biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 53:517-522, 2009 | DOI: 10.1007/s10535-009-0093-0

Responses of photosynthetic parameters of Mikania micrantha and Chromolaena odorata to contrasting irradiance and soil moisture

L. L. Zhang1, D. Z. Wen1,*, S. L. Fu1
1 Institute of Ecology, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, P.R. China

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.

Keywords: chlorophyll fluorescence; invasive weeds; net photosynthetic rate; photosystem 2; xanthophyll cycle
Subjects: carotenoids; chlorophyll a,b; chlorophyll fluorescence; Chromolaena odorata; diurnal courses; Mikania micrantha; photon flux density; photosynthetic rate; water stress; xanthophylls

Received: November 12, 2008; Accepted: July 27, 2009; Published: September 1, 2009  Show citation

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Zhang, L.L., Wen, D.Z., & Fu, S.L. (2009). Responses of photosynthetic parameters of Mikania micrantha and Chromolaena odorata to contrasting irradiance and soil moisture. Biologia plantarum, 53(3), 517-522. doi: 10.1007/s10535-009-0093-0
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