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Promoters of Arabidopsis Casein kinase I-like 2 and 7 confer specific high-temperature response in anther

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(1) We systematically analyze the promoter activities of AtCKLs in various tissues; (2) AtCKL2 and AtCKL7 were expressed in early developmental anthers under high temperature (HT) conditions; (3) AtMYB24 may function as a positive regulator of AtCKL2 and AtCKL7 expression under HT.

Abstract

High temperature (HT) can seriously impede plant growth and development, causing severe loss of crop production. In Arabidopsis, AtCKL genes show high similarity to GhCKI, a gene reported to disrupt tapetal programmed cell death in cotton. However, most of AtCKL genes are not well characterized. Here, we systematically analyzed the expression patterns of AtCKLs in various tissues. The expression of AtCKL2 and AtCKL7 was induced in early anther development under HT, which is similar to the case of GhCKI. In silico analysis of AtCKL2 and AtCKL7 promoters indicated that four types of transcription factors (TFs) (MADS, NAC, WRKY and R2R3-MYB) might bind to AtCKL2 and AtCKL7 promoters. Furthermore, three MADS, three NAC, one WRKY, and three R2R3-MYB TFs were up-regulated in stage 1–8 anthers and three R2R3-MYB TFs were up-regulated in stage 9–10 anthers under HT, implying the important roles of R2R3-MYB genes in the response of anthers to HT. Among the R2R3-MYB genes, AtMYB24 showed the similar expression as AtCKL2 and AtCKL7 in the anthers under HT. Additionally, yeast one-hybrid and dual-luciferase reporter system assays verified that AtMYB24 could bind to AtCKL2 and AtCKL7 promoters and activate the expression of these two genes. In brief, this study provides the overall expression profiles of AtCKLs, useful information for unraveling the molecular mechanism of AtCKL2 and AtCKL7 gene expression in early anther development under HT, and important clues for elucidating the mechanism of transcriptional regulation of CKI genes in plant anther under HT, which are critical to the reduction of crop yield loss resulting from HT.

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Acknowledgements

We thank Daiyin Chao (National Key Laboratory of Plant Molecular Genetics, Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, China) for kindly providing myb24 (SALK_017221C) mutant seeds. This work was supported by the Fundamental Research Funds for the Central Universities (Program No. 2662016QD013), the National Natural Science Foundation of China (31401423) and the National Key Research and Development Program of China (2018YFD0100403).

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  1. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China

    Yaoyao Li, Ling Min, Lin Zhang, Qin Hu, Yuanlong Wu, Jie Li, Sai Xie, Yizan Ma, Xianlong Zhang & Longfu Zhu

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  1. Yaoyao Li
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  2. Ling Min
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  3. Lin Zhang
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Contributions

YL carried out the experiment with LZ, QH, YW, JL, SX, and YM, and wrote the main manuscript text. LZ, LM and XZ designed and supervised the research and revised the manuscript. All authors reviewed the manuscript.

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Correspondence to Ling Min or Longfu Zhu.

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Li, Y., Min, L., Zhang, L. et al. Promoters of Arabidopsis Casein kinase I-like 2 and 7 confer specific high-temperature response in anther. Plant Mol Biol 98, 33–49 (2018). https://doi.org/10.1007/s11103-018-0760-7

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