Photoregulated carotenoid biosynthesis consists of an initiating photo-activation which bestows carotenogenic competence upon photochromogenic microorganisms. Subsequent carotenoid biosynthesis is light independent but requires microbial growth. Experimental systems have been developed for several photochromogenic microorganisms to separate the primary photoact from the following carotenogenic reactions. Investigations with Flavobacterium dehydrogenans have shown that photoactivated carotenoge-nesis is one aspect of a photoresponse which includes RNA-controlled protein biosynthesis, qualitative changes in lipids and fatty acids and a general metabolic shift-down. It is probable that the fundamental photoresponse is a readjustment of the bacterial physiology to allow existence in light and this centres upon a need to biosynthesize carotenoid for photoprotection against photodynamic damage of the cell.

中文翻译：

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非光合微生物中的光调节类胡萝卜素生物合成

光调节的类胡萝卜素生物合成包括启动光活化，其赋予光致色微生物产生类胡萝卜素的能力。随后的类胡萝卜素生物合成不依赖光，但需要微生物生长。已经开发了用于几种光致色原微生物的实验系统，以将初级光作用与以下类胡萝卜素反应分离。对脱氢黄杆菌的研究表明，光活化的胡萝卜素生成是光反应的一个方面，包括 RNA 控制的蛋白质生物合成、脂质和脂肪酸的质量变化以及一般的代谢下降。