Plant Diversity ›› 2017, Vol. 39 ›› Issue (05): 300-307.DOI: 10.1016/j.pld.2017.05.007

• Articles • Previous Articles    

Intraspecific DNA methylation polymorphism in the non-edible oilseed plant castor bean

Shan Hea,b, Wei Xua, Fei Lia, Yue Wanga, Aizhong Liua   

  1. a Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-03-12 Revised:2017-05-27 Online:2017-10-25 Published:2021-11-05
  • Contact: Aizhong Liu
  • Supported by:
    This work was jointly supported by Chinese National Key Technology R & D Program (2015BAD15B02) and National Natural Science Foundation of China (31661143002 and 31501034).

Abstract: Investigation of the relationships of phenotypic and epigenetic variations might be a good way to dissect the genetic or molecular basis of phenotypic variation and plasticity in plants. Castor bean (Ricinus communis L.), an important non-edible oilseed crop, is a mono-species genus plant in the family Euphorbiaceae. Since it displays rich phenotypic variations with low genetic diversity, castor bean is a good model to investigate the molecular basis of phenotypic and epigenetic variations. Cytosine DNA methylation represents a major molecular mechanism of epigenetic occurrence. In this study, epigenetic diversity of sixty landrace accessions collected worldwide was investigated using the methylationsensitive amplification polymorphism (MSAP) technique. Results showed that the epigenetic diversity (based on the polymorphism of DNA methylated loci) exhibited a medium variation (Ne=1.395, He=0.242, I=0.366) at the population level though the variation was great, ranging from 3.80% to 34.31% among accessions. Both population structure analysis and the phylogenetic construction (using the neighbor-joining criteria) revealed that the two main clades were identified, but they did not display a distinct geographic structure. After inspecting the location of polymorphic methylated loci on genome we identified that the polymorphic methylated loci occur widely in nuclear and organelle genomes. This study provides new data to understand phenotypic and epigenetic variations in castor bean.

Key words: Ricinus communis L., Epigenetic diversity, Methylation-sensitive amplification, polymorphism, DNA methylation