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湖泊科学  2007 

水网藻附着对亚洲苦草光合特性的影响

DOI: 10.18307/2007.0313

Keywords: 水网藻,苦草,光系统Ⅱ,叶绿素荧光特性

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Abstract:

运用水下饱和脉冲荧光仪(Diving-PAM)测定附着了水网藻的亚洲苦草(Vallisneriaasiatica)叶片的荧光参数和快速光响应曲线。在水网藻主要附着的苦草叶片上部,15d后FP/Fm显著下降,光系统(PS)的光化学效率显著降低;附着水网藻的叶片通过热的形式耗散掉的能量极显著增加(P<0.01),有效荧光产量、光化学淬灭系数和相对光合电子传递速率(rETR)、Chl.a、类胡萝卜素(Car)、Chl.a/Chl.b和Car/Chl.a均显著降低;在快速光响应曲线中,当光照强度高于104μmol/(m2·s)后,随光照强度的增加,附着水网藻的苦草叶片的rETR显著低于对照,光合作用能力下降;且其饱和光强为248μmol/(m2·s),显著低于对照叶片的685μmol/(m2·s),表明水网藻附着苦草叶片后导致叶片光响应能力显著下降。

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