Abstract
MYB transcription factors are widely involved in the development of and physiological processes in plants. Here, we isolated the chrysanthemum R2R3-MYB family transcription factor CmMYB15, a homologous gene of AtMYB15. It was demonstrated that CmMYB15 expression was induced by aphids and that CmMYB15 could bind to AC elements, which usually exist in the promoter of lignin biosynthesis genes. Overexpression of CmMYB15 in chrysanthemum enhanced the resistance of aphids. Additionally, the content of lignin and the expression of several lignin biosynthesis genes increased. In summary, the results indicate that CmMYB15 regulates lignin biosynthesis genes that enhance the resistance of chrysanthemum to aphids.
Highlights
Introduction Members of theMYB family, one of the largest transcription factor families in plants, have a common conserved N-terminal MYB domain consisting of imperfect amino acid repeats of ~52 amino acids[1]
CmMYB15 is a MYB transcription factor MYB transcription factors, which are widely distributed in plants, play an important role in regulating a variety of processes in plants[1]
Most R2R3-MYB and 3R-MYB subfamilies in Arabidopsis are divided into 16 groups with different functions, such as involvement in stress responses, primary and secondary metabolism, lignin biosynthesis or wall deposition, cell wall thickening, cell differentiation or embryogenesis, the cell cycle, anther development, stomatal development and meristem formation[3,25]
Summary
MYB family, one of the largest transcription factor families in plants, have a common conserved N-terminal MYB domain consisting of imperfect amino acid repeats of ~52 amino acids[1]. These members are generally divided into four classes, 1R-, R2R3-, 3Rand 4R-MYB proteins, according to the number of adjacent repeats, with the R2R3-MYB subfamily comprising one of the largest families of transcription factors in plants[2]. MYBs have been shown to be key factors involved in vital regulatory networks that regulate physiological and biochemical processes, for instance, plant development, responses to biotic and abiotic stress[3], and primary and secondary metabolism, such as flavonoid biosynthesis and phenylpropanoid metabolism[4,5]. Analysis of promoter sequences showed that most of these genes contain one or more AC-
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