Elevated CO₂ alleviates damage from Potato virus Y infection in tobacco plants
2010
Ye, Lefu | Fu, Xue | Ge, Feng
The assessment of plant resistance to viral infection under elevated carbon dioxide [ECO₂] conditions is a key step in the development of plant-pathogen management. We quantified the aboveground biomass, foliar TNCs (total non-structural carbohydrates): Nitrogen ratio, and nicotine content of a tobacco cultivar (NC₈₉) in two CO₂ treatments after Potato virus Y N (PVYN) infection. Foliar peroxidase (POD) activity, total amino acid content, soluble protein content, and chlorophyll content were also tested to explore the potential interaction of ECO₂ and PVYN infection on tobacco secondary indices. ECO₂ increased plant aboveground biomass, did not significantly influence TNCs or nitrogen content; while PVYN infection had adverse effects on biomass, markedly affected the later two indices; but no interactive effects between ECO₂ and PVYN infection on these three indices were detected. As single factor, ECO₂ or PVYN infection reduced chlorophyll content, while ECO₂ increased the soluble protein content; interaction between two factors was observed on free amino acid and nicotine content. Variations in POD activity revealed that CO₂ influenced infected plant primary production by reducing virus resistance cost. Results suggested that plants grown under ECO₂ have alleviated damage of the virus infection or ECO₂ delay the viral spread to some extent.
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