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. 2022 Oct 3;11(19):2604. doi: 10.3390/plants11192604

Figure 2.

Figure 2

Strigolactone biosynthesis in a plant cell. Proposed SL biosynthesis pathway. D27, CCD7, and CCD8 are plastid localized enzymes that form CL from all-trans β-carotene. CL is then oxidized by the CYP711A family to yield CLA. GaCYP722C and LjCYP722C are involved in the production of strigol-type canonical SL, 5DS. For non-canonical SLs, MeCLA was shown to be synthesized from CLA in Arabidopsis. It has recently been demonstrated that Arabidopsis, tomato, and sorghum LBOs convert MeCLA into 1-OH-MeCLA and CLA. Moreover, LjLLD, encoding a novel 2OGD, was shown to be involved in the biosynthesis of lotuslactone (non-canonical SL). Enzymes of rice, Arabidopsis, pea, petunia, and other plants are shown in blue, red, green, and orange, respectively. Solid arrows indicate the confirmed pathways, whereas dashed arrows indicate the pathways which are not fully established. LBO (LATERAL BRANCHING OXIDOREDUCTASE) Vu, Vigna unguiculata (cowpea); Sl, Solanum lycopersicum (tomato); Ga, Gossypium arboreum (cotton); Lj, Lotus japonicus; Sb, Sorghum bicolor.