Cloning and functional characterization of the maize carotenoid isomerase and Delta b-carotene hydroxylase genes and their regulation during endosperm maturation

In order to gain further insight into the partly-characterized carotenoid biosynthetic pathway in corn (Zea mays L.), we cloned cDNAs encoding the enzymes carotenoid isomerase (CRTISO) and Delta *b-carotene hydroxylase (BCH) using endosperm mRNA isolated from inbred line B73. For both enzymes, two d...

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