Transgenic Switchgrass (Panicum Virgatum L.) Targeted for Reduced Recalcitrance to Bioconversion: A 2-Year Comparative Analysis of Field-Grown Lines Modified for Target Gene or Genetic Element Expression

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This article discusses the investigation of clones of plants representing independent transgenic events and their respective nontransgenic control lines for biomass yield, carbohydrate composition and recalcitrance to bioconversion via separate hydrolysis and fermentation to yield ethanol.

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10 p.

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Dumitrache, Alexandru; Natzke, Jace; Rodriguez, Miguel, Jr.; Yee, Kelsey L.; Thompson, Olivia A.; Poovaiah, Charleson R. et al. February 20, 2017.

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This article discusses the investigation of clones of plants representing independent transgenic events and their respective nontransgenic control lines for biomass yield, carbohydrate composition and recalcitrance to bioconversion via separate hydrolysis and fermentation to yield ethanol.

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10 p.

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Abstract: Transgenic Panicum virgatum L. silencing (KD) or overexpressing (OE) specific genes or a small RNA (GAUT4-KD, miRNA156-OE, MYB4-OE, COMT-KD and FPGS-KD) was grown in the field and aerial tissue analysed for biofuel production traits. Clones representing independent transgenic lines were established and senesced tissue was sampled after year 1 and 2 growth cycles. Biomass was analysed for wall sugars, recalcitrance to enzymatic digestibility and biofuel production using separate hydrolysis and fermentation. No correlation was found between plant carbohydrate content and biofuel production pointing to overriding structural and compositional elements that influence recalcitrance. Biomass yields were greater for all lines in the second year as plants establish in the field and standard amounts of biomass analysed from each line had more glucan, xylan and less ethanol (g/g basis) in the second- versus the first-year samples, pointing to a broad increase in tissue recalcitrance after regrowth from the perennial root. However, biomass from second-year growth of transgenics targeted for wall modification, GAUT4-KD, MYB4-OE, COMT-KD and FPGS-KD, had increased carbohydrate and ethanol yields (up to 12% and 21%, respectively) compared with control samples. The parental plant lines were found to have a significant impact on recalcitrance which can be exploited in future strategies. This summarizes progress towards generating next-generation bio-feedstocks with improved properties for microbial and enzymatic deconstruction, while providing a comprehensive quantitative analysis for the bioconversion of multiple plant lines in five transgenic strategies.

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  • Plant Biotechnology Journal, 2017. Hoboken, NJ: John Wiley & Sons

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  • Publication Title: Plant Biotechnology Journal
  • Volume: 15
  • Pages: 10
  • Page Start: 688
  • Page End: 697
  • Peer Reviewed: Yes

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  • August 18, 2016

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  • November 16, 2016

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  • February 20, 2017

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  • Dec. 14, 2017, 11:26 a.m.

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  • Nov. 2, 2023, 1:44 p.m.

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Thumbnail image of item number 1 in: 'Transgenic Switchgrass (Panicum Virgatum L.) Targeted for Reduced Recalcitrance to Bioconversion: A 2-Year Comparative Analysis of Field-Grown Lines Modified for Target Gene or Genetic Element Expression'.
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Dumitrache, Alexandru; Natzke, Jace; Rodriguez, Miguel, Jr.; Yee, Kelsey L.; Thompson, Olivia A.; Poovaiah, Charleson R. et al. Transgenic Switchgrass (Panicum Virgatum L.) Targeted for Reduced Recalcitrance to Bioconversion: A 2-Year Comparative Analysis of Field-Grown Lines Modified for Target Gene or Genetic Element Expression, article, February 20, 2017; London, United Kingdom. (https://digital.library.unt.edu/ark:/67531/metadc1049700/: accessed May 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.

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