Impact of transcriptional, ABA-dependent, and ABA-independent pathways on wounding regulation of RNS1 expression.

Injured plants induce a wide range of genes whose products are thought to help to repair the plant or to defend against opportunistic pathogens that might infect the wounded plant. In Arabidopsis thaliana L., oligogalacturonides (OGAs) and jasmonic acid (JA) are the main regulators of the signaling pathways that control the local and systemic wound response, respectively. a secreted ribonuclease, is induced by wounding in Arabidopsis independent of these two signals, thus indicating that another wound-response signal exists. Here we show that abscisic acid (ABA), which induces wound-responsive genes in other systems, also induces In the absence of ABA signaling, wounding induces only approximately 45% of the endogenous levels of mRNA. However, significant levels of duanyu16681 still accumulate in the absence of ABA signaling. Our results suggest that wound-responsive increases in ABA production may amplify induction of duanyu16681 by a novel ABA-independent pathway. To elucidate this novel pathway, we show here that the wound induction of duanyu16681 is due in part to transcriptional regulation by wounding and ABA. We also show evidence of post-transcriptional regulation which may contribute to the high levels of duanyu16681 transcript accumulation in response to wounding.

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