镉、铅胁迫对滇杨(Populus yunnanensis)幼苗生长及其光合生理的影响

doi:10.19741/j.issn.1673-4831.2020.0864

摘要/Abstract

摘要： 为探究滇杨（Populus yunnanensis）在Cd、Pb胁迫下的生长及其光合生理反应，采用水培的方式对滇杨幼苗开展胁迫试验。结果表明，在Cd胁迫下，滇杨株高无显著变化，总根长显著降低，地径在Cd浓度为100 μmol·L^-1时显著增加；在Pb胁迫下，滇杨株高、总根长均显著降低，地径则在Pb浓度为50和100 μmol·L^-1时显著增加。Cd、Pb胁迫下丙二醛含量随着胁迫浓度增加而上升，总酚含量仅在胁迫浓度为100和200 μmol·L^-1时显著提高。200 μmol·L^-1 Cd处理、100和200 μmol·L^-1 Pb处理的叶绿素含量显著低于对照。PS Ⅱ最大光化学效率和PS Ⅱ潜在活性仅在Cd浓度为100 μmol·L^-1时显著低于对照。在Cd胁迫下，滇杨的净光合速率随着胁迫浓度的增加而降低，而在Pb胁迫下，净光合速率则随着胁迫浓度的增加先升后降。滇杨在Cd浓度为50 μmol·L^-1时耐受性最强，在Pb浓度为100 μmol·L^-1时耐受性最强，滇杨对Cd的耐受性强于Pb。

关键词: 滇杨, Cd胁迫, Pb胁迫, 光合生理

Abstract: In order to explore the growth and photosynthetic physiological responses of Populus yunnanensis under cadmium and lead stress, hydroponics was used to carry out stress experiment on P. yunnanensis seedlings. The results show that under cadmium stress, the plant height of P.yunnanensis had no significant change, while the total root length decreased significantly, and the ground diameter increased significantly at the cadmium concentration of 100 μmol·L^-1. Under Pb stress, the plant height and total root length of P.yunnanensis decreased significantly, while the ground diameter increased significantly at Pb concentrations of 50 and 100 μmol·L^-1. Under Cd and Pb stress, MDA content increased with the increase of stress concentration, and total phenol content increased significantly only at the stress concentration of 100 and 200 μmol·L^-1. The chlorophyll content of 200 μmol·L^-1 Cd treatment, 100 μmol·L^-1 Pb treatment was significantly lower than that of 0 μmol·L^-1 Pb and Cd treatment (control). The maximum photochemical efficiency and potential activity of PS Ⅱ were significantly lower than those of control at 100 μmol·L^-1cadmium concentration. Under cadmium stress, the net photosynthetic rate of P.yunnanensis decreased with the increase of stress concentration, while under lead stress, the net photosynthetic rate first increased and then decreased with the increase of stress concentration. The tolerance of P. yunnanensis to Cd was the strongest when the concentration was 50 μmol·L^-1, and it was the strongest when the concentration was 100 μmol·L^-1 under Pb stress, and the tolerance to Cd was stronger than that to Pb.

Key words: Populus yunnanensis, cadmium stress, lead stress, photosynthetic physiology

中图分类号:

S792

郑武扬, 王艳霞, 郑雁方, 李净峰. 镉、铅胁迫对滇杨(Populus yunnanensis)幼苗生长及其光合生理的影响[J]. 生态与农村环境学报, 2021, 37(10): 1331-1340.

ZHENG Wu-yang, WANG Yan-xia, ZHENG Yan-fang, LI Jing-feng. Effects of Cadmium and Lead Stress on Growth and Photosynthetic Physiology of Populus yunnanensis Seedlings[J]. Journal of Ecology and Rural Environment, 2021, 37(10): 1331-1340.

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