Deleting all seven plant maintenance genes slows sprouting, stunts roots, and delays leaf drop
Shao D, Wen X, Luo Q, Liu X, Li L
Crispr
Every time a seed on your windowsill fails to sprout or a seedling's roots stall out, the molecular handshakes between stress-response proteins and growth hormones are part of the story, and this research maps one key piece of that network.
Plants have a family of seven genes that act like a maintenance crew, helping proteins fold correctly and deciding when leaves should age and fall. Scientists deleted all seven at once in a lab plant and watched what broke: seeds sprouted late, roots stayed short, leaves hung on longer than they should. They also found that these genes are connected to auxin, the hormone that tells roots to grow, because adding auxin back partially fixed the root problem.
Key Findings
Deleting all 7 BAG genes produced plants with shorter roots, smaller rosettes, reduced height, delayed seed germination, and delayed leaf senescence compared to normal plants.
Genes responsible for auxin production and signaling were downregulated in the 7-gene mutant, and applying the auxin hormone IAA externally partially rescued root elongation defects.
Senescence-associated genes and senescence-promoting transcription factors were both downregulated in the mutant, explaining why its leaves aged more slowly.
chevron_right Technical Summary
Researchers knocked out all seven BAG genes in Arabidopsis simultaneously, revealing that these protein-helper genes collectively control seed germination, root growth, plant size, and leaf aging. The work shows these genes act redundantly and are linked to the plant hormone auxin.
Abstract Preview
Original paper
Combined T-DNA and CRISPR/Cas9 mutagenesis reveals redundant developmental roles of the Arabidopsis BAG family.
BAG (Bcl-2-associated athanogene) genes encode evolutionarily conserved co-chaperones that participate in proteostasis regulation, stress responses, and programmed cell death. However, their collec...
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