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Characterization of Annexin gene family and functional analysis of RsANN1a involved in heat tolerance in radish (Raphanus sativus L.)

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Abstract

Plant annexins are a kind of conserved Ca2+-dependent phospholipid-binding proteins which are involved in plant growth, development and stress tolerance. Radish is an economically important annual or biennial root vegetable crop worldwide. However, the genome-wide characterization of annexin (RsANN) gene family remain largely unexplored in radish. In this study, a comprehensive identification of annexin gene family was performed at the whole genome level in radish. In total, ten RsANN genes were identified, and these putative RsANN proteins shared typical characteristics of the annexin family proteins. Phylogenetic analysis showed that the RsANNs together with annexin from Arabidopsis and rice were clustered into five groups with shared similar motif patterns. Chromosomal localization showed that these ten RsANN genes were distributed on six chromosomes (R3-R8) of radish. Several cis-elements involved in abiotic stress response were identified in the promoter regions of RsANN genes. Expression profile analysis indicated that the RsANN genes exhibited tissue-specific patterns at different growth stages and tissues. The Real-time quantitative PCR (RT-qPCR) revealed that the expression of most RsANN genes was induced under various abiotic stresses including heat, drought, salinity, oxidization and ABA stress. In addition, stress assays showed that overexpression of RsANN1a improved plant’s growth and heat tolerance, while artificial microRNAs (amiRNA)-mediated knockdown of RsANN1a caused dramatically decreased survival ratio of Arabidopsis plants. These findings not only demonstrate that RsANN1a might play a critical role in the heat stress response of radish, but also facilitate clarifying the molecular mechanism of RsANN genes in regulating the biological process governing plant growth and development.

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Funding

This current work was funded by grants from the Jiangsu Agricultural Science and Technology Innovation Fund (JASTIF, CX(19)3032), National Natural Science Foundation of China (NSFC 32102399) and the project funded by the priority academic program development of Jiangsu Higher Education Institutions (PAPD).

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SF, XL and LL conceived and designed the experiments. SF, YJ and SX performed the experiments. SF and YJ wrote the manuscript. WJ, WY, MY and ZY reviewed and revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Liwang Liu.

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All authors declared that there is no conflict of interest.

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Shen, F., Ying, J., Xu, L. et al. Characterization of Annexin gene family and functional analysis of RsANN1a involved in heat tolerance in radish (Raphanus sativus L.). Physiol Mol Biol Plants 27, 2027–2041 (2021). https://doi.org/10.1007/s12298-021-01056-5

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  • DOI: https://doi.org/10.1007/s12298-021-01056-5

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