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I'll keep this question straight and simple:

Some succulent plants produce carotene, a red pigment, in response to great heat, turning their leaves red. The dragon blood tree (Dracaena draco) is among the succulent plants. Does it exhibit this behaviour too?

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Looks like they do.

What We Know and What We Do Not Know about Dragon Trees?

Numerous phytochemical studies of resins from the Dracaena species resulted in the isolation and subsequent identification of sterols [135–138], steroidal saponins [110,138–141], lignans [138], and terpenoids [131,135,142–144], flavonoids (recently reviewed by Sun et al. [129], bioflavonoids [145,146], carotenoids [109,138], and aromatic compounds [107,147–151].

Citations are behind a paywall but apparently carotenoids are in the sap.

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