The whole chloroplast genome of Secale strictum subsp. kuprijanovii, a wild and perennial kinship to cultivated rye.

Secale strictum subsp. kuprijanovii is a perennial, hermaphrodite wild rye species and a progenitor of the modern cultivated rye, Secale cereale. With high adaptive capacity in stress conditions, it is valuable for enriching the germplasm resources of rye. Therefore, to elucidate its genetic and phylogenetic relationship is of great importance. We hereby sequenced, assembled and presented for the first time the complete chloroplast genome of this less studied species. The whole genome is 137,079 bp in size, including a large single copy region of 81,099 bp, a small single copy region of 12,820 bp and two separated inverted repeat regions of 43,160 bp. A total of 109 unique genes were annotated, including 67 protein-coding genes, 38 tRNA genes and 4 rRNA genes. Phylogenetic analysis showed that Secale strictum subsp. kuprijanovii clustered most closely with Secale cereal. A remarkably close evolutionary relationship of S.strictum subsp. kuprijanovii with various wheat varieties may indicate its usage as a genetic resource for the breeding of both the cultivated rye and wheat.