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Trienoic fatty acids are essential constituents of biomembranes and precursors of jasmonates involved in plant defense responses. Two ω-3 desaturases,  At FAD7 and  At FAD8, synthetize trienoic fatty acids in the plastid. Promoter:GUS and mutagenesis analysis was used to identify  cis -elements controlling  AtFAD7  and  AtFAD8  basal expression and their response to hormones or wounding.  AtFAD7  promoter GUS activity was much higher than that of  AtFAD8  in leaves, with specific  AtFAD7  expression in the flower stamen and pistil and root meristem and vasculature. This specific tissue and organ expression of  AtFAD7  was controlled by different  cis -elements. Thus, promoter deletion and mutagenesis analysis indicated that WRKY proteins might be essential for basal expression of  AtFAD7  in leaves. Two MYB target sequences present in the  AtFAD7  promoter might be responsible for its expression in the flower stamen and stigma of the pistil and in the root meristem, and for the  AtFAD7  wound-specific response. Two MYB target sequences detected in the distal region of the  AtFAD8  gene promoter seemed to negatively control  AtFAD8  expression, particularly in true leaves and flowers, suggesting that MYB transcription factors act as repressors of  AtFAD8  gene basal expression, modulating the different relative abundance of both plastid ω-3 desaturases at the transcriptional level. Our data showed that the two ABA repression sequences detected in the  AtFAD7  promoter were functional, suggesting an ABA-dependent mechanism involved in the different regulation of both ω-3 plastid desaturases. These results reveal the implication of different signaling pathways for the concerted regulation of trienoic fatty acid content in Arabidopsis.

Different Cis-Regulatory Elements Control the Tissue-Specific Contribution of Plastid ω-3 Desaturases to Wounding and Hormone Responses