| 模拟酸雨对龙眼叶片气体交换和叶绿素a荧光参数的影响（英文） |
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| 引用本文： | 邱栋梁,刘星辉,郭素枝.模拟酸雨对龙眼叶片气体交换和叶绿素a荧光参数的影响（英文）[J].植物生态学报,2002,26(4):441-0. |
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| 作者姓名： | 邱栋梁 刘星辉 郭素枝 |
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| 作者单位： | 福建农林大学园艺学院,福州,350002 |
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| 摘 要： | 研究了模拟酸雨对龙眼(Dimorcarpus longana)叶片气体交换和叶绿素a荧光参数的影响，结果表明：酸雨胁迫抑制龙眼光合作用，受胁迫叶片光补偿点上升。pH 3.0的酸雨处理6 h后叶片气体交换和叶绿素a荧光参数下降，停止处理后72 h可以恢复。pH 2.5的酸雨处理6 h后净光合速率（Pn）、气孔导度(Cs)、蒸腾速率（Tr），叶绿素a荧光参数Fv/Fo、Fv/Fm、PSII非环式电子传递的量子产量（ΦPSⅡ）、荧光下降比值（Rfd）、非光化学猝灭系数（qN）和光化学猝灭系数（qP）急剧下降，停
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| 关 键 词： | 模拟酸雨 龙眼 气体交换 Chl a荧光 光合作 |
| 修稿时间： | 2001年7月10日 |
EFFECTS OF SIMULATED ACID RAIN STRESS ON GAS EXCHANGE AND CHLOROPHYLL A FLUORESCENCE PARAMETERS IN LEAVES OF LONGAN |
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| QIU Dong_Liang,LIU Xing_Hui and GUO Su_Zhi.EFFECTS OF SIMULATED ACID RAIN STRESS ON GAS EXCHANGE AND CHLOROPHYLL A FLUORESCENCE PARAMETERS IN LEAVES OF LONGAN[J].Acta Phytoecologica Sinica,2002,26(4):441-0. |
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| Authors: | QIU Dong_Liang LIU Xing_Hui and GUO Su_Zhi |
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| Abstract: | Longan (Dimorcarpus longana Lour. cv. Wulongling) seedlings of two different ages grown in pots were selected to study the effects of acid rain stress on gas exchange, and chlorophyll a fluorescence parameters and their recovery. Sulfuric acid and nitric acid were selected for the preparation of artificial acid rain, based on the mole ratio 1:5 of sulfuric acid to nitric acid in the precipitation of southern Fujian. Dilution of reagent grade acid was done with distilled water and determined by Phsj-4 acidity analyzer. A series of solutions of simulated acid rains with pH 5.6, 3.0 and 2.5 were prepared. A sprayer was used to apply the acid solution to young trees. At each application, leaves were thoroughly wetted. Sprays were repeated 12 times in 6 h at 30 min intervals. Gas exchange was detected with an open gas analyzer CID-301PS, and chlorophyll a fluorescence parameters with OS5-FL modulated chlorophyll fluorometer.The results showed that photosynthesis was inhibited by acid rain stress, and light compensation point (LCP) of stressed leaves increased. Gas exchange and chlorophyll a fluorescence parameters of leaves were reduced after 6 h stress with acid rain of pH 3.0, and could be recovered to the level of control 72 h after the treatment ended. Net photosynthetic rate (Pn), stomatal conductance (Cs), transpiration rate (Tr), ratio of variable fluorescence to initial fluorescence (Fv/F0), ratio of variable fluorescence to maximum fluorescence (Fv/Fm), quantum yield of PSⅡelectron transport (ΦPSⅡ), ratio of fluorescence decrease (Rfd), nonphotochemical quenching (qN) and photochemical quenching (qP) were reduced after a 6 h stress with acid rain of pH 2.5, and could not be recovered 72 h after the stress ceased. Intercellular CO2 concentration (Ci) decreased under treatment with acid rain of pH 2.5, rose in the first day and surpassed the level of control 72 h after the acid rain spraying stopped. Dark respiration (Rd) was increased by acid rain, and could be recovered under treatment with pH 3.0, whereas no recovery was exhibited under treatment with pH 2.5.All the above suggest that under acid rain stress, Pn and Tr are reduced while LCP and Rd increase. The active center of PSⅡof Longan chloroplasts may be damaged by this treatment. The CO2 assimilation process in photosynthetic electron transport and the establishment of proton gradient was restricted, and the efficiency of both photosynthesis electron transport and energy transformation was reduced. The process of non-photochemical quenching was more sensitive to acid rain stress than the photochemical one. Fv/F0 and qN could be taken as physiological indices for detecting the damage caused by acid rain on Longan. |
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| Keywords: | Simulated acid rain Longan Gas exchange Chlorophyll a fluorescence Photosynthesis |
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