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β-氨基丁酸对NaHCO3胁迫下杜鹃光合特性和抗氧化系统的影响

Effects of BABA on Photosynthetic Characteristics and Antioxidative System in Rhododendron under NaHCO3 Stress

    摘要
  • 摘要:
    目的 为了探讨β-氨基丁酸(BABA)能否诱导杜鹃抵御NaHCO3胁迫。
    方法 以杜鹃‘神州齐’2年生扦插苗为试材, 采用营养液沙培, 研究了不同浓度(0、50、100、200、400 μmol·L-1) BABA预处理对50 mmol·L-1的NaHCO3胁迫下杜鹃植株光合特性和抗氧化系统的影响。
    结果 结果表明:50 mmol·L-1的NaHCO3显著减小了杜鹃植株的生物量, 200 μmol·L-1的外源BABA能显著增加杜鹃植株的生物量; 外源BABA增加了NaHCO3胁迫下杜鹃叶片的叶绿素a(Chla), 叶绿素b(Chlb)和类胡萝卜素(Car)含量, 显著提高植株净光合速率(Pn), 减小气孔导度(Gs)和胞间CO2浓度(Ci), 提高超氧化歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、谷胱甘肽还原酶(GR)、抗坏血酸过氧化物酶(APX)和脱氢抗坏血酸还原酶(DHAR)等抗氧化酶活性, 降低NaHCO3胁迫诱导的活性氧积累和膜脂过氧化反应。
    结论 表明100200 μmol·L-1的外源BABA可以有效缓解NaHCO3胁迫对杜鹃植株的伤害。

     

    Abstract:
    Objective To investigate whether β-aminobutyric acid (BABA) could protect Rhododendron from NaHCO3 stress.
    Method 2-year-old Rhododendron 'shen zhou qi' cuttage seedlings were subjected to sandy culture in nutrient solution to study the effects of different concentrations of BABA (0, 50, 100, 200, and 400μmol·L-1) on photosynthetic characteristics and antioxidative system of Rhododendron leaves under 50 mmol·L-1 NaHCO3 stress.
    Result The biomass of Rhododendron significantly reduced under NaHCO3 stress. Exogenous BABA of 200μmol·L-1 significantly improved the biomass. Exogenous BABA increased chlorophyll a, chlorophyll b and carotenoid content in Rhododendron leaves under NaHCO3 stress, and significantly increased net photosynthetic rate, reduced stomatal conductance and intercellular CO2 concentration. Application of BABA could increase activities of some antioxidant enzymes including superoxide dismutase, peroxidase, catalase, glutathione reductase, ascorbate peroxidase and dehydroascorbate reductase under NaHCO3 stress, resulting in significant lower reactive oxygen species accumulation and membrane lipid peroxidation in alkali-treated Rhododendron leaves.
    Conclusion It is suggested that 100-200μmol·L-1 exogenous BABA can effectively alleviate the harm of Rhododendron under NaHCO3 stress.

     

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