Biotechnology Bulletin ›› 2024, Vol. 40 ›› Issue (2): 300-312.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0719

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Identification and Expression Analysis of Calcium-dependent Protein Kinase(CDPK)Family in Haematococcus pluvialis

LI Ya-nan1(), ZHANG Hao-jie1, LIANG Meng-jing1, LUO Tao1, LI Wang-ning1, ZHANG Chun-hui1, JI Chun-li1, LI Run-zhi1, XUE Jin-ai1(), CUI Hong-li1,2()   

  1. 1. College of Agriculture, Shanxi Agricultural University, Institute of Molecular Agriculture and Bioenergy, Taigu 030801
    2. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Key Laboratory of Coastal Biology and Bioresource Utilization, Yantai 264003
  • Received:2023-07-23 Online:2024-02-26 Published:2024-03-13
  • Contact: XUE Jin-ai, CUI Hong-li E-mail:Li_yanan_li@163.com;306214803@qq.com;cuihongli@sxau.edu.cn

Abstract:

【Objective】 Calcium-dependent protein kinases(CDPK or CPK)are widely involved in plant growth and development and environmental stress response. To explore their roles involved in Haematococcus pluvialis growth, development and astaxanthin accumulation, HpCDPK gene family was identified and analyzed. 【Method】 Bioinformatics tools were used to identify the HpCDPK gene family members, and to analyze the physical and chemical properties, phylogenetic evolution, conserved motifs and functional domains of the encoded proteins, as well as the gene expression profiles under nitrogen deficiency stress. 【Result】 The results showed that seven members of HpCDPK gene family were identified, and all HpCDPK proteins contained typical EF-hand motifs and protein kinase domains. Phylogenetic analysis showed that these HpCDPKs clustered with the CrCDPKs from Chlamydomonas reinhartii and separated from the AtCDPKs of Arabidopsis thaliana, suggesting that species-specific gene replication occurred in the process of evolution. Transcriptome data analysis showed that HpCDPK gene expression was induced by a variety of stresses, among which the transcription level of HpCDPK7 gene was most significantly up-regulated under nitrogen deficiency. In addition, the analysis of the correlation between HpCDPK and the expression of genes related to carotenoid synthesis showed that HpCDPK was closely related to the expressions of genes relevant to several carotenoid synthesis in H. pluvialis, especially HpCDPK2 was positively correlated with the expression of key genes of astaxanthin synthesis(BKT and BCH). 【Conclusion】 Seven HpCDPK genes were identified, the expression of HpCDPK7 gene was most significantly up-regulated under nitrogen deficiency and HpCDPK2 may play an active role in the synthesis and accumulation of carotenoids and astaxanthin. The results provide a reference basis for further analysis of the function and molecular mechanism of stress response and carotenoids synthesis and accumulation mediated by HpCDPK in H. pluvialis.

Key words: Haematococcus pluvialis, calcium-dependent protein kinase, sequence analysis, expression pattern, abiotic stress