外源褪黑素对NaCl胁迫下草莓幼苗生理特性的缓解效应

Alleviating effect of exogenous melatonin on strawberry seedling under NaCl stress

    摘要
  • 摘要: 【目的】 研究NaCl胁迫下不同浓度褪黑素对草莓幼苗生长指标、光合色素含量、光合特性、叶绿素荧光特性和抗氧化酶活性的影响,为分析褪黑素缓解草莓NaCl胁迫的最适浓度提供理论依据。 【方法】 以甜查理为材料,测定幼苗在5 g/L NaCl处理下,外源施加不同浓度褪黑素(0、50、100、150和200 μmol/L),测定第3、6和9 d的生长指标、光合色素含量、光合特性、叶绿素荧光和抗氧化酶活性。 【结果】 NaCl胁迫下草莓幼苗的生长指标、光合色素含量、光合特性、叶绿素荧光特性和抗氧化酶活性显著降低。外源施加50、100、150和200 μmol/L浓度的褪黑素可不同程度的增加NaCl胁迫下草莓幼苗叶片生长指标、光合色素含量、光合特性、叶绿素荧光特性和抗氧化酶活性。褪黑素150 μmol/L的浓度效果为最佳,处理第9 d,与NaCl胁迫相比,草莓幼苗叶片的株高、茎粗、单株重、Chla、Chlb、Car、Pn、Ci、Fm、SOD、CAT、POD和APX分别增长了23.75%、37.97%、18.87%、37.95%、75.93%、41.22%、58.96%、26.47%、46.72%、32.89%、84.26%、48.34%和33.94%,F0的上升速度显著降低。 【结论】 在NaCl胁迫下,外源施加不同浓度的褪黑素均可有效缓解NaCl胁迫对草莓造成的伤害,其中150 μmol/L效果最佳。

     

    Abstract: 【Objective】 To study NaCl stress, different concentrations of exogenous melatonin on growth indicators, photosynthetic pigment content, photosynthetic characteristics, chlorophyll fluorescence characteristics and antioxidant activity of strawberry seedlings in the hope of providing the optimal concentration of stress of strawberry NaCl stress for melatonin theoretical basis. 【Methods】 Strawberry seedlings were taken as testing materials, and the seedlings were measured under 5 g/L NaCl treatment by spraying different concentrations of exogenous melatonin (0, 50, 100, 150 and 200 μmol/L).During the experiments, growth indicators, photosynthetic content, photosynthetic properties, chlorophyll fluorescence and antioxidant activity were determined the 3, 6 and 9 d. 【Results】 NaCl stress could reduce the growth index, photosynthetic properties, photosynthetic properties, chlorophyll fluorescence characteristics, and antioxidant activity of strawberry seedlings.Exogenous application of 50, 100, 150 and 200 μmol/L concentrations of melatonin increased them under NaCl stress.The concentration effect of melatonin 150 μmol/L was optimal, and after being processed 9 d, compared with NaCl stress,the plant height, stem diameter, fresh weight per plant, Chla, Chlb, Car, Pn, Ci, Fm, SOD, CAT, POD and APX of strawberry seedlings increased by 23.75%, 37.97%, 18.87%, 37.95%, 75.93%, 41.22%, 58.96%, 26.47%, 46.72%, 32.89%, 84.26%, 48.34%and 33.94%, F0 rising speed was significantly reduced. 【Conclusion】 Under NaCl stress, spraying different concentrations of melatonin can effectively alleviate NaCl stress injury to strawberries and the best effects is 150 μmol/L.

     

    • HTML全文
    • 参考文献(41)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回