54.植物の傷害応答伝達シグナルとしてのJA-Ileの植物内における移動性の検討(口頭発表)

概要

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Determining the mobile signal used by plants to defend against biotic and abiotic stresses has proved elusive, but jasmonic acid (JA) and its derivatives appear to be involved. Using deuterium-labeled analogs, we investigated the systemic transport of JA and jasmonoyl isoleucine (JA-Ile) in response to leaf wounding in tobacco (Nicotiana tabacum) plants. We recovered [2H2-2]JA (JA d2) and ([2H3-12]JA-Ile (JA-Ile d3) in systemic leaves of tobacco after treating wounded leaves with JA d2 or JA-Ile d3. We found that JA-Ile had a greater mobility than JA, despite its lower polarity, and that application of exogenous JA-Ile to wounded leaves led to a higher accumulation of JA and JA-Ile in systemic leaves compared to wounded control plants. We also found that exudates from the stem of tomato (Solanum lycopersicum) plants with damaged leaflets contained JA and JA-Ile in higher levels than in an undamaged plant, and a significant difference in the levels of JA-Ile was observed 30min after wounding. These results suggest that JA-Ile might be transportable compound involved in the resistance to biotic and abiotic stresses in plants.
2010-10-01