One plant gene decides which defenses to afford when sulfur runs low
Guo Q, Gong H, Kleven BJ, Yao J, Wang J
Plant Signaling
Sulfur in your garden soil isn't just a fertilizer nutrient, it's a raw material plants ration to fight off pests and disease, and this gene shows how they make that budgeting decision on the fly.
Plants build chemical defenses against insects and diseases, but some of those defenses are expensive because they need a lot of sulfur, an element that isn't always abundant in soil. Researchers discovered a gene called CDK8 that acts like an accountant: when sulfur is plentiful, it green-lights the pricier defenses, but when sulfur runs short, it switches the plant over to a cheaper defense compound instead. This helps explain how plants juggle staying healthy, fighting off attackers, and growing normally all at once.
Key Findings
CDK8 amplifies jasmonate-triggered immune responses, boosting glucosinolates, camalexin, and sulfur-rich defensin peptides when sulfur is abundant
Under sulfur limitation, CDK8 triggers a transcriptional switch that suppresses defensins and glucosinolates while inducing camalexin, a lower-sulfur-cost defense
CDK8 also restrains plant growth and reduces seed yield when jasmonate signaling is elevated, revealing a growth-defense tradeoff mechanism
chevron_right Technical Summary
Scientists found a gene switch in Arabidopsis plants that decides how to spend limited sulfur when under attack, shifting between building expensive sulfur-rich defenses and cheaper backup ones depending on how much sulfur is available.
Abstract Preview
Original paper
CDK8 coordinates jasmonate-induced immunity with sulfur-responsive defense in Arabidopsis.
Plant immunity draws heavily on carbon-, nitrogen-, and sulfur-based precursors for the deployment of specialized defense compounds. The jasmonate signaling pathway promotes expression of metabolic...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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