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Title: Cell wall composition and biomass recalcitrance differences within a genotypically diverse set of Brachypodium distachyon inbred lines

Journal Article · · Frontiers in Plant Science
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [2];  [6]
  1. Illinois State Univ., Normal, IL (United States). School of Biological Science; Univ. of Wisconsin-Madison, Madison, WI (United States). U.S. Dept. of Energy Great Lakes Bioenergy Research Center
  2. Univ. of Minnesota, St. Paul, MN (United States). Dept. of Agronomy and Plant Genetics; United States Dept. of Agriculture, Agricultural Research Service, St. Paul, MN (United States). Plant Science Research Unit
  3. Michigan State Univ., East Lansing, MI (United States). U.S. Dept. of Energy Great Lakes Bioenergy Research Center
  4. Univ. of Wisconsin-Madison, Madison, WI (United States). U.S. Dept. of Energy Great Lakes Bioenergy Research Center
  5. Univ. of Wisconsin-Madison, Madison, WI (United States). U.S. Dept. of Energy Great Lakes Bioenergy Research Center; Dept. of Biochemistry
  6. Illinois State Univ., Normal, IL (United States). School of Biological Sciences; Univ. of Wisconsin-Madison, Madison, WI (United States). U.S. Dept. of Energy Great Lakes Bioenergy Research Center

Brachypodium distachyon (Brachypodium) has emerged as a useful model system for studying traits unique to graminaceous species including bioenergy crop grasses owing to its amenability to laboratory experimentation and the availability of extensive genetic and germplasm resources. Considerable natural variation has been uncovered for a variety of traits including flowering time, vernalization responsiveness, and above-ground growth characteristics. However, cell wall composition differences remain underexplored. Therefore, we assessed cell wall-related traits relevant to biomass conversion to biofuels in seven Brachypodium inbred lines that were chosen based on their high level of genotypic diversity as well as available genome sequences and recombinant inbred line (RIL) populations. Senesced stems plus leaf sheaths from these lines exhibited significant differences in acetyl bromide soluble lignin (ABSL), cell wall polysaccharide-derived sugars, hydroxycinnamates content, and syringyl:guaiacyl:p-hydroxyphenyl (S:G:H) lignin ratios. Free glucose, sucrose, and starch content also differed significantly in senesced stems, as did the amounts of sugars released from cell wall polysaccharides (digestibility) upon exposure to a panel of thermochemical pretreatments followed by hydrolytic enzymatic digestion. Correlations were identified between inbred line lignin compositions and plant growth characteristics such as biomass accumulation and heading date (HD), and between amounts of cell wall polysaccharides and biomass digestibility. Finally, stem cell wall p-coumarate and ferulate contents and free-sugars content changed significantly with increased duration of vernalization for some inbred lines. Taken together, these results show that Brachypodium displays substantial phenotypic variation with respect to cell wall composition and biomass digestibility, with some compositional differences correlating with growth characteristics. Moreover, besides influencing HD and biomass accumulation, vernalization was found to affect cell wall composition and free sugars accumulation in some Brachypodium inbred lines, suggesting genetic differences in how vernalization affects carbon flux to polysaccharides. Lastly, the availability of related RIL populations will allow for the genetic and molecular dissection of this natural variation, the knowledge of which may inform ways to genetically improve bioenergy crop grasses.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FC02-07ER64494
OSTI ID:
1285953
Journal Information:
Frontiers in Plant Science, Vol. 7; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (6)

Abscisic acid‐mediated modifications of radial apoplastic transport pathway play a key role in cadmium uptake in hyperaccumulator Sedum alfredii journal January 2019
Identification of developmental stage and anatomical fraction contributions to cell wall recalcitrance in switchgrass journal July 2017
Genetic and Quantitative Trait Locus Analysis of Cell Wall Components and Forage Digestibility in the Zheng58 × HD568 Maize RIL Population at Anthesis Stage journal August 2017
Genome-wide association analysis of forage quality in maize mature stalk journal October 2016
Never the Two Shall Mix: Robust Indel Markers to Ensure the Fidelity of Two Pivotal and Closely-Related Accessions of Brachypodium distachyon journal June 2019
Lignin Degradation by Fungal Pretreatment: A Review journal January 2017

Figures / Tables (11)