| Summary: | YABBY is a specific transcription factor gene family in plants. It has the typical N-terminal C2C2-type zinc-finger domain and the C-terminal YABBY conservative structure domain, which play an important role in the development of the leaves and floral organs. The <i>YABBY</i> gene family directs leaf polarity in mango, playing an important role in maintaining species specificity. In this study, a total of seven <i>YABBY</i> genes were identified in the mango (<i>Mangifera indica</i>) genome. The seven YABBY family members possessed both typical C2C2 and YABBY domains. A phylogenetic tree was constructed based on the amino acid sequences of the 42 YABBY proteins of mango, <i>Arabidopsis</i>, apple, grape, and peach. The phylogenetic tree indicated that the members of the mango YABBY family could be divided into three subfamilies, including CRC, YAB5, and YAB3. Quantitative real-time PCR showed that the transcription levels of the <i>MiYABBYs</i> were significantly different under biotic and abiotic stresses. The transcription level of <i>MiYABBY7</i> was significantly down-regulated at 0–72 h after <i>Xanthomonas campestris</i> pv. <i>mangiferaeindicae</i> infection, methyl jasmonate and salicylic acid stresses. The <i>MiYABBY1</i> transcription level was significantly down-regulated at 0–72 h after <i>Colletotrichum gloeosporioides</i> infection. <i>MiYABBYs</i> were expressed specifically in different leaves and fruit, and <i>MiYABBY6</i> was significantly up-regulated during leaf and fruit development. However, <i>MiYABBY5</i> showed a contrary transcriptional pattern during leaf and fruit development. This is first report on the mango <i>YABBY</i> gene family at the genome-wide level. These results will be beneficial for understanding the biological functions and molecular mechanisms of <i>YABBY</i> genes.
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