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引用本文:李强,王国祥,马婷,王文林,潘国权.水网藻附着对亚洲苦草光合特性的影响.湖泊科学,2007,19(3):315-320. DOI:10.18307/2007.0313
LI Qaing,WANG Guoxiang,MA Ting,WANG Wenli,PAN Guoquan.Changes of photosynthetic characters of Vallisneria asiatica adhered by Hydrodictyon reticulatum. J. Lake Sci.2007,19(3):315-320. DOI:10.18307/2007.0313
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水网藻附着对亚洲苦草光合特性的影响
李强, 王国祥, 马婷, 王文林, 潘国权
南京师范大学地理科学学院江苏省环境演变及生态建设重点实验室, 南京 210097
摘要:
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(Vallisneria asiatica)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。
关键词:  水网藻  苦草  光系统Ⅱ  叶绿素荧光特性
DOI:10.18307/2007.0313
分类号:
基金项目:国家863"十五"重大科技专项(2003AA601100-2);国家"十五""211工程"重大项目"不同时空尺度环境演变和生态建设"联合资助
Changes of photosynthetic characters of Vallisneria asiatica adhered by Hydrodictyon reticulatum
LI Qaing, WANG Guoxiang, MA Ting, WANG Wenli, PAN Guoquan
Jiangsu Key Laboratory of Environmental Change and Ecological Construction, College of Geographical Science, Nanjing Normal University, Nanjing 210097, P. R. China
Abstract:
Chlorophyll fluorescence characters and rapid light curves (RLCs) of of Vallisneria asiatica adhered by Hydrodictyon reticulatum were measured by a submersible, pulse-amplitude modulated fluorometer:Diving-PAM.Results indicated that on the top of the leaves, FP/Fm decreased apparently after 15 days, and Photosystem photochemical efficiency was reduced remarkably.Dissipated heat of the leaves adhered by H.reticulatum increased in high significant level (P<0.01) after 15 days.The efficient quantum yield, photochemical quenching, relative Electron-transport rate (rETR), chlorophyll a (abbreviation, Chi.a), carotenoid (abbreviation, Car), the ratio of Chi.a and Chi.b, the ratio of Car and Chi.a of these leaves decreased significantly.It was observed from RLCs that when photosynthetically active radiation excess 104μmol/(m2·s), rETR of V.asiatica leaves with H.reticulatum in irradiance were less notablely than that of the control, and photosynthetic ability of these leaves decreased.Meanwhile, the saturating irradiance (248μmol/(m2·s)) of leaves in the experimental pool was significantly less than 685 μmol/(m2·s) of the control.This indicated that after H.reticulatum adhered to V.asiatica, light responding capacity of V.asiaticas leaves decreased notablely in 15 days.
Key words:  Hydrodictyon reticulatum  Vallisneria asiatica  Photosystem Ⅱ  photosynthetic characters
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