Illumina HiSeq 3000 sequencing; RNAseq of Sinorhizobium meliloti 1021 treated with the chemically synthesized peptide DgDef1 delta SP delta CTPP (representing a truncated variant of the Defensin-like peptide DgDef1 from the actinorhizal plant Datisca glomerata) against an untreated control