Interaction Between Resistance Inducer and Micronutrients on the Control of Root-Lesion Nematode and the Development of Soybean Plants

Abstract

Root lesion nematodes limit the productivity of several crops of economic importance, requiring alternatives for their management. Resistance inducers activate enzymes involved in defense mechanisms and micronutrients can influence this process by acting as enzymatic cofactors. Thus, the objective of this study was to evaluate the effect of foliar application of a commercial organomineral fertilizer and its association or not with zinc (Zn) and manganese (Mn) micronutrients on the Pratylenchus brachyurus suppression and soybean plant development under greenhouse conditions. Shoots of soybean were treated 10 days after germination and inoculated with 5000 nematodes/plant five days after the treatments, using untreated plants as controls. Treatments consisted of a commercial product based on phosphorylated mannanoligosaccharide derived from the cell wall of Saccharomyces cerevisiae (here coded as MOS), Zn, Mn, MOS+Zn, MOS+Mn or MOS+Zn+Mn. At sixty days after establishment of treatments, the plants were collected and evaluated for vegetative analysis, nematological analysis and nutrient contents. The work was repeated at different times: experiment 1 from November 2016 to January 2017 and experiment 2 from October to November 2017. All treatments were efficient in controlling P. brachyurus in at least one of the evaluated nematological parameters, compared to the control. However, only the plant spraying with MOS+Zn results in significative reduction of the total number of nematodes and the number of P. brachyurus nematodes per gram of soybean root in both experiments. In addition, spraying of plants with Mn increased shoot dry weight and all treatments resulted in higher concentrations of copper, Zn and Mn in soybeans leaves compared to control.

Host status of weeds for Pratylenchus coffeae

“…Pathogenic variability in P. coffeae has been previously reported (Mizukubo et al, 2003). The higher number of both nematode's populations and RF, verified in the second trial for R. communis and M. lathyroides corroborating Conduta et al (2020), who observed a negative correlation between the number of P. brachyurus per gram of soybean (Glycine max (L.) Merril) root and fresh root weight.…”

Application of Ascophyllum nodosum extract and its nutrient components for the management of Meloidogyne javanica in soybean

“…Manganese, which reduced M. javanica populations in both trials, was previously reported as an effective compound for the control of P. brachyurus, whether isolated or combined with a MOS-based product (Conduta et al, 2020). Possibly, the suppressive action of Mn on nematodes is related to the compound's capacity of activating enzymes responsible for the production of secondary metabolites, such as lignin and flavonoids (Barker and Pilbeam, 2007).…”

“…The referred authors hypothesized that micronutrients such as Zn can improve the efficiency of resistance inducers and that balanced fertilization can be used as part of an integrated management strategy for the control of M. javanica in soybean. Isolated Zn was effective in reducing Pratylenchus brachyurus in soybean, but the best result was obtained by combination with phosphorylated mannanoligosaccharide derived from the cell wall of Saccharomyces cerevisiae (MOS) (Conduta et al, 2020).…”

Marcha de absorção de nutrientes e crescimento do meloeiro ‘Gladial®’ fertirrigado

“…In addition, it also plays a role in nitrogen metabolism and cyclic compounds, and acts as a precursor of amino acids, hormones, phenols, and lignin (Conducta et al, 2020).…”