MAX1 — Sorghum bicolor

Summary

SORBI_3003G269500, designated SbMAX1 (also known as SbCYP711A1), encodes a cytochrome P450 monooxygenase on chromosome 3. The enzyme exhibits multiple oxidoreductase activities, including angelicin synthase, flavonoid 3',5'-hydroxylase, and limonene 6-hydroxylase activities, and is associated with heme and iron binding. SbMAX1 is linked to strigolactone biosynthesis and secondary shoot formation, as well as auxin polar transport, seed germination, and defense response. The gene has been connected to plant height and parasitic weed interactions, and to phenotypes including shoot branching, axillary bud outgrowth, leaf senescence, heat tolerance, bacterial disease resistance, and root system architecture. Related genes in other species are linked to endophytic fungal symbiosis and tiller number.