Abstract
Transcription factors (TFs) are indispensable regulators of plant response to abiotic stress and play an important role in the whole growth and development process. HD-ZIP proteins constitute a large family of transcription factors that are found only in plants and are divided into four subfamilies (HD-ZIP I–IV). HD-ZIP I subfamily genes mainly participate in response to extreme environments such as drought and osmotic stress and treatments of ABA and ethylene. Here, we identified 17 HD-ZIP I subfamily genes in the maize genome using the hidden Markov model (HMM), which distributed non-uniformly on six chromosomes of maize and were more closely related to rice than to Arabidopsis . Furthermore, these HD-ZIP I subfamily genes exhibited multiple expression patterns in seven tissues, showing strong tissues-specific expression. Moreover, maize HD-ZIP I subfamily genes showed different response patterns and degrees to different stresses, such as high salinity, waterlogging and cold stress. In addition, maize HD-ZIP I subfamily genes also showed a complex response pattern under treatment of five different hormones. These results provide valuable reference information for dissecting function and molecular mechanism of HD-ZIP I subfamily genes in maize.
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