Photosynthetica 2008, 46(3):457-462 | DOI: 10.1007/s11099-008-0078-9
Photosynthesis, chlorophyll fluorescence, and antioxidant enzyme responses of invasive weed Mikania micrantha to Bemisia tabaci infestation
- 1 Institute of Ecology, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China
- 2 Graduate University of Chinese Academy of Sciences, Beijing, PR China
In a glasshouse, Bemisia tabaci infestation largely reduced response of photosynthesis to irradiance and CO2 concentration of Mikania micrantha compared with the non-infested control (C) ones. The maximum irradiance-saturated photosynthetic rate (P max) and saturation irradiance (SI) of the infested M. micrantha were only 21.3 % and 6.5 % of the C-plants, respectively. B. tabaci infestation led to the reduction of contents of chlorophyll and carotenoids in M. micrantha, which was accompanied with the decrease of actual photosystem 2 (PS2) efficiency (ΦPS2), efficiency of excitation energy capture by open PS2 reaction centres (Fv'/Fm'), electron transport rate (ETR), and photochemical quenching (qP). Moreover, superoxide dismutase and catalase activities significantly decreased while proline and glutathione contents significantly increased in infested M. micrantha. Hence B. tabaci infestation not only induced direct damage of photosynthetic apparatus but also altered the antioxidant enzymes activities in M. micrantha, which might as consequences accelerate senescence of this weed.
Additional key words: carotenoids; catalase; chlorophyll fluorescence; electron transport rate; glutathione; photochemical quenching; photosystem 2 efficiency; proline; superoxide dismutase
Received: March 7, 2008; Accepted: May 19, 2008; Published: September 1, 2008 Show citation
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