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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (1): 41-61.doi: 10.16420/j.issn.0513-353x.2020-0726

• Research Papers • Previous Articles     Next Articles

Evolutionary Dynamics Investigation and the Expression Analysis of Chromatin Remodeling Factor Snf2 Gene Family During Early Somatic Embryogenesis in Dimocarpus longan

SHEN Xu, CHEN Xiaohui, ZHANG Jing, CHEN Rongzhu, XU Xiaoping, LI Xiaofei, JIANG Mengqi, LIU Pudong, NI Shanshan, LIN Yuling, LAI Zhongxiong()   

  1. Institute of Horticultural Biotechnology,Fujian Agriculture and Forestry University,Fuzhou 350002,China
  • Received:2021-09-15 Revised:2021-12-17 Online:2022-01-25 Published:2022-01-24
  • Contact: LAI Zhongxiong E-mail:laizx01@163.com

Abstract:

EC(embryogenic callus),ICpEC(incomplete embryogenic compact structures)and GE(globular embryos)of the early somatic embryogenesis(SE)of Dimocarpus longan Lour.‘Honghezi’were used as experimental materials. Using bioinformatic methods identified and analyzed the members and its molecular evolutionary characteristic of longan chromatin remodeling factor DlSnf2 family,and the expression patterns of DlSnf2 gene family were analyzed through transcriptome data and real-time quantitative PCR(qRT-PCR). The longan DlSnf2 family contains 35 members,and expansion of the family is mainly driven by whole-genomic or segmental duplication events. 31 members of containing SNF2_N and HELICc domains were selected and divided into 19 subfamilies under six categories depending on the evolutionary characteristics. Protein interaction,microRNA and promoter prediction showed that partial members can interact each other,almost all genes may be potentially regulated by microRNA and exist a large number of cis-acting elements related to hormone,stress,light,growth and development;Transcriptome and qRT-PCR analysis showed that most genes were highly expressed in ICpEC,and the expressions of DlCHR18,DlCHR24,DlCHR25,DlCHR29 and DlCHR31a were gradually decreased from EC to GE,while DlCHR4,DlCHR15 and DlCHR42 gradually increased;The analysis exhibited that DlSnf2 family genes responded to 2,4-D,ABA,ethrel,Methyl jasmonate,4 ℃ and 40 ℃. Expressions of DlCHR10 and DlCHR11 are up regulated by ethrel,while DlCHR28b and DlCHR36 are down regulated. DlCHR11 is down regulated by ABA and high temperature,DlCHR10 is down regulated by Methyl Jasmonate,DlCHR36 is down regulated by low temperature,and DlCHR24 and DlCHR35 are down regulated by high temperature. The Snf2 gene family may have relatively conservative functions and certain species specificity during plant evolution. Under plant growth regulator and temperature treatments,longan DlSnf2 family members may be involved in regulating somatic embryogenesis and resisting high and low temperature stress,and it is speculated that other epigenetic regulatory mechanisms such as DNA methylation,microRNA and histone modification are involved in the process.

Key words: Dimocarpus longan, chromatin remodeling factor Snf2, evolution, somatic embryogenesis, epigenetic regulation

CLC Number: