82.シロイヌナズナ切断花茎の組織癒合にはオーキシンとエチレンのシグナリングが必要である(口頭発表)

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In higher plants, when wounding interrupts the original organ or tissue connection, cell de-differentiation and regeneration are induced at the cut position. These cells acquire embryonic potential, and then tissue-reunion occurs to restore physiological connections. Our previous work suggests that leaf gibberellin is required for the tissue-reunion of cortex in the cucumber and tomato cut hypocotyls. We studied molecular mechanisms for tissue reunion in Arabidopsis cut flowering stems. Microarray analysis revealed differential gene expression patterns between cut and non-cut flowering stems, and time-course changes in expression during the reunion process. ACC synthase (ACS) and auxin-responsible IAA was significantly up-regulated at 1d after cutting, and putative ethylene-responsive AP2-type transcription factor shows a similar expression pattern to that of ACS. GUS accumulation was strongly observed at both upper and lower regions of the cut position in the IAA::GUS and ACS::GUS plant. Ethylene-signaling deficient mutant showed lower efficiency in tissue-reunion in the cut stem. mIAA transgenic plants, of which auxin response were suppressed, also showed lower efficiency. These results suggest that ethylene production and auxin accumulation occur after cutting, and that ethylene and auxin signaling pathways have an important role in the regulation of gene expression during tissue-reunion of Arabidopsis cut flowering stems.
植物化学調節学会の論文
2008-10-06

82.シロイヌナズナ切断花茎の組織癒合にはオーキシンとエチレンのシグナリングが必要である(口頭発表)

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