不同浓度O3对黄檗幼苗叶片生理特征的影响

生态学杂志

不同浓度O₃对黄檗幼苗叶片生理特征的影响

付伟^1,2，邓莉兰¹，徐胜^2**，何兴元²,陈玮²,李梅^2,3,赵诣²,苏丽丽²

(¹西南林业大学园林学院，昆明 650224； ²森林与土壤生态国家重点实验室，中国科学院沈阳应用生态研究所，沈阳 110016； ^3辽宁师范大学生命与科学学院，辽宁大连 116033)

出版日期:2014-09-10 发布日期:2014-09-10

Effects of different O₃ concentrations on leaf physiology of Phellodendron amurense Rupr. seedlings.

FU Wei^1,2, DENG Li-lan¹, XU Sheng^2**, HE Xing-yuan², CHEN Wei², LI Mei^2,3, ZHAO Yi²， SU Li-li²

(¹Faculty of Landscape Architecture, Southwest Forestry University, Kunming 650224, China; ²State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ³Faculty of Life Science, Liaoning Normal University, Dalian 116033, Liaoning, China)

Online:2014-09-10 Published:2014-09-10

摘要/Abstract

摘要：

以4年生黄檗(Phellodendron amurense Rupr.)幼苗为实验材料，利用开顶箱模拟法，开展了4个不同浓度O₃ 40 (对照)、80、120和200 nmol·mol^-1的气体熏蒸实验，测定并分析了黄檗叶片光合色素含量、净光合速率、膜脂质过氧化产物和抗氧化酶活性等生理指标的变化规律。结果表明：与CK相比，随着O₃浓度增加和处理时间延长，黄檗幼苗叶片叶绿素总含量、类胡萝卜素含量和净光合速率显著下降(P<0.05)，最大降幅分别为52.76%、44.57%和54.67%；叶片离子渗漏率、丙二醛含量显著增加(P<0.05)，最大增幅分别为101.49%和70.21%。当O₃浓度为80 nmol·mol^-1时，叶片最大光化学效率(F_v/F_m)无显著变化，而O₃浓度为120和200 nmol·mol^-1时，F_v/F_m显著下降(P<0.05)，表明黄檗幼苗的光合系统功能在超高浓度臭氧下受到了显著伤害。叶片抗氧化超氧化物歧化酶活性在开始处理后的前14 d升高，随后下降，最大降幅为17.22%。O₃浓度为120和200 nmol·mol^-1时，超氧阴离子(O₂^-_·)含量显著升高(P<0.05)；O₃浓度为80 nmol·mol^-1时，O₂^-_·含量在处理7 d与CK相比显著增加，随后无显著差异。表明黄檗幼苗在生长初期对中等高浓度(80 nmol·mol^-1)臭氧熏蒸具有一定的适应和耐受性是因其具有较强抗氧化保护能力，更高浓度的O₃或更长时间的熏蒸对叶片光合系统产生破坏。

关键词: 绿色发展, 江西省, 区划, 指标体系

Abstract: Fouryearold Phellodendron amurense Rupr. seedlings were exposed to four levels (40 (CK), 80, 120, and 200 nmol·mol^-1) of O₃ in opentop champers (OTCs). The changes in photosynthetic pigment contents, net photosynthesis rate, lipid peroxidation and the activity of antioxidative enzymes were periodically measured in leaves of P. amurense. The results showed that with the increasing O₃ concentration and exposure time, total chlorophyll (Chl) contents, carotenoid (Car) contents and net photosynthesis rate (P_n) were significantly decreased by 52.76%, 44.57% and 54.67%, respectively (P<0.05); electrolyte leakage and malondialdehyde (MDA) contents were significantly increased by 101.49% and 70.21%, respectively (P<0.05). When the O₃ concentration was 80 nmol·mol^-1, the maximum photochemical efficiency (F_v/F_m) had no significant change, while a significant decrease in F_v/F_m was observed when the O₃ concentration was increased to 120 or 200 nmol·mol^-1, showing a significant harm of photosynthetic system function by high O₃ concentrations. Superoxide dismutase (SOD) activity increased at the first fourteen days exposure and then decreased by 17.22%. Compared with CK, the superoxideanion (O₂^-_·) content increased significantly (P<0.05) when the O₃ concentration was 120 or 200 nmol·mol^-1, while only increased significantly in the seventh day when the O₃ concentration was 80 nmol·mol^-1. It is concluded that P. amurense can tolerate moderately high concentrations of O₃ for a period which is related to its antioxidative ability. Higher O₃ concentrations or longer exposure would incur harm to the photosynthetic system of the leaves.

Key words: index system, green development, Jiangxi Province, regionalization

付伟1,2，邓莉兰1，徐胜2**，何兴元2,陈玮2,李梅2,3,赵诣2,苏丽丽2. 不同浓度O₃对黄檗幼苗叶片生理特征的影响[J]. 生态学杂志.

FU Wei1,2, DENG Li-lan1, XU Sheng2**, HE Xing-yuan2, CHEN Wei2, LI Mei2,3, ZHAO Yi2， SU Li-li2. Effects of different O₃ concentrations on leaf physiology of Phellodendron amurense Rupr. seedlings.[J]. cje.

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不同浓度O₃对黄檗幼苗叶片生理特征的影响

Effects of different O₃ concentrations on leaf physiology of Phellodendron amurense Rupr. seedlings.

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