ios yn thesis ▁path ways , ▁and ▁it ▁has ▁been ▁supported ▁by ▁different ▁studies . ▁The ▁A BA ▁b ios yn thesis ▁re lies ▁in ▁a ▁set ▁of ▁en zym es , ▁called ▁ 9 - cis - ep ox y car oten oid ▁dy ox y gen ase ▁( NC ED ). ▁But , ▁mut ants ▁plants ▁that ▁were ▁defect ive ▁in ▁the ▁production ▁of ▁the ▁NC ED ▁en zym es , ▁not ▁just ▁presented ▁low ▁levels ▁of ▁A BA , ▁rather ▁they ▁also ▁present ▁low ▁levels ▁of ▁str ig ol act ones , ▁specifically ▁in ▁the ▁roots ▁extract s ▁where ▁this ▁h orm one ▁is ▁mostly ▁synth es ized , ▁this ▁finding ▁provided ▁the ▁basis ▁for ▁the ▁existence ▁of ▁a ▁common ▁en zym atic ▁mach in ery , ▁Other ▁experiments ▁that ▁consist ▁in ▁blocking ▁the ▁NC ED ▁en zym es ▁and ▁using ▁mut ants ▁unable ▁to ▁detect ▁A BA ▁changes , ▁were ▁used ▁to ▁support ▁this ▁theory . ▁So ▁far ▁there ▁is ▁a ▁clear ▁correlation ▁of ▁both ▁synth esis ▁that ▁is ▁related ▁to ▁the ▁used ▁of ▁NC ED ▁en zym es ▁in ▁both ▁b ios yn thesis , ▁but ▁the ▁exact ▁mechanism ▁in ▁which ▁they ▁are ▁connected ▁remains ▁unclear . ▁ ▁M ole cular ▁per ception ▁ ▁In ▁plants , ▁str ig ol act ones ▁are ▁perce ived ▁by ▁the ▁dual ▁re ceptor / h yd rol ase ▁protein ▁D W AR F 1 4 ▁( D 1 4 ), ▁a ▁member ▁of ▁the ▁α / β ▁hyd rol ase ▁super