Fig. 1

The overview features of the B. glabra Choisy. (a) Morphological characters of floral organs in B. glabra plants. The blooming shoots are densely arranged with inflorescences arise as terminal or axillary cymose. The inflorescences show asynchronous flowering, with some differences in timing among individuals. The flower is salver-shaped, with tubular perianths constricted in the middle, its pedicel is attached to the central midrib of bract. Axillary thorns can become hard through lignification during vegetative growth stage, or differentiate into inflorescences during reproductive growth stage. (b) The genome survey results based on the kmer size of 51. (c) and (d) exhibited the Hi-C heatmap of Hap1 and Hap2 respectively. The darker colours indicate that contigs in the region have more interactions with each other. (e and f) exhibited the kmer spectrum analysis performed by KAT, the black region represents the proportion of kmers present in the HiFi reads but missing in the assemblies. Other colours indicate how many times the specific kmer occurred in the assembled genome.