Chromosome-level genome assemblies of the parental lines of GCH-7, a high-performing castor (Ricinus communis L.) hybrid

Résumé fourni par la source

Gujarat Castor Hybrid-7 (GCH-7) is a high-performing castor ( Ricinus communis L.) variety developed from the parental lines SKI-215 and SKP-84. This variety holds significant economic importance, as it is a high yielding hybrid variety and its seeds are widely used for castor oil production. In this study, we report the first high-quality genome assemblies of the parental lines of GCH-7, SKI-215 and SKP-84, generated using Oxford Nanopore sequencing and polished with Illumina data. The assembled genome sizes were 310.23 Mb and 325.63 Mb, with N50 values of 30.21 Mb and 32.12 Mb for SKI-215 and SKP-84, respectively. The assemblies exhibited high completeness (BUSCO: 98.6% and 98.8%) and base-level accuracy (Merqury QV: 42.87 and 46.50) for SKI-215 and SKP-84, respectively. Genome annotation identified 18,620 in SKI-215 and 18,598 in SKP-84. Repetitive sequences constituted 31.62% and 31.76% of the SKI-215 and SKP-84 genomes. In addition, complete chloroplast and mitochondrial genomes were assembled and anchored to the nuclear genomes. These high-quality parental genome assemblies provide a valuable resource for genetic studies, plant breeding and offer practical applications in genetic purity testing of GCH-7 seeds.

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