Fig. 8From: Carbon monoxide is involved in melatonin-enhanced drought resistance in tomato seedlings by enhancing chlorophyll synthesis pathwayCO mediates MT-enhanced chlorophyll biosynthesis in tomato seedlings under drought stress. CO is involved in the MT-improved biosynthesis of chlorophyll and heme by increasing content of Proto IX, heme, Mg-Proto IX, Pchlide, Chl a and Chl b and up-regulating expression of SlUROD, SlPPOX, SlFECH, SlMGMT, SlPOR, SlChlS, and SlCAO. CO, carbon monoxide; MT, melatonin; Uro III, uroporphyrinogen III; Proto IX, protoporphyrin IX; Mg-Proto IX, Mg-protoporphyrin IX; Pchlide, potochlorophyllide; Chl a, chlorophyll a; Chl b, chlorophyll bBack to article page