导致1周内出芽。在我们的研究中，典型的花芽出现在成熟的枝条上，而不是未成熟的枝条上。此外，火龙果植物能够在春分时接受长日照刺激的临界枝条年龄在生长前的 13.5 至 15.5 周之间。在 5.5 WASE 时将 CPPU 施用于 1 年以上的枝条导致 2 周的早熟开花。