Discussion
In golden rice, the gene phytoene desaturase (crtl) was obtained from :
Answer: B
The crtI gene came from Erwinia uredovora (printed 'uredovera').
Golden rice makes beta-carotene in the endosperm by adding two genes: phytoene synthase (psy), from daffodil (Narcissus pseudonarcissus) in the original version and from maize in Golden Rice 2, and the bacterial phytoene desaturase crtI from Erwinia uredovora, which carries out several desaturation steps in one.
So Narcissus and Zea mays supplied the phytoene synthase, not crtI, and Oryza sativa is the rice itself, which lacks an active pathway in the endosperm.
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