Radiotracer experiments making use of crude chromoplast preparations [3] and PDS expressed in E. coli [4] exposed the presence of a complex poly-cis pathway that consists of dehydrogenation and isomerization reactions

Carotenoids are yellow-orange pigments with different functions in plants ranging, inter alia, from coloration, by way of photosynthesis to phytohormone source (abscisic acid and strigolactones). The chromophore of cyclic plant…