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Does anybody know what is the molecule responsible of the yellow color at the edges of this plant? I noticed also that the new forming yellow part at the begging stage is soft green until it is exposed to light. After the exposition to sun light it change from soft green to yellow(like that of the image bellow). Does anybody have any explanation?

enter image description here

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    $\begingroup$ Xanthophylls, I would guess. These are leaves and all leaves do contain Xanthophylls but the green colour due to chlorophyll dominates. These parts of leaves do not produce chlorophyll. $\endgroup$ – WYSIWYG Jul 3 '16 at 19:11
  • $\begingroup$ I think that your explanation is good. But I do not know why this type of evolutionary adaptation...If there is no chlorophyll but only Xanthophylls all the yellow parts are useless in therm of photosynthesis, I guess. $\endgroup$ – blu potatos Jul 4 '16 at 15:17
  • $\begingroup$ Yes. These parts are non-photosynthetic. $\endgroup$ – WYSIWYG Jul 4 '16 at 15:24

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