The Draft Genome Assembly of the Critically Endangered Nyssa yunnanensis, a Plant Species with Extremely Small Populations Endemic to Yunnan Province, China

Nyssa yunnanensis is a deciduous tree in family Nayssaceae within the order Cornales. As only 8 individuals in 2 sites recorded in Yunnan province of China, the species was listed as the China’s national grade-I protection species in 1999, and also as one of 120 PSESP(Plant Species with Extremely Small Populations) in Implementation Plan of Rescuing and Conserving China’s Plant Species with extremely Small Populations(PSESP) (2011-2-15). N. yunnanensis was also been evaluated as Critically Endangered in IUCN red list and Threatened Species List of China's Higher Plants. Hence understanding the genomic characteristics of this highly endangered Tertiary relict tree species is essential, especially for developing conservation strategies. Here we sequenced and annotated the genome of N. yunnanensis using 10X genomics linked-reads sequencing data. The de novo assembled genome is 1474Mb in length with a scaffold N50 length of 985.59kb. We identified 823.51Mb of non-redundant sequence as repetitive elements and annotated 39,803 protein-coding genes in the assembly. Our result provided the genomic characteristics of N. yunnanensis, which will provide valuable resources for future genomic and evolutionary studies, especially for conservation biology studies of this extremely threatened tree species.