Engineering pasture grasses genetically is far harder than reported
Yaoyu T, Xiang X, Peizhi Y, Xiaoxia S
Crispr
The clover and ryegrass mixes grazing animals depend on for feed are notoriously resistant to lab modification, which is part of why drought-tolerant or higher-yield forage varieties take so long to reach farmers.
Researchers looked at every major technique scientists use to genetically modify forage crops, the grasses and legumes grown as animal feed, and found a messy picture: a method that works great on one plant variety often fails completely on a close relative. Some newer tricks, like using special genes to force stubborn plant tissue to regenerate, show real promise for grasses that used to be nearly impossible to modify, but flashier tools like nanoparticle delivery and virus-based editing haven't actually been proven to produce stable, breedable plants yet.
Key Findings
Transformation efficiency in forage crops is strongly dependent on species, genotype, plant tissue used, and how success is measured, making cross-study comparisons unreliable
Developmental regulator genes have documented proof-of-concept success in regenerating previously recalcitrant (hard-to-regenerate) forage grasses
Nanomaterial-based delivery and virus-induced heritable gene editing remain unvalidated for producing stable, fertile forage crop plants
chevron_right Technical Summary
Scientists reviewing decades of research on genetically engineering pasture grasses and forage legumes (like alfalfa and ryegrass) found that success is highly inconsistent and depends heavily on the specific plant variety, meaning claims of universal, easy gene-editing methods for these crops are overstated.
Abstract Preview
Original paper
Genetic transformation of forage crops: comparative barriers, evidence, and emerging strategies.
Forage crops include phylogenetically and biologically distinct legumes and grasses, and their genetic transformation is constrained by different combinations of host response, DNA-delivery efficie...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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