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<p>Heterosis is a widely exploited phenomenon for optimizing traits and improving yields in hybrids. Although CSH 22SS is the only nationally released and approved sweet sorghum hybrid for commercial cultivation in India, the underlying molecular basis of its higher Brix content and biomass accumulation remains unexplored. In this study, we investigate the molecular components associated with the superior performance of the hybrid using whole-genome transcriptome analysis of stem internodes at three successive developmental stages of the hybrid in comparison to its corresponding parents. Differential expression analysis, coupled with pathway mapping and WGCNA analysis, revealed significant enrichment of genes involved in carbohydrate metabolism, cell wall metabolism, nitrogen assimilation, and sugar transport in the hybrid. Furthermore, the analysis of gene expression inheritance concluded that non-additive interactions have a predominant influence on the heterotic behavior of CSH 22SS. The study also highlights candidate genes that contribute to optimal carbon partitioning, leading to enhanced sugar reserves in the hybrid.</p>

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Comparative Transcriptome Profiling Suggests Non-Additive Interactions Significantly Contribute to the Heterotic Behaviour of Sweet Sorghum Hybrid CSH 22SS

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Neeraj Kumar,
  • Ira Vashisht,
  • Karthick B. Sivakumar,
  • Sai Krishna Nikhil,
  • A. V. Umakanth,
  • Ashwani Pareek,
  • Rita A. Sharma,
  • Manoj K. Sharma

摘要

Heterosis is a widely exploited phenomenon for optimizing traits and improving yields in hybrids. Although CSH 22SS is the only nationally released and approved sweet sorghum hybrid for commercial cultivation in India, the underlying molecular basis of its higher Brix content and biomass accumulation remains unexplored. In this study, we investigate the molecular components associated with the superior performance of the hybrid using whole-genome transcriptome analysis of stem internodes at three successive developmental stages of the hybrid in comparison to its corresponding parents. Differential expression analysis, coupled with pathway mapping and WGCNA analysis, revealed significant enrichment of genes involved in carbohydrate metabolism, cell wall metabolism, nitrogen assimilation, and sugar transport in the hybrid. Furthermore, the analysis of gene expression inheritance concluded that non-additive interactions have a predominant influence on the heterotic behavior of CSH 22SS. The study also highlights candidate genes that contribute to optimal carbon partitioning, leading to enhanced sugar reserves in the hybrid.