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Plant and Cell Physiology, 2001, Vol. 42, No. 12 1345-1354
© 2001 Oxford University Press

OARE-1, a Ty1-copia Retrotransposon in Oat Activated by Abiotic and Biotic Stresses

Yosuke Kimura1, Yukio Tosa1,4, Saori Shimada1, Ryohei Sogo1, Motoaki Kusaba2, Tetsuo Sunaga3, Shigeyuki Betsuyaku1, Yukiko Eto1, Hitoshi Nakayashiki1 and Shigeyuki Mayama1

1 Laboratory of Plant Pathology, Faculty of Agriculture, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, 657-8501 Japan 2 Laboratory of Plant Pathology, Faculty of Agriculture, Saga University, 1, Honjo-cho, Saga, 840-8502 Japan 3 Division of Biotechnology, Tochigi Prefectural Agricultural Experiment Station, 1080, Kawaraya-cho, Utsunomiya, 320-0002 Japan

Transcriptionally active Ty1-copia LTR-retrotransposons were found in oat using RT-PCR for amplifying the reverse transcriptase domain. Sequence analysis of the RT-PCR clones suggested that oat LTR-retrotransposons consist of at least seven groups, which were tentatively designated as Oatrt1 to Oatrt7. A full length copy of Oatrt1 was isolated from an oat genomic library, and was designated OARE-1. OARE-1 was 8,665 bp long and a member of the BARE-1 subgroup. The oat genome carried it in multiple copies (at least 10,000 copies / a hexaploid genome). The expression of OARE-1 was intensively induced by wounding, UV light, jasmonic acid and salicylic acid, and its pattern was very similar to that of the PAL (phenylalanin ammonia lyase) gene. Furthermore, OARE-1 was highly activated by infection with an incompatible race of the crown rust fungus, Puccinia coronata. These results suggest that OARE-1 is highly sensitive to various abiotic and biotic stimuli leading to plant defense responses.

4 Corresponding author: E-mail, tosayuki@kobe-u.ac.jp; Fax, +78-803-5866.


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