Rapid amplification of four retrotransposon families promoted speciation and genome size expansion in the genus Panax.

摘要: Genome duplication and repeat multiplication contribute to genome evolution in plants. Our previous work identified a recent allotetraploidization event five high-copy LTR retrotransposon (LTR-RT) families PgDel, PgTat, PgAthila, PgTork, PgOryco Panax ginseng. Here, using whole-genome sequences, we quantified major repeats species investigated their role evolution. The diploids P. japonicus, vietnamensis, notoginseng the tetraploids ginseng quinquefolius were analyzed alongside relative Aralia elata. These possess 0.8–4.9 Gb haploid genomes. PgTork LTR-RT superfamilies accounted for 39–52% of genomes 17% A. elata genome. PgDel included six subfamily members, each with distinct distribution. In particular, PgDel1 occupied 23–35% much size variation. 22.6% (0.8 Gb 3.6 Gb) 34.5% (1.7 Gb 4.9 Gb) genomes, respectively. findings indicate that may have expanded due rapid amplification over last million years as result environmental adaptation following migration from Asia North America.