Cloning and characterization of the phytoene desaturase (<Emphasis Type="Italic">pds</Emphasis>) gene — a key enzyme for carotenoids synthesis in <Emphasis Type="Italic">Dunaliella</Emphasis> (Chlorophyta)
(1) Marine Fisheries Research Institute of Shandong Province, Yantai, 264006, P. R. China;(2) Lab of Algae Biotechnology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, P. R. China