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- W2754982446 abstract "Abstract Brown midrib (bmr) mutants in sorghum ( Sorghum bicolor (L.) Moench) and several other C4 grasses are associated with reduced lignin concentration, altered lignin composition and improved cell wall digestibility, which are desirable properties in biomass development for the emerging lignocellulosic biofuel industry. Studying bmr mutants has considerably expanded our understanding of the molecular basis underlying lignin biosynthesis and perturbation in grasses. In this study, we performed quantitative trait locus (QTL) analysis, identified and cloned a novel cinnamyl alcohol dehydrogenase allele ( SbCAD2 ) that has an 8-bp deletion in its 5′-untranslated region (UTR), conferring the spontaneous brown midrib trait and lignin reduction in the sorghum germplasm line PI 595743. Complementation test and gene expression analysis revealed that this non-coding region alteration is associated with the significantly reduced expression of the SbCAD2 in PI 595743 throughout its growth stages. Moreover, a promoter-GUS fusion study with transgenic Arabidopsis thaliana plants found that SbCAD2 promoter is functionally conserved, driving a specific expression pattern in lignifying vascular tissues. Taken together, our results revealed the genetic basis of bmr occurrence in this spontaneous sorghum mutant and suggested the regulatory region of the SbCAD2 can be a target site for optimizing lignin modification in sorghum and other bioenergy crops." @default.
- W2754982446 created "2017-09-25" @default.
- W2754982446 creator A5038694564 @default.
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- W2754982446 date "2017-09-15" @default.
- W2754982446 modified "2023-10-13" @default.
- W2754982446 title "Expression of brown-midrib in a spontaneous sorghum mutant is linked to a 5′-UTR deletion in lignin biosynthesis gene SbCAD2" @default.
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- W2754982446 doi "https://doi.org/10.1038/s41598-017-10119-1" @default.
- W2754982446 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5601950" @default.
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