Abstract
Photosynthetic parameters were measured in two invasive weeds, Mikania micrantha and Chromolaena odorata, grown in soil under full, medium, and low irradiance and full, medium, and low water supply. Both species showed significantly higher net photosynthetic rate, quantum yield of PS 2 photochemistry and photochemical quenching coefficient under high than low irradiance. For M. micrantha, low irradiance caused decreased chlorophyll content (Chl), Chl a/b ratio and maximum photochemical efficiency of PS 2 (Fv/Fm), while drought decreased Chl content and Fv/Fm and increased nonphotochemical quenching (NPQ). However, these parameters were much less affected in C. odorata except that Chl content and NPQ slightly increased under drought and high irradiance. High irradiance increased xanthophyll pools in both species, especially M. micrantha under combination with drought.
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Abbreviations
- A:
-
antheraxanthin
- FC:
-
field water capacity
- FI:
-
full irradiance
- Fv/Fm :
-
maximum photochemical efficiency of PS 2
- FW:
-
full water
- LI:
-
low irradiance
- LW:
-
low water
- MI:
-
medium irradiance
- MW:
-
medium water
- NPQ:
-
nonphotochemical quenching coefficient
- PN :
-
net photosynthetic rate
- qP:
-
photochemical quenching coefficient
- V:
-
violaxanthin
- Z:
-
zeaxanthin
- ΦPS2 :
-
quantum yield of PS 2 photochemistry
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Acknowledgements: We thank Prof. Zhi-Fang Lin, Prof. Han-Hui Kuang, and two anonymous reviewers for critical comments on earlier version of this manuscript. The study was funded by National Natural Science Foundation of China (No. 30630015) and the Pear River Delta Urban Forest and the Environment Research Program of SCBG (200603).
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Zhang, L.L., Wen, D.Z. & Fu, S.L. Responses of photosynthetic parameters of Mikania micrantha and Chromolaena odorata to contrasting irradiance and soil moisture. Biol Plant 53, 517–522 (2009). https://doi.org/10.1007/s10535-009-0093-0
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DOI: https://doi.org/10.1007/s10535-009-0093-0