| 不同浓度酸雨对镉污染下桑树幼苗生物量和生理特性的影响 |
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| 引用本文： | 徐晨阳,毛晓瑜.不同浓度酸雨对镉污染下桑树幼苗生物量和生理特性的影响[J].浙江农业学报,2018,30(12):2112. |
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| 作者姓名： | 徐晨阳 毛晓瑜 |
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| 作者单位： | 浙江农林大学 林业与生物技术学院,浙江 杭州 311300 |
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| 基金项目： | 浙江省自然科学基金 (LQ17C160004);浙江省公益技术应用研究计划(分析测试) (2016C37065) |
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| 摘 要： | 研究不同浓度酸雨(AR5.6、AR3.0)对重金属镉(Cd)污染下农桑12号幼苗生物量和生理特性的影响,为重金属污染严重及酸雨频发地区桑树选种育种提供理论依据。以农桑12号幼苗作为材料,采用盆栽试验,研究Cd污染(100 mg·kg-1)条件下农桑12号幼苗生物量积累、气体交换速率、叶绿素荧光参数的响应特征,以及加入弱酸性及重度模拟酸雨溶液对受Cd胁迫的农桑12号幼苗的生理效应。结果表明:1) Cd胁迫下,农桑12号幼苗的总干物质积累(DMA)、净光合速率(Pn)、蒸腾速率(E)、胞间二氧化碳浓度(Ci)、气孔导度(Gs)、PSⅡ最大光化学量子产量(Fv/Fm)、PSⅡ潜在活性(Fv/F0)、电子传递速率(ETR)均不同程度降低,非光化学淬灭系数(qN)有所上升。2) 2种不同浓度的模拟酸雨溶液处理下,农桑12号幼苗的Pn、E、Ci均显著降低,AR3.0处理的下降幅度更大;AR5.6处理下Fv/Fm、Fv/F0、PSⅡ光合量子产量Y(Ⅱ)、ETR有所上升,但AR3.0处理下Fv/Fm、Fv/F0均显著下降。3)复合处理下,与单独Cd处理相比,AR5.6的加入,增大了农桑12号幼苗茎和叶的比例,Pn、E、Ci、Gs、Fv/Fm、Fv/F0、Y(Ⅱ)、ETR均有所缓解;而AR3.0的加入,进一步降低了以上指标。以上结果表明,Cd胁迫对农桑12号幼苗的DMA存在明显的抑制作用,主要体现在根生物量(RW)的降低;还对气体交换速率有明显的负面影响,使植株光合机构受损严重。不同浓度模拟酸雨处理对农桑12号植株生物量积累、气体交换速率和光合机构均有不同程度的影响,AR3.0处理的负面作用显著高于AR5.6处理。Cd处理前提下,AR5.6的加入有利于植株光合机构的恢复,但AR3.0的加入加剧了植株的受胁迫程度。
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| 关 键 词： | 重金属 酸沉降 生物量分配 光合作用 叶绿素荧光 土壤修复 |
| 收稿时间： | 2018-04-23 |
Effects of different concentrations of acid rain on biomass allocation and physiological characteristics in Morus alba seedlings under cadmium pollution |
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| XU Chenyang,MAO Xiaoyu.Effects of different concentrations of acid rain on biomass allocation and physiological characteristics in Morus alba seedlings under cadmium pollution[J].Acta Agriculturae Zhejiangensis,2018,30(12):2112. |
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| Authors: | XU Chenyang MAO Xiaoyu |
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| Institution: | School of Forestry and Biotechnology, Zhejiang A&F University, Lin'an 311300, China |
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| Abstract: | To explore the effects of different concentrations of acid rain (AR5.6, AR3.0) on the biomass allocation and physiological character of Nongsang12 seedlings under heavy metal Cd and provide a theoretical basis for breeding of Morus alba in areas with severe heavy metal pollution and frequent acid rain, we measured biomass accumulation, photosynthetic capacity and chlorophyll fluorescence of Nongsang12 seedlings under Cd stress (100 mg·kg-1), and the physiological effect by faintly acid and severe acid rain solution of Nongsang12 seedlings under Cd stress. The results showed as follows: 1) When compared to the controls, decreases in dry matter accumulation (DMA), net photosynthetic rate (Pn), transpiration rate (E), intercellular CO2 concentration (Ci), stomatal conductance (Gs), the maximum photochemical efficiency of PSⅡ (Fv/Fm), potential activity of PSⅡ (Fv/F0), electron transport rate (ETR) to different degree and increase in non-photochemical quenching (qN) in Nongsang12 seedlings under Cd stress were found. 2) Further decreases in Pn, E, Ci were found in Nongsang12 seedlings under treatment of AR3.0 which were greater than those of AR5.6; Increases of Fv/Fm, Fv/F0, effective quantum yield of PSⅡ Y(Ⅱ), ETR under treatment of AR5.6 and decreases of Fv/Fm, Fv/F0 were found. 3) Compared to the treatment of Cd, increases of proportions in stem and leaf and decreases of Pn, E, Ci, Gs, Fv/Fm, Fv/F0, Y(Ⅱ), ETR in Nongsang12 seedlings were remitted by AR5.6 but intensified by AR3.0. Finally, we got the following conclusion: There was a negative effect exerted by Cd stress on DMA and it was behaved in the decrease of root weight (RW), besides, there was also negative effect of gas exchange rate and impairment of photosynthetic apparatus in Nongsang12 seedlings; Different concentrations of acid rain leaded to varying degrees damage of biomass allocation, gas exchange rate and impairment of photosynthetic apparatus in plants, and the negative influences under treatment of AR3.0 were greater than those of AR5.6; Under Cd stress, the combination with AR5.6 could result in a positive influence to the recovery of impairment of photosynthetic apparatus, but the combination with AR3.0 could intensify the degree of stress. |
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| Keywords: | heavy metal acid deposition biomass allocation photosynthesis chlorophy Ⅱ fluorescence soil remediation |
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