• ISSN 1008-505X
  • CN 11-3996/S

等渗Ca(NO3)2和NaCl胁迫对番茄光合作用的影响

Effects of iso-osmotic Ca(NO3)2 and NaCl treatment on photosynthesis in leaves of tomato

    摘要
  • 摘要: 研究了番茄的光合作用对等渗Ca(NO3)2和NaCl处理的响应。在等渗条件下120mmol.LNaCl和80mmol.LCa(NO3)2胁迫后,番茄叶片的叶绿素a、叶绿素b、总叶绿素含量、Chl.a/Chl.b比值、净光合速率(Pn)、气孔导度(Gs)、原初光能转换效率(Fv.Fm)、光合电子传递量子效率(ΦPSII)、Fv.Fo、光化学猝灭系数(qP)均呈下降趋势,以NaCl处理的下降幅度大于Ca(NO3)2处理;而Ca(NO3)2处理的胞间CO2浓度(Ci)呈下降趋势,NaCl处理的Ci呈升高趋势。因此,两种盐处理均对番茄植株光合作用造成了伤害,NaCl造成的伤害较Ca(NO3)2较为严重,Ca(NO3)2胁迫净光合速率下降可能是气孔限制所引起的,而NaCl胁迫净光合速率下降可能是由非气孔因子限制引起的。

     

    Abstract: The effects of iso-osmotic Ca(NO3)2 and NaCl treatment on photosynthesis in leaves of tomato were studied. The results indicated chlorophyll content, net photosynthetic rate(Pn), stomatal conductance(Gs), intrnsic photochemical efficiency(Fv/Fm),quantum yield of PSII (ΦPSII), Fv/Fo and photochemical quenching(qP) were decreased by salt stress. However, the decreased degree of NaCl treatment was bigger than that of Ca(NO3)2 treatment. Intercellular CO2 concentration(Ci) was decreased by Ca(NO3)2 treatment, while was increased by NaCl treatment.So both of treatments caused stress to tomato plant, and NaCl stress was heavier than Ca(NO3)2 stress. We could conclude that stomatal limitation was a dominating factor of Pn decrease under Ca(NO3)2stress and non-stomatal limitation was a dominating factor of Pn reduction under NaCl stress.

     

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