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    李晨晞, 卫星, 汤静文, 程鑫, 刘净, 彭政淋, 苏安然, 苏嘉熙, 毋程琳, 吴纯泽. 水曲柳雌雄株叶片光合及化学计量特征对外源激素的响应[J]. 北京林业大学学报, 2023, 45(12): 80-89. DOI: 10.12171/j.1000-1522.20220335
    引用本文: 李晨晞, 卫星, 汤静文, 程鑫, 刘净, 彭政淋, 苏安然, 苏嘉熙, 毋程琳, 吴纯泽. 水曲柳雌雄株叶片光合及化学计量特征对外源激素的响应[J]. 北京林业大学学报, 2023, 45(12): 80-89. DOI: 10.12171/j.1000-1522.20220335
    shu
    Li Chenxi, Wei Xing, Tang Jingwen, Cheng Xin, Liu Jing, Peng Zhenglin, Su Anran, Su Jiaxi, Wu Chenglin, Wu Chunze. Response of photosynthetic and stoichiometric characteristics of female and male leaves of Fraxinus mandshurica to exogenous hormones[J]. Journal of Beijing Forestry University, 2023, 45(12): 80-89. DOI: 10.12171/j.1000-1522.20220335
    Citation: Li Chenxi, Wei Xing, Tang Jingwen, Cheng Xin, Liu Jing, Peng Zhenglin, Su Anran, Su Jiaxi, Wu Chenglin, Wu Chunze. Response of photosynthetic and stoichiometric characteristics of female and male leaves of Fraxinus mandshurica to exogenous hormones[J]. Journal of Beijing Forestry University, 2023, 45(12): 80-89. DOI: 10.12171/j.1000-1522.20220335
    shu

    水曲柳雌雄株叶片光合及化学计量特征对外源激素的响应

    Response of photosynthetic and stoichiometric characteristics of female and male leaves of Fraxinus mandshurica to exogenous hormones

      摘要
    • 摘要:
      目的  评估外源激素添加对水曲柳雌雄株叶片光合及化学计量的影响，阐明不同性别水曲柳间对不同激素配比组合的差异响应，为开展水曲柳精准化培育提供依据。
      方法  试验采用双因素四水平析因试验设计，以水曲柳成熟人工林雌株和雄株为试验对象，通过树干滴注法分别对雌株和雄株进行赤霉素（GA3）和细胞分裂素（6-BA）激素处理。测定雌株和雄株的光合参数、叶面积、叶绿素含量（SPAD）、叶片碳（C）、氮（N）含量和C/N值。
      结果  （1）雌株最优激素处理为A2B1（GA3 60 mg/L，6-BA 30 mg/L），叶片C含量明显提升，且叶片N含量、C/N值最高，叶面积和SPAD值显著提高（P < 0.05），净光合速率取得最高值。（2）雄株最优激素处理为A3B2（GA3 90 mg/L，6-BA 60 mg/L），叶片C、N含量均取得最高值，C/N值取得次高值，叶面积和SPAD值显著提高（P < 0.05），净光合速率取得最高值；（3）整体上，激素处理后雌株的光合和化学计量指标高于雄株。
      结论  水曲柳雌株在GA3 60 mg/L、6-BA 30mg/L，雄株在GA3 90 mg/L、6-BA 60 mg/L处理下，叶片的光合功能最优，叶片C、N含量显著提高。水曲柳雌株和雄株叶片光合及化学计量特征对外源激素种类、配比具有明显的差异响应。

       

      Abstract:
      Objective This paper aims to assess the effects of exogenous hormone addition on the photosynthesis and stoichiometry of male and female Fraxinus mandshurica leaves, elucidate differential responses to different hormone ratio combinations between male and female Fraxinus mandshurica, and provide a basis for precision breeding of Fraxinus mandshurica.
      Method The experiment utilized a two-factor, four-level fractional factorial experimental design, with mature female and male F. mandshurica trees from artificial forests as the test subjects. Gibberellin (GA3) and cytokinin (6-BA) hormone treatments were administered separately to female and male trees through stem drip method. The photosynthetic parameters, leaf area, chlorophyll content (SPAD), leaf carbon (C), nitrogen (N) content, and C/N ratio of female and male trees were measured.
      Result (1) The optimal hormone treatment for female trees was A2B1 (GA3 60 mg/L, 6-BA 30 mg/L), which significantly increased leaf C content, and had the highest leaf N content and C/N ratio, as well as significantly increased leaf area and SPAD value (P < 0.05), achieving the highest net photosynthetic rate. (2) The optimal hormone treatment for male trees was A3B2 (GA3 90 mg/L, 6-BA 60 mg/L), which achieved the highest leaf C and N content, the second highest C/N ratio, significantly increased leaf area and SPAD value (P < 0.05), and the highest net photosynthetic rate. (3) Overall, the photosynthetic and stoichiometric indicators of female trees were higher than those of male trees after hormone treatment.
      Conclusion Female F. mandshurica trees have optimal photosynthetic functionality with GA3 60 mg/L and 6-BA 30 mg/L treatment, while male trees show optimal photosynthetic functionality with GA3 90 mg/L and 6-BA 60 mg/L treatment. Leaf carbon (C) and nitrogen (N) content are significantly increased under these treatments. The photosynthetic and stoichiometric characteristics of female and male Fraxinus mandshurica leaves show significant differential responses to the type and ratio of exogenous hormones.

       

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