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Variations in the cell wall composition of maize brown midrib mutants
Jane M Marita1, Wilfred Vermerris, John Ralph
1U.S. Dairy Forage Research Center, Agricultural Research Service, U.S. Department of Agriculture, Madison, Wisconsin 53706, USA.
Journal of Agricultural and Food Chemistry
|February 20, 2003
Summary
This study details brown midrib (bm) mutants in maize stalks, revealing unique lignin and cell wall changes. These findings offer insights into maize genetic diversity and biomass composition.
Area of Science:
- Plant Biology
- Biochemistry
- Genetics
Background:
- Previous studies on maize brown midrib (bm) mutants (bm1, bm2, bm3, bm4) lacked comparative analysis due to varied genetic backgrounds.
- This limitation hindered detailed understanding of individual bm mutant impacts on plant structure and composition.
Purpose of the Study:
- To conduct a comparative analysis of four bm single mutants and a bm1-bm2 double mutant in maize.
- To investigate structural and compositional changes in isolated cell walls and lignins within a common genetic background (inbred A619).
Main Methods:
- Utilized a common genetic background (inbred A619) for all maize mutants.
- Performed detailed analyses of isolated cell walls and lignins using 2D-NMR and 1D (13)C NMR spectroscopy.
- Quantified Klason lignin, esterified p-coumaric acid, and ferulate levels.
Main Results:
- bm3 lignin showed a significant presence of benzodioxane units (2D-NMR).
- bm1 and bm1-bm2 mutants exhibited increased aldehyde levels (1D (13)C NMR).
- bm3 and bm1-bm2 mutants had reduced Klason lignin; bm1, bm3, and bm1-bm2 mutants showed decreased esterified p-coumaric acid and elevated ferulate (bm3).
Conclusions:
- Maize bm mutations induce distinct changes in cell wall composition and lignin structure.
- Differences in p-coumaric acid-lignin complex solubility suggest varied lignin organization among bm mutants.
- This research provides a foundational comparative dataset for maize bm mutants.