Fig. 1.

Characteristics of M. truncatula lncRNAs. a The expression level of lncRNAs (log₁₀FPKM) along the eight M. truncatula chromosomes. It comprises six concentric rings, and each corresponds to a different sample. They are control in leaves (CK-L), control in roots (CK-R), osmotic stress in leaves (OS-L), osmotic stress in roots (OS-R), salt stress in leaves (SS-L) and salt stress in roots (SS-R) from outer to inner, respectively. b Distribution of different types of lncRNAs. The intronic, intergenic and sense/antisense lncRNAs are represented by different concentric rings from outer to inner, according to the loci of lncRNAs in the genome. c Length distribution of lncRNAs. d Accumulative frequency of lncRNAs and mRNAs in two control samples. Data from other samples is shown in Additional file 1: Figure S2. e Composition of different types of lncRNAs