Scientists edit tree genes without foreign DNA using cell soup
Shao Y, Chang L, He Y, Xie Z, Qi K
Crispr
The pears, apples, and other orchard fruits you buy take years to breed better versions of because trees are slow and stubborn to genetically test, and this shortcut could speed up disease-resistant or climate-tougher varieties reaching growers.
Breeding better trees is painfully slow because you normally have to grow a whole tree just to see if a gene edit worked. Researchers figured out how to strip the tough outer wall off pear plant cells, edit several genes at once using a DNA-free gene-editing tool, and watch the results happen right in that single cell, no years-long tree-growing required. They tested it by breaking three genes that control how chloroplasts (the parts of cells that do photosynthesis) divide, and watched the cell's whole stress-alarm system light up in response, proving the method actually works for studying complicated traits in woody plants.
Key Findings
Developed an optimized protoplast isolation protocol for pear using 1.0% cellulase R10 and 0.4% macerozyme R10 with 8.5-hour digestion, and validated the approach across seven other economically important woody plant species
Combined 40% PEG-4000 transfection with DNA-free CRISPR/Cas9 ribonucleoprotein delivery to simultaneously disrupt three chloroplast division genes (ARC3, PARC6, FtsZ2-1a) in a single pear cell, reliably producing abnormal 'macro-chloroplast' phenotypes
Disrupting chloroplast division triggered chloroplast-to-nucleus stress signaling, shown by activation of nuclear stress genes RBOHD and ZAT12, a spike in reactive oxygen species, and progressive cell damage
chevron_right Technical Summary
Scientists developed a fast method to edit multiple genes at once in pear plant cells without inserting any foreign DNA, then used it to show that disrupting chloroplast division triggers a stress alarm inside the cell. The technique works across eight different woody plant species, opening a path to much faster breeding of trees and orchard crops.
Abstract Preview
Original paper
An efficient woody plant protoplast platform enables transgene-free multiplex genome editing and rapid trait validation in pear.
Multiplex editing is crucial for analysing complex multiple-gene traits in woody plants, yet its application remains limited because of low transformation efficiency and lengthy regeneration cycles...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Pears are a genus of trees, Pyrus, in the family Rosaceae, that bear an edible apple-like fruit of the same name. Several species of pears are cultivated for their fruit and juices, while others are grown as ornamental flowering trees.