Isolation and Characterization of Genomic Retrotransposon Sequences from Octoploid Strawberry (Fragaria X Ananassa Duch.)

Overview

Journal Plant Cell Rep

Publisher Springer

Date 2007 Nov 21

PMID 18026732

Citations 17

Authors

Yue Ma

Haiyue Sun

Guiling Zhao

Hongyan Dai

Xiuyan Gao

He Li

Zhihong Zhang

Affiliations

Soon will be listed here.

Abstract

Strawberry (Fragaria spp.) is a kind of herbaceous perennial plant that propagates vegetatively. The conserved domains of reverse transcriptase (RT) genes of Ty1-copia and Ty3-gypsy groups of LTR retrotransposons were amplified from the cultivated strawberry (Fragaria x ananassa Duch.). Sequence analysis of clones demonstrated that 5 of 19 Ty1-copia group unique sequences and 2 of 10 Ty3-gypsy unique sequences in F. x ananassa genome possessed either stop codon or frameshift. Ty1-copia group sequences are highly heterogeneous (divergence ranged from 1 to 69.8%), but the Ty3-gypsy group sequences are less (divergence ranged from 1 to 10%). Southern dot blot hybridization result suggested that both of the LTR retrotransposons are present in the genome of cultivated strawberry with high copy number (Ty1-copia group 2,875 Ty3-gypsy group 348). RT-PCR amplification from total RNA, which was extracted from leaves of micropropagated strawberry plants, did not yield either of the RT fragments. This is the first report on the presence of RT sequences of Ty1-copia and Ty3-gypsy group retrotransposons in F. x ananassa genome.

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