| 摘要: |
| 【目的】 研究化控处理对砂糖橘叶中氮素含量及成花数的影响，探讨叶中氮素含量与成花数的关系，为砂糖橘的花芽分化及成花的农艺控制和化控提供理论依据。【方法】 以喷施清水为对照（CK），对盆栽砂糖橘分别进行300 mg/L多效唑＋干旱胁迫（PDST0）、300 mg/L多效唑＋干旱胁迫＋1 000 mg/L硫脲(PDST1) 和300 mg/L多效唑＋干旱胁迫＋2 000 mg/L硫脲(PDST2)处理，于2008年的09-13（未处理期）、10-05（处理前期）、10-25（处理中期）、11-14（处理后期）、12-04（恢复管理期）、12-24（开花前期）采集样品，研究化控物质单用或混合使用对砂糖橘叶中氮素含量的影响及其诱导成花的效果。【结果】 全叶中氮素含量主要受叶片中氮素含量的影响；与对照相比，在处理前期和中期，化控处理可显著降低全叶中的氮素含量，但化控处理间差异不显著；在开花前期，CK、PDST0、PDST1、PDST2处理全叶中氮素含量分别比未处理期增加12.18%，5.58%，8.96%，9.74%；对照没有成花，化控处理均能诱导砂糖橘成花，但成花数差异不显著；在处理前期、中期和后期，全叶中氮素含量均与砂糖橘的每株成花数呈显著或极显著负相关。【结论】 多效唑＋干旱胁迫处理在降低砂糖橘叶中氮素含量和增加成花数方面具有很好的效果，无需再喷施硫脲；在花芽诱导过程中，全叶较低水平的氮素含量有利于砂糖橘成花。 |
| 关键词: 砂糖橘 氮素含量 成花数 |
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| 基金项目:国家自然科学基金项目（30671235）；广东省自然科学基金重点项目（06105477）；农业部“948”项目（2003 Z91） |
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| Effect of chemical treatment on nitrogen content and the number of flowering in shatangju(citrus.reticulate) |
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| Abstract: |
| 【Objective】 The experiment was conducted to test the impact of chemical treatments on the content of nitrogen in leaf,the number of flowering in Shatangju(citrus.reticulate),and the correlation analysis between them.Results of the research would provide useful information for flower bud differentiation,the agronomic and chemical control methords of flowering.【Method】 By comparing with the normal water treatment,the pot experiment was carried out respectively to use such matters as paclobutrazol＋drought stress (PDST0),paclobutrazol＋drought stress and 1 000 mg/L thiourea(PDST1),paclobutrazol＋drought stress and 2 000 mg/L thiourea(PDST2).On September 13,2008 (the period of untreatment),October 5 (beginning period of treatment),October 25 (middle period of treatment),November 14 (later period of treatment),December 4 (ending period of treatment),December 24 (beginning period of flowering),we collected samples to study the influence of the chemical substances used lonely or compound on the content of nitrogen in leaf and flower bud differentiation in Shatangju.【Result】 The nitrogen content in leaf was definitely influenced by the nitrogen content in blade;in the beginning and middle period,the nitrogen content in leaf of chemical treatments was significantly lower than that of CK,but the nitrogen content of chemical treatments had no significant differences at the same time.Before flowering,the nitrogen content of the four treatments increased by 12.18%,5.58%,8.96%,9.74% compared to those in the period of untreatment.The CK treatment didn’t flower,but the chemical treatments induced Shatangju to flower and there were no significant differences found among them on the number of flowering.The result of correlation analysis showed that significantly negative correlation existed between the nitrogen content in leaf and the number of flowering during beginning period,middle period and later period respectively.【Conclusion】 The paclobutrazol＋drought stress had significant influence on the nitrogen content and the number of flowering,but it was unnecessary to add thiourea. During the flower induction,the lower content of nitrogen in leaf could induce shatangju to flower. |
| Key words: Shatangju(citrus.reticulate) nitrogen content the number of flowering |
