Chromosome-level genome assembly of bunching onion illuminates genome evolution and flavor formation in Allium crops.

ABSTRACT: The Allium genus is cultivated globally as vegetables, condiments, or medicinal plants and is characterized by large genomes and strong pungency. However, the genome evolution and genomic basis underlying their unique flavor formation remain poorly understood. Herein, we report an 11.27-Gb chromosome-scale genome assembly for bunching onion (A. fistulosum). The uneven bursts of long-terminal repeats contribute to diversity in genome constituents, and dispersed duplication events largely account for gene expansion in Allium genomes. The extensive duplication and differentiation of alliinase and lachrymatory factor synthase manifest as important evolutionary events during flavor formation in Allium crops. Furthermore, differential selective preference for flavor-related genes likely lead to

SUBMITTER: Liao N 

PROVIDER: S-EPMC9637129 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature