Involved in strigolactones biosynthesis by catalyzing the isomerization of the C9-C10 double bond in all-trans-beta-carotene leading to 9-cis-beta-carotene and providing the substrate for CCD7 (PubMed:26503135). Strigolactones are hormones that inhibit tillering and shoot branching through the MAX-dependent pathway, contribute to the regulation of shoot architectural response to phosphate-limiting conditions and function as rhizosphere signals that stimulate hyphal branching of arbuscular mycorrhizal fungi and trigger seed germination of root parasitic weeds (PubMed:26503135). all-trans-beta-carotene = 9-cis-beta-carotene Highly expressed in roots (PubMed:22039214). Expressed at low levels in leaves and stems (PubMed:22039214). Induced by phosphate deprivation (PubMed:22039214, PubMed:26503135). Induced by Rhizobium lipo-chitooligosaccharide elicitors (PubMed:26503135). Roots of plants silencing D27 exhibit a strong reduction in strigolactone synthesis. Extended N-terminus.