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Companion cropping with potato onions ( Allium cepa  var.  agrogatum Don. ) can enhance the disease resistance of tomato plants ( Solanum lycopersicum ) to  Verticillium dahliae  infection by increasing the expressions of genes related to disease resistance. However, it is not clear how tomato plants physiologically respond to  V. dahliae  infection and what roles sulfur plays in the disease-resistance. Pot experiments were performed to examine changes in the physiology and sulfur metabolism of tomato roots infected by  V. dahliae  under the companion cropping (tomato/potato onion). The results showed that the companion cropping increased the content of total phenol, lignin and glutathione and increased the activities of peroxidase, polyphenol oxidase and phenylalanine ammonia lyase in the roots of tomato plants. RNA-seq analysis showed that the expressions of genes involved in sulfur uptake and assimilation, and the formation of sulfur-containing defense compounds (SDCs) were up-regulated in the  V. dahlia- infected tomatoes in the companion cropping. In addition, the interactions among tomato, potato onion and  V. dahliae  induced the expression of the high- affinity sulfate transporter gene in the tomato roots. These results suggest that sulfur may play important roles in tomato disease resistance against  V. dahliae.

Physiological response and sulfur metabolism of the V. dahliae-infected tomato plants in tomato/potato onion companion cropping