Abstract
The lipoxygenase (LOX) pathway of polyunsaturated fatty acids (PUFAs) metabolism is believed to be involved in the defence of plants against pathogens. It has been shown that LOX is highly induced in cultured tobacco cells treated with elicitors of Phytophthora parasitica var. nicotianae, a fungal pathogen of this plant [1]. This enzyme leads to the formation of a variety of active compounds. Among them, jasmonic acid is an efficient inducer of defense gene expression [2, 3]. Since prior release of PUFAs might be required to initiate the LOX pathway, we have looked for phospholipid alterations and phospholipase activity in elicitor-treated tobacco cells. The obtained data indicate that a fatty acid releasing-phospholipase activity could be one of the first steps of the LOX pathway in elicitor-treated tobacco cells.
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