Reference Report for SoyBase72903259
| Title: | Photosynthetic responses of soybean to soybean aphid (Homoptera: Aphididae) injury |
| Authors: | Macedo, T.B., Bastos, C.S., Higley, L.G., Ostlie, K.R., Madhavan, S. |
| Source: | J. Econ. Entomol. 2003, 96(1):188-193 |
| Abstract: | The soybean aphid, Aphis glycines, was discovered in the United States in the summer of 2000. Since that initial discovery, the aphid has spread across northern soyabean production regions. In 2001, we examined the physiological responses of soyabeans to low aphid densities ( < 50 aphids per leaf). In this study, we determined photosynthetic rates, leaf fluorescence responses, and photosynthetic responses to variable carbon dioxide and light levels. In addition, analyses for chlorophyll content and stable carbon isotope ratios were used to differentiate potential differences in stomatal vs. mesophyll limitations to photosynthesis. We observed rate reductions of up to 50% on infested leaflets, including leaflets with no apparent symptoms of aphid injury (such as chlorosis). Differences in fluorescence data indicated that photoelectron transport was not impaired. These results indicate that substantial physiological impact on soyabean is possible even at low aphid densities. The conventional view of aphid injury acting through reductions in chlorophyll content and light-harvesting reactions of photosynthesis is not supported by our findings in this system. |
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