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Phytopathogens and pests are two major factors that limit the growth of plants. The expression of a flavonoid regulator gene,  AtMYB12 ( AT2G47460 ), has been reported to increase the endogenous flavonoid content of tobacco and tomato. Previous research has only focused on the regulation mechanism of  v-myb avian myeloblastosis viral oncogene homolog  ( MYB ) transcription factors under single stress conditions. Here, research showed that  AtMYB12  was involved in regulating the resistance of tobacco to multiple biological stresses such as phytopathogens and aphid. We reported that transgenic tobacco carrying  AtMYB12  was more resistant to  Ralstonia solanacearum  when the up-regulated expression of several defense-related markers, such as  NbPR1a, NbNOA1 , and  NbrbohB , was activated, suggesting that the priming defense of a plant may contribute to bacterial disease resistance. The improvement of the resistance of  AtMYB12-expressing  transgenic tobacco is achieved by promoting the production of ROS, H 2 O 2 , and NO.  AtMYB12-expressing  transgenic tobacco also has resistance to fungal pathogens, such as  Colletotrichum nicotianae  Averna and  Alternaria alternate . The enrichment of flavonols components, such as rutin, which directly inhibit the growth of  C. nicotiana e and  A. alternate , may also contribute to the defense mediated by  AtMYB12  over-expression. At the same time, the results also confirm that  AtMYB12-expressing  transgenic tobacco enhanced plant resistance to aphid-infested ( Aphidoidea ) pests. These results suggest that the  AtMYB12  gene is a good candidate for pest and disease control, with limited resistance costs and enrichment in flavonols, and that  AtMYB12  has a potential in the breeding of disease-resistant tobacco crops.

AtMYB12-Expressing Transgenic Tobacco Increases Resistance to Several Phytopathogens and Aphids