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Study of the Involvement of Phosphatidic Acid Formation in the Expression of Wound-Responsive Genes in Cotton.

Lipids 2018 September 11
Plants use phospholipase D (PLD, EC 3.1.4.4)/phosphatidic acid (PtdOH) for the transduction of environmental signals including those coming from wounding. Based on our previous findings suggesting that wound-induced PLDα-derived PtdOH can act as a local signaling molecule in cotton (Gossypium hirsutum), we show that wounding immediately increases local NADPH oxidase (NADPHox) and cellulose synthase A (CeSA) gene expression. After developing a novel fluorimetric assay for the investigation of n-butanol inhibitory effect on PLD activity, we show that only NADPHox gene upregulation is reduced when n-butanol is applied prior to wounding. This suggests that NADPHox is a possible downstream target of PLD function, while a different CeSA-involving response system may exist in cotton. Overall, this study provides new knowledge on signal-transduction mechanisms following wounding of cotton leaves.

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