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            <idno type="halRefHtml">&lt;i&gt;Molecules&lt;/i&gt;, 2017, Structure, Chemical Analysis, Biosynthesis, Metabolism, Molecular Engineering and Biological Functions of Phytoalexins, 22 (6), pp.1017. &lt;a target="_blank" href="https://dx.doi.org/10.3390/molecules22061017"&gt;&amp;#x27E8;10.3390/molecules22061017&amp;#x27E9;&lt;/a&gt;</idno>
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                <term xml:lang="en">Aphanomyces euteiches</term>
                <term xml:lang="en">phytoalexins</term>
                <term xml:lang="en">pisatins</term>
                <term xml:lang="en">defensins</term>
                <term xml:lang="en">pea defense pathways</term>
                <term xml:lang="en">gene expression</term>
                <term xml:lang="en">real-time qPCR</term>
                <term xml:lang="en">oligogalacturonides</term>
                <term xml:lang="en">pea root rot</term>
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              <p>Oligogalacturonides (OGs) are known for their powerful ability to stimulate the plant immune system but little is known about their mode of action in pea (Pisum sativum). In the present study, we investigated the elicitor activity of two fractions of OGs, with polymerization degrees (DPs) of 2-25, in pea against Aphanomyces euteiches. One fraction was nonacetylated (OGs-Ac) whereas the second one was 30% acetylated (OGs + Ac). OGs were applied by injecting the upper two rachises of the plants at three-and/or four-weeks-old. Five-week-old roots were inoculated with 10 5 zoospores of A. euteiches. The root infection level was determined at 7, 10 and 14 days after inoculation using the quantitative real-time polymerase chain reaction (qPCR). Results showed significant root infection reductions namely 58, 45 and 48% in the plants treated with 80 µg OGs + Ac and 59, 56 and 65% with 200 µg of OGs-Ac. Gene expression results showed the upregulation of genes involved in the antifungal defensins, lignans and the phytoalexin pisatin pathways and a priming effect in the basal defense, SA and ROS gene markers as a response to OGs. The reduction of the efficient dose in OGs + Ac is suggesting that acetylation is necessary for some specific responses. Our work provides the first evidence for the potential of OGs in the defense induction in pea against Aphanomyces root rot.</p>
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