Ozone-Induced Changes in Antioxidant Systems of Ginkgo Biloba in Relation to the Developmental Stage of the Leaves

Kun Yan, Xingyuan He, Wei Chen, Tao Lu
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Abstract

Ozone (O3) pollution has adverse effects on the trees grown in urban area. Using open top chambers, responses of antioxidant systems were detected in Ginkgo biloba leaves at different developmental stages after a long term O3 exposure (O3 concentration ≈ 80 nmol mol-1). As leaf size is closely related to the developmental stage, leaves with different sizes were chosen to indicate the various developmental stages. The results suggested that activities of superoxide dismutase (SOD), ascorbate peroxidase (APX) and catalase (CAT) were induced to a higher level in younger leaves with 50% expansion size under elevated O3 exposure, whereas O3-induced decrease in APX and SOD activities was found in the 80% and 100% expanded ones. Dehydroascorbate reductase (DHAR) activity and ascorbate (Asc) content were not affected by high O3 in 50% expanded leaves, but the O3-induced decrease in them occurred in the 80% and 100% expanded ones. Malondialdehyde (MDA) and hydrogen peroxide (H2O2) contents increased significantly in the 80% and 100% expanded leaves at elevated O3. However, O3-induced increase in MDA and H2O2 contents did not reach the significant level in the 50% expanded leaves, indicating the higher resistance to O3 in the younger leaves. The positive responses of antioxidant systems could be responsible for the higher resistance to O3 in the younger leaves.
臭氧诱导银杏叶片抗氧化系统与发育阶段的关系
臭氧(O3)污染对城市树木生长有不利影响。采用开顶实验室,研究了长期暴露于O3 (O3浓度≈80 nmol mol-1)下不同发育阶段银杏叶片抗氧化系统的反应。由于叶片大小与发育阶段密切相关,因此选择不同大小的叶片来表示不同的发育阶段。结果表明,在O3浓度升高的情况下,膨大50%的幼叶中超氧化物歧化酶(SOD)、抗坏血酸过氧化物酶(APX)和过氧化氢酶(CAT)活性升高,而膨大80%和100%的幼叶中APX和SOD活性降低。50%展开叶中脱氢抗坏血酸还原酶(DHAR)活性和抗坏血酸(Asc)含量不受高氧的影响,而80%和100%展开叶中脱氢抗坏血酸还原酶(DHAR)活性和抗坏血酸(Asc)含量受到高氧的影响。高浓度O3处理下,80%和100%膨大叶片丙二醛(MDA)和过氧化氢(H2O2)含量显著增加。而O3诱导的MDA和H2O2含量的增加在50%膨大叶片中未达到显著水平,说明幼龄叶片对O3的抗性较高。抗氧化系统的积极响应可能是幼龄叶片对O3抗性较高的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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