Chromosome-Level Genome Assembly of the 'Gannanzao' Navel Orange (Citrus sinensis L. Osbeck Gannanzao)

Gannanzao navel orange (<em>Citrus sinensis</em> Osbeck cv. Gannanzao) is a variant of the Newhall navel orange (<em>C. sinensis</em> Osbeck cv. Newhall) that exhibits an earlier maturation, making it commercially valuable. However, the underlying mechanism underneath its early maturation remains unknown. To address this question, we conducted genome sequencing and de novo assembly of navel orange cv. Gannanzao. The assembled genome sequence is 334.57 Mb in length with a GC content of 31.48%. It comprises 318 contigs (N50 = 3.23 Mb) and 187 scaffolds (N50 = 31.86 Mb). The BUSCO test demonstrates 94.6% completeness. The annotation revealed 23,037 gene models, 164.95 Mb of repetitive sequences, and 2,554 ncRNA.