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To make plants more attractive to vectors of viruses, plant-infecting viruses can alter host plant physiology. The recent outbreaks of  Tomato yellow leaf curl virus  (TYLCV) relate to the spread of its primary vector, the whitefly  Bemisia tabaci . Here, we investigated the question of whether the better performance of  B. tabaci  Q, relative to that of the B biotype, on TYLCV-infected tomato plants could be explained by differences in the ability of the  B. tabaci  Q and B to obtain free amino acids from the virus-infected plants. We found that the TYLCV infection of tomato plants significantly affected the mole percentage (mol%) of free amino acids in the phloem sap of the tomato plants and the mol% of free amino acids in  B. tabaci  adults and  B. tabaci  honeydew. The TYLCV infection caused the mol% of a larger number of free amino acids to rise in  B. tabaci  Q than in B, and the analysis of honeydew indicated that, when feeding on TYLCV-infected plants,  B. tabaci  Q was better able to use the free amino acids than  B. tabaci  B. The results suggest that  B. tabaci  Q is better adapted than B to feed on TYLCV-infected plants, and that TYLCV alters the  B. tabaci  B–Q competitive interaction in favor of Q.

Amino Acid Utilization May Explain Why Bemisia tabaci Q and B Differ in Their Performance on Plants Infected by the Tomato yellow leaf curl virus