One gene switch decides if tobacco fights disease or grows faster
Dwivedi S, Singh D, Gupta S, Rai A, Singh N
Crispr
Any gardener who has watched a stressed plant either toughen up or put out a growth spurt is seeing this same tradeoff play out, and this gene could become a dial breeders turn to build tougher food and ornamental crops without sacrificing yield.
Plants face a constant choice: spend energy growing bigger, or spend energy making chemicals that fend off pests, disease, and stress. Researchers found a single gene called HY5 acts like a master switch for that choice in tobacco plants. Turn the gene up and the plant makes more defensive chemicals and resists a fungal disease and salty soil better; turn it off and the plant hoards nutrients for growth but becomes more vulnerable.
Key Findings
HY5-overexpressing tobacco plants showed increased Calvin cycle, TCA cycle, flavonoid biosynthesis, and nicotine metabolism gene expression, along with higher phenolic and alkaloid accumulation
CRISPR/Cas9 HY5 knockout plants accumulated more amino acids, lipids, and organic acids, favoring growth over defense
HY5-driven metabolic reprogramming improved resistance to the fungal pathogen Alternaria solani and increased tolerance to salt stress
chevron_right Technical Summary
Scientists engineered tobacco plants to have more or less of a single gene switch called HY5, and found it controls a tradeoff: plants with more HY5 pump out defensive chemicals and resist disease and salt stress, while plants without it grow faster but stay vulnerable.
Abstract Preview
Original paper
Multi-Omics Dissection Reveals the Central Regulator NtHY5 Rewires Primary and Secondary Metabolism to Strengthen Biotic and Abiotic Stress Defences in Nicotiana Tabacum.
ELONGATED HYPOCOTYL5 (HY5), a bZIP transcription factor, is a central regulator of light signalling and secondary metabolism, yet its role in coordinating primary metabolism with plant stress respo...
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