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Background  Improving saccharification efficiency in bioenergy crop species remains an important challenge. Here, we report the characterization of a Sorghum ( Sorghum bicolor  L.) mutant, named  REDforGREEN  ( RG ), as a bioenergy feedstock.    Results  It was found that  RG  displayed increased accumulation of lignin in leaves and depletion in the stems, antithetic to the trend observed in wild type. Consistent with these measurements, the  RG  leaf tissue displayed reduced saccharification efficiency whereas the stem saccharification efficiency increased relative to wild type. Reduced lignin was linked to improved saccharification in  RG  stems, but a chemical shift to greater S:G ratios in  RG  stem lignin was also observed. Similarities in cellulose content and structure by XRD-analysis support the correlation between increased saccharification properties and reduced lignin instead of changes in the cellulose composition and/or structure.    Conclusion  Antithetic lignin accumulation was observed in the  RG  mutant leaf-and stem-tissue, which resulted in greater saccharification efficiency in the  RG  stem and differential thermochemical product yield in high lignin leaves. Thus, the red leaf coloration of the  RG  mutant represents a potential marker for improved conversion of stem cellulose to fermentable sugars in the C4 grass Sorghum.

Sorghum mutant RGdisplays antithetic leaf shoot lignin accumulation resulting in improved stem saccharification properties