β-cyclocitral elicits rapid signaling distinct from the excess-light response in Arabidopsis
{beta}-Cyclocitral ({beta}-cc), a {beta}-carotene oxidation product, has been proposed as an early retrograde signal that primes protection against photooxidative stress. Its temporal relationship with photosynthetic acclimation, however, remains unresolved. Exogenous {beta}-cc elicited cytosolic calcium changes within minutes and induced the {beta}-cc-responsive pAER::LUC detoxification reporter…
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