Study finds that increased ozone concentration leads to decreased resistance of resistant varieties

Insect-transmitted plant viruses often cause huge economic losses to crops. Therefore, breeding crop varieties with virus resistance is one of the important methods for preventing and controlling virus hazards. At present, with the acceleration of the modernization process, the concentration of near-surface ozone (O3) continues to increase. But how this change affects crop resistant varieties is still unclear.

The Research Group of Population Ecology and Global Change of the Institute of Zoology, Chinese Academy of Sciences has simulated the effect of plants on aphid-borne virus under the scenario that the near-surface ozone (O3) concentration increases from the current 40 ppb concentration to the future 80 ppb. The researchers took tobacco varieties resistant to potato Y virus (PVY) and conventional tobacco varieties sensitive to potato Y virus (PVY) as the research objects, and systematically determined the above-ground organisms of the two planted plants under high concentration ozone (O3) in the future Amount, chlorophyll, nitrogen content, non-structural sugar, soluble protein, total amino acids, nicotine and peroxidase activity, etc. The hazards of high-concentration ozone (O3) and virus (PVY) in these two tobacco varieties were analyzed respectively And synergistic response mechanisms.

The results found that: under the current ozone concentration (40ppb), tobacco resistant varieties will accumulate more biomass after being infected by the virus (PVY), and the carbon-to-nitrogen ratio decreases; but in an environment with increased ozone (80ppb) Under these conditions, resistant varieties have lost their biomass advantage while maintaining a low carbon to nitrogen ratio. Furthermore, by comparing changes in peroxidase activity in leaves, it was found that the cost of tobacco resistance is closely related to biomass accumulation and carbon-to-nitrogen ratio; when subjected to stress factors such as high concentration ozone or plant virus (PVY) hazards, tobacco resistance The chlorophyll content in the product plant was stable, but the chlorophyll content of the non-resistant variety tobacco decreased significantly.

The study shows that anti-viral tobacco varieties are more sensitive to high concentrations of ozone than ordinary varieties; an increase in ozone concentration leads to a decrease in tobacco resistance to aphid-borne viruses.

The above study was published in the Journal of Experimental Botany (Ye L., Fu X. & Ge F. 2011. Enhanced sensitivity to higher ozone in a pathogen-resistant tobacco cultivar. DOI: 10.1093 / jxb / err361). The first authors of this article (co-author) Ye Lefu and Fu Xue are graduated doctoral students of the Population Ecology and Global Change Research Group, and the corresponding author is Ge Feng.

The research work was supported by the National Fundamental Basic Research Program (973) and the National Natural Science Foundation of China.

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