Downy mildew is a serious disease in organic viticulture as only copper is allowed for its control. Despite this already great difficulty the European Community, and is probably soon going to decrease the allowed quantity to 3 kg ha−1 year−1. Thus, an improvement in copper efficiency, for example enhancing plant response to the disease, is urgently needed. Two days after infection by Plasmopara viticola, resistants produce a peak of methyl-jasmonate higher than the sensitive grapevines. Jasmonate production could be triggered in plants applying Trichoderma or silicon. In this frame Trichoderma, silicon or their combination were tested on potted vines to evaluate the ability of treatments to induce, far from the time of application, plant response such as production of methyl-jasmonate and reduction of the leaf symptoms. The study was carried out analyzing the expression of 13-lipooxygenases LOXA and LOXO, the 9-LOX and the coronatine insensitive protein 1 (COI1) as genes involved in the synthesis of the jasmonic acid and in the plant response to this hormone. The LOXO activation precede or is contemporary to methyl-jasmonate peak and is probably involved in its synthesis, while the activation of LOXA follows the peak, as a responsive gene. Trichoderma activate 9-LOX response while silicon activates the COI1. Since the two compounds activate different pathways, they may integrate each to other. The higher effect observed for the combination against artificial infection seems to confirm this hypothesis.
Osti, F., Ratti, C., Di Marco, S. (2015). LONG TERM EFFECT OF TRICHODERMA AND SILICON ON METHYL JASMONATE PRODUCTION IN LEAF OF POTTED GAPEVINES INOCULATED WITH PLASMOPARA VITICOLA [10.4454/JPP.V97I4SUP.006].
LONG TERM EFFECT OF TRICHODERMA AND SILICON ON METHYL JASMONATE PRODUCTION IN LEAF OF POTTED GAPEVINES INOCULATED WITH PLASMOPARA VITICOLA
RATTI, CLAUDIO;
2015
Abstract
Downy mildew is a serious disease in organic viticulture as only copper is allowed for its control. Despite this already great difficulty the European Community, and is probably soon going to decrease the allowed quantity to 3 kg ha−1 year−1. Thus, an improvement in copper efficiency, for example enhancing plant response to the disease, is urgently needed. Two days after infection by Plasmopara viticola, resistants produce a peak of methyl-jasmonate higher than the sensitive grapevines. Jasmonate production could be triggered in plants applying Trichoderma or silicon. In this frame Trichoderma, silicon or their combination were tested on potted vines to evaluate the ability of treatments to induce, far from the time of application, plant response such as production of methyl-jasmonate and reduction of the leaf symptoms. The study was carried out analyzing the expression of 13-lipooxygenases LOXA and LOXO, the 9-LOX and the coronatine insensitive protein 1 (COI1) as genes involved in the synthesis of the jasmonic acid and in the plant response to this hormone. The LOXO activation precede or is contemporary to methyl-jasmonate peak and is probably involved in its synthesis, while the activation of LOXA follows the peak, as a responsive gene. Trichoderma activate 9-LOX response while silicon activates the COI1. Since the two compounds activate different pathways, they may integrate each to other. The higher effect observed for the combination against artificial infection seems to confirm this hypothesis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
