SLs are plant hormones derived from plant carotenoids via a pathway involving the Carotenoid Cleavage Dioxygenase 8 ( CCD8). The parasite seeds have strict requirements for germination, involving preconditioning and exposure to specific chemicals strigolactones exuded by the host roots. Broomrapes ( Phelipanche aegyptiaca and Orobanche spp.) are obligate plant parasites that cause extreme damage to crop plants.
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