Geneome analysis of haptopytes marine plants

Abstract

Haptophytes is a important primary producer and is a distinct photosynthetic lineage among diverse algal evolution via the serial endosymbiosis. Emiliania, Isochrysis, Pavlova and Phaeocystis are well-known for important primary producers in open ocean and feedstocks of marine fish and shellfish aquaculture. Despite economical, ecological and evolutionary importances of the lineage, genome scale data of haptophytes is very limited. The Emiliania huxleyi CCMP1516 (Isochrysidales) is an only species with comprehensive genome, i.e., a total 167 Mb (No. ctg = 7,795, N50 = 29,715 bp, 65.7% GC content) with 38,554 proteins and 38,549 genes. Genome of Chrysochromulina sp. CCMP291 (Prymnesiales 59.1 Mb, 63.4% GC, 16,765 proteins) is a draft level. In present study, we planned to assemble three de novo haptophytes genomes including Chrysotila carteri (= Pleurochrysis carterae, Coccolithales), Diacronema lutheri (= Pavlova lutheri, Pavolovales), and Isochrysis galbana (Isochrysidales). All culture strains are available from the Library of Marine Samples at KIOST (http://lims.kiost.ac). Isochrysis galbana is first target species because of closely related sister taxa of Emiliania huxleyi sofar. New haptophytes genome data may will provide new insights for the evolution and functional ecology of eukaryotes, and useful information for related marine industrial application.