95. バイオフォトンは植物のストレス応答におけるシグナルクロストークを反映する(口頭発表,植物化学調節学会第46回大会)

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Plant cells generate high-level of Biophotons during elicitor response. We previously found that plant activators and defense-related plant hormones (eg. PBZ, BTH, SA, JA) prime rice cells for enhanced generation of chitin elicitor responsive Biophotons. The chitin elicitor responsive Biophotons were generated through phospholipid signaling in close association with production of H_2O_2, a signal molecule in stress responses. Here we report that sublethal treatment of rice cells with thermal and osmotic stresses potentiate chitin elicitor responsive Biophotons. Sublethal abiotic stress treatment primes plant cells to survive in lethal stresses (so-called "acclimation"). We also found that abscisic acid, a plant stress hormone, also showed potentiation activity of elicitor-responsive Biophotons. These results indicate that not only biotic stress resistance, but also abiotic stress resistance in plant could be reflected on the potentiation of elicitor-responsive Biophotons. It is estimated that signal crosstalk between biotic and abiotic stress response underlies this phenomenon. By applying this phenomenon on the screening of compounds library, we have found some compounds which protect plants from heat stress disorder. This work was supported by Adaptable and Seamless Technology Transfer Program through target-driven R&D, JST.
2011-10-03