Tomato gene found that keeps leaves green in darkness
Liu Z, Huang Y, Qiao Y, Wu X, Chen B
Crispr
If you've ever wondered why some houseplants yellow fast in low light while others hang on, this tomato research points to a specific genetic switch controlling how quickly leaves give up and die when shaded.
Researchers discovered a gene in tomato plants named SlNOA1 that helps leaves resist aging and yellowing when kept in the dark. When they deleted this gene, the plants' leaves turned pale, lost their green pigment, and aged much faster than normal. It turns out this gene is controlled by a tug-of-war between another gene that promotes aging and the plant's stress hormone ABA, giving scientists a clearer picture of how plants decide when to let a leaf go.
Key Findings
SlNOA1 is a chloroplast-localized GTP-binding protein that acts as a negative regulator of dark-induced leaf senescence in tomato
CRISPR-Cas9 knockout of SlNOA1 (slnoa1 mutants) caused a pale-green phenotype, reduced chlorophyll content, and accelerated senescence
SlNAP2 binds the SlNOA1 promoter to suppress it, while the ABA receptor SlPYL4 interacts with SlNAP2 to attenuate this suppression, and ABA restores/enhances the inhibitory effect, forming a dynamic negative feedback loop
chevron_right Technical Summary
Scientists found a gene in tomato plants, called SlNOA1, that acts like a brake on leaf aging, especially in the dark. When they knocked it out, leaves turned pale and died faster, revealing a hidden control switch that could help breeders keep crops greener longer.
Abstract Preview
Original paper
Nitric oxide-associated protein 1-like (SlNOA1) suppresses dark-induced leaf senescence in tomato, a process dynamically modulated by SlNAP2 and the ABA-PYLs pathway.
Leaf senescence is a critical physiological process in plant growth and development, significantly impacting crop yield and quality. While the regulatory mechanisms of senescence involve multiple m...
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