liigse valgusenergia soojuslikus hajutamises osalevad hapnikku sisaldavad karotinoidid
Oxygen-containing carotenoids that play a role in the nonphotochemical quenching. During light stress, violaxanthin is converted to zeaxanthin. In the dark, the process is vice-versa.
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Fotosüsteemis II paiknevas ksantofüllide tsüklis toimub valguses ensümaatiline violaksantiini muutumine pikemaahelaliseks energiat hajutavaks zeaksantiiniks. Pimedas toimub zeaksantiini muutumine violaksantiiniks.
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