Scientists used CRISPR gene editing to confirm that a single plant enzyme performs two critical jobs at once: protecting cells from oxidative damage and building lignin, the woody material that gives plants their structure and strength. Disrupting this dual-purpose enzyme in grasses and poplar trees stunted growth and weakened cell walls, revealing that lignin production is the primary driver of healthy plant development.
1
CRISPR knockout of the C3H/APX gene in Brachypodium grass reduced lignin content and altered its chemical composition, causing impaired growth that was rescued by supplying caffeate or ferulate externally.
2
Elevated hydrogen peroxide (H2O2) in knockout mutants was not the cause of growth defects — adding catalase to neutralize H2O2 did not restore plant growth, pointing to disrupted lignin biosynthesis as the primary culprit.
3
Double-gene knockouts (both C3H/APX paralogs) caused severe developmental failure in both species: near-lethality in Brachypodium and complete inability to regenerate from tissue culture in poplar.
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