| 酸雨胁迫下茅苍术的光合及生理响应 |
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| 引用本文： | 张文明,巢建国,谷巍,陆奇杰.酸雨胁迫下茅苍术的光合及生理响应[J].南方农业学报,2017,48(7):1167-1172. |
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| 作者姓名： | 张文明 巢建国 谷巍 陆奇杰 |
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| 作者单位： | 南京中医药大学 药学院,南京,210023 |
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| 基金项目： | 国家自然科学基金项目，国家中医药管理局基本药物所需中药材种子种苗繁育基地建设项目，江苏省中药优势学科 Ⅱ 期建设项目，江苏省"333 高层次人才培养工程"项目 |
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| 摘 要： | 目的]探讨酸雨胁迫对茅苍术光合及生理指标的影响,为茅苍术的抗酸雨栽培提供理论依据.方法]采用盆栽法对茅苍术进行不同梯度的模拟酸雨胁迫试验,测定其在酸雨胁迫下的光合及生理指标,并对各指标在不同胁迫程度下的变化趋势进行对比分析.结果]酸雨胁迫初期,茅苍术叶片的光合参数指标变化不一,净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)整体呈上升趋势,而胞间二氧化碳浓度(Ci)呈下降趋势,对酸雨胁迫表现出一定的适应性;胁迫后第21 d,pH 2.0和pH 3.0处理的Pn、Gs和Tr相对较高,Ci相对降低;至胁迫后第28 d,pH 2.0和pH 3.0处理的Pn、Gs和Tr急剧下降,Ci迅速上升;pH 4.0和pH 5.0处理的光合指标变化幅度相对缓慢.随着酸雨胁迫时间的延长,茅苍术叶片的3种抗氧化酶活性及丙二醛(MDA)和游离脯氨酸(Pro)含量总体上呈先升高后降低的变化趋势,其中超氧化物歧化酶(SOD)活性在胁迫后第15 d达最大值,过氧化物酶(POD)和过氧化氢酶(CAT)活性在胁迫后第22 d达最大值,且酸雨的酸性越强,各指标变化幅度越明显.结论]茅苍术叶片承受酸雨的阈值在pH 3.0左右,pH 3.0以下的酸雨会对茅苍术生长发育造成显著影响.
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| 关 键 词： | 茅苍术 酸雨胁迫 光合特性 生理指标 |
Photosynthesis and physiological responses of Atractylodes lancea(Thunb.) DC. under acid rain stress |
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| ZHANG Wen-ming,CHAO Jian-guo,GU Wei,LU Qi-jie.Photosynthesis and physiological responses of Atractylodes lancea(Thunb.) DC. under acid rain stress[J].Journal of Southern Agriculture,2017,48(7):1167-1172. |
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| Authors: | ZHANG Wen-ming CHAO Jian-guo GU Wei LU Qi-jie |
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| Abstract: | Objective]The influence of acid rain stress on photosynthesis and physiological indexes of Atractylodes lancea(Thunb.) DC. was investigated,so as to provide reference for anti-acid rain cultivation of A. lancea. Method]Pot experiments were conducted, and acid rain stresses of different gradients were simulated on A. lancea. Photosynthesis and physiological indexes of A. lancea under acid rain stress were measured, and variation trends of the indexes under stresses of different gradients were compared and analyzed. Result]Photosynthesis indexes of leaves of A. lancea varied at the ini-tial stage of acid rain stress. Net photosynthetic rate(Pn), stomatal conductance(Gs) and transpiration rate(Tr) presented an up-ward trend as a whole, while intercellular carbon dioxide concentration(Ci) presented a downward trend, showing a cer-tain adaptability to acid rain stress. After day 21 of stress, pH 2.0 and pH 3.0 treated Pn, Gs and Tr were high, and Ci de-creased. Pn,Gs and Tr treated by pH 2.0 and pH 3.0 decreased rapidly after day 28 of stress, and Ci increased rapidly. Varia-tion of photosynthesis index in pH 4.0 and pH 5.0 treatment was slow. With the extension of acid rain stress, the activities of three kinds of antioxidant enzymes, malondialdehyde(MDA) and free proline(Pro) in leaves of A. lancea were first increased and then decreased. Superoxide dismutase(SOD) activity on day 15 of stress reached the maximum value, and peroxidase(POD) and catalase(CAT) activity reached the maximum value on day 22. As acidity of acid rain increased, the variation range of indexes were more obvious. Conclusion]The threshold value of acid rain for A. lancea leaf is about pH 3.0,and the acid rain under pH 3.0 has significant effects on growth and development of A. lancea. |
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| Keywords: | Atractylodes lancea(Thunb ) DC acid rain stress photosynthesis characteristics physiological index |
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