Growth and aluminum absorption responses of Hydrangea macrophylla to combined treatments of acid rain and aluminum
In order to investigate the growth and aluminum (Al) absorption responses of Hydrangea macrophylla under combined stress of simulated acid rain and Al, we studied biomass accumulation, photosynthetic pigment contents, chlorophyll fluorescence characteristics, and Al accumulation and distribution of...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2020-12-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2020.03.131 |
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| Summary: | In order to investigate the growth and aluminum (Al) absorption responses of Hydrangea macrophylla under combined stress of simulated acid rain and Al, we studied biomass accumulation, photosynthetic pigment contents, chlorophyll fluorescence characteristics, and Al accumulation and distribution of ‘Mama Blue’ under different treatments [acid rain (pH 5.0 and 3.0), aluminum (Al<sup>3＋</sup> 1 and 2 g/kg) and their combinations] by pot experiments. The results showed that there were no significant effects on chlorophyll contents and photosystemⅡ (PSⅡ) reaction center under single acid rain treatment, and the biomass of root, stem, leaf and total biomass accumulation significantly increased under pH 5.0 treatment. Aluminum (2 g/kg) alone significantly decreased the total biomass, chlorophyll (a/b) value, photochemical quenching coefficient (q<sub>p</sub>) and electron transport rate (ETR), but the non-photochemical quenching coefficient (NPQ) was improved markedly. The low pH and high concentration of Al destroyed the PSⅡ reaction center, reduced the photosynthetic pigment contents, affected its composition, and inhibited the growth of the plant. In addition, acid rain, Al stress and the compound treatment significantly increased the accumulation of leaves and total Al in the plants. Compared with Al stress alone, the total aluminum content under the compound pollution was higher at the same Al concentration. The accumulation of aluminum in different parts of the plant was as follows: root＞stem＞leaf. The interaction of acid rain and aluminum had significant impacts on NPQ, leaf and total biomass, and aluminum contents in various parts of the plant. In conclusion, H. macrophylla has strong acid resistance, and aluminum pollution affects them more than acid rain stress; acid rain promotes the absorption of aluminum, and the compound pollution of high aluminum and strong acid is disadvantageous to the growth of H. macrophylla. |
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| ISSN: | 1008-9209 2097-5155 |