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Plant Physiol, December 2002, Vol. 130, pp. 1807-1814
An Endoplasmic Reticulum-Derived Structure That Is Induced under
Stress Conditions in Arabidopsis1
Ryo
Matsushima,
Yasuko
Hayashi,
Maki
Kondo,
Tomoo
Shimada,
Mikio
Nishimura, and
Ikuko
Hara-Nishimura*
Department of Botany, Graduate School of Science, Kyoto University,
Kyoto 606-8502 Japan (R.M., T.S., I.H.-N.); Department of
Environmental Science, Faculty of Science, Niigata University,
Ikarashi, Niigata 950-2181, Japan (Y.H.); and Department of Cell
Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan
(M.K., M.N.)
The endoplasmic reticulum (ER) body is a characteristic structure
derived from ER and is referred to as a proteinase-sorting system that
assists the plant cell under various stress conditions. Fluorescent ER
bodies were observed in transgenic plants of Arabidopsis expressing
green fluorescent protein fused with an ER retention signal. ER bodies
were widely distributed in the epidermal cells of whole seedlings. In
contrast, rosette leaves had no ER bodies. We found that wound stress
induced the formation of many ER bodies in rosette leaves. ER bodies
were also induced by treatment with methyl jasmonate (MeJA), a plant
hormone involved in the defense against wounding and chewing by
insects. The induction of ER bodies was suppressed by ethylene. An
electron microscopic analysis showed that typical ER bodies were
induced in the non-transgenic rosette leaves treated with MeJA. An
experiment using coi1 and etr1-4 mutant
plants showed that the induction of ER bodies was strictly coupled with
the signal transduction of MeJA and ethylene. These results suggested
that the formation of ER bodies is a novel and unique type of
endomembrane system in the response of plant cells to environmental
stresses. It is possible that the biological function of ER bodies is
related to defense systems in higher plants.
1
This work was supported by the Ministry of
Education, Culture, Sports, Science and Technology of Japan
(Grants-in-Aid for Scientific Research nos. 10182102, 12138205, and
12304049) and by the Japan Society for the Promotion of Science
(postdoctoral fellowship no. 14001468 to R.M.).
*
Corresponding author; e-mail ihnishi{at}gr.bot.kyoto-u.ac.jp; fax
81-75-753-4142.
© 2002 American Society of Plant Biologists
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