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. 2020 Oct 1;7:163. doi: 10.1038/s41438-020-00383-0

Fig. 7. A proposed model of the involvement of the BR biosynthetic gene SlCYP90B3 in tomato fruit ripening in an ethylene-dependent manner.

Fig. 7

a During tomato fruit ripening, morphological and biochemical changes take place, including gradually elevated BR levels, sugar and carotenoid accumulation, enhanced release of ethylene and flavor volatiles, and reduced firmness. SlCYP90B3 overexpression promotes all aspects of the ripening process. MG, mature green; B, breaker; T, turning; P, pink; R, red. b SlCYP90B3 catalyzes the rate-limiting step from campestanol to cathasterone/6-deoxocathasterone in the BR biosynthetic pathway and increases the level of active BRs. The induced BRs in turn regulate the biosynthesis of ethylene and its downstream signaling to promote fruit ripening. CN campestanol, CTs cathasterone and 6-deoxocathasterone, BRs brassinosteroids, SAM S-adenosyl methionine, ACC 1-aminocyclopropane-1-carboxylic acid, ACS ACC synthase, ACO ACC oxidase.