One gene edit gives tomatoes a simpler root and salt tolerance
Molesini B, Fortini D, Agostini A, Sanson T, Mizzotti C
Crispr
If you've ever watered a tomato plant with municipal water high in salts or gardened near a coastal area, this points to a future where breeders can tune root growth to shrug off salty soil instead of wilting under it.
Researchers found a small gene called Aucsia2 that normally tells tomato roots to branch out. When they used CRISPR to switch it off, the plants grew simpler root systems with fewer side roots, but still produced just as much fruit. Surprisingly, these edited plants also held up much better under salty conditions, apparently because they never over-reacted with the stress hormones that usually cause salt damage in the first place.
Key Findings
CRISPR knockout of Aucsia2 in tomato reduced lateral root formation, producing a more streamlined root system without reducing shoot growth or yield
Under salt stress, cr-Aucsia2 mutants showed less root and shoot damage and a weaker halotropic (salt-avoidance) root response than wild-type plants
Mutants had constitutively altered ethylene-responsive genes and lower baseline abscisic acid and salicylic acid, suggesting a pre-adapted, stress-ready state rather than a reactive one
chevron_right Technical Summary
Scientists deleted a single tiny gene in tomato plants and got roots that grow fewer side branches but handle salty soil far better, without hurting fruit yield.
Abstract Preview
Original paper
Loss of Aucsia2 remodels root architecture and enhances salt stress resilience in tomato.
Aucsia (Auxin cum silencing action) genes are widespread throughout the green plant lineage and encode miniproteins of 40-56 amino acids characterized by a conserved 16-amino acid motif. In tomato,...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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