cereal-genomics
Cereal genomics is the study of the genome sequences, structure, and gene functions of grain crops such as wheat, rice, maize, and barley. By mapping genetic variation and identifying genes linked to traits like yield, disease resistance, and stress tolerance, this field enables researchers to accelerate breeding programs and develop more resilient, productive crop varieties. It also provides insight into the evolutionary history and domestication of grasses that form the backbone of global food security.
open_in_new WikipediaPubMed · 2026-07-04
Scientists identified the gene behind barley's 'orange lemma' mutation, a long-mysterious color change in husks. The culprit is CAD, an enzyme that helps build lignin; when it's broken, husks turn orange and lignin drops, making the grain and straw easier to digest and convert to biofuel.
The CAD gene on chromosome 6H is the sole cause of the orange lemma phenotype in barley, confirmed across naturally occurring mutants, EMS-induced lines, and CRISPR knockout plants.
CRISPR/Cas9 knockout of CAD in the 'Golden Promise' cultivar reproduced the orange husk color and produced significantly lower lignin content than wild-type plants.
All orange lemma mutants carried nucleotide changes in CAD resulting in amino acid substitutions or premature stop codons, explaining decades of observed phenotypic variation.
