Azelaic and hexanoic acids‐inducing resistance in soybean against <i>Phakopsora pachyrhizi</i> infection

Rodrigues, Flávia Caroline Torres; Silveira, Patrícia Ricardino; Cacique, Isaias Severino; Oliveira, Lillian Matias de; Rodrigues, Fabrício Á.

doi:10.1111/ppa.13731

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Monopotassium phosphite combined with free amino acids was tested as an IR stimulus and showed to reduce SBR severity associated with less lipid peroxidation and reduced fungal colonization on leaflet tissues, attributed to the increased production of phenolics and lignin, stronger expression of host defence genes and preservation of the photosynthetic apparatus (Picanço et al ., 2022 ). Azelaic acid (AzA) and hexanoic acid (HxA) were recently shown to effectively inhibit P. pachyrhizi urediniospore germination and reduce SBR severity in soybean (Rodrigues et al ., 2023 ). Since IR results from a host response, the efficacy of these compounds is limited by the genetic potential of the plant genotype.…”

Section: Approaches For Improving Sbr Resistance I...mentioning

confidence: 99%

Soybean‐Phakopsora pachyrhizi interactions: towards the development of next‐generation disease‐resistant plants

Chicowski,

Bredow,

Utiyama

et al. 2023

Plant Biotechnology Journal

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SummarySoybean rust (SBR), caused by the obligate biotrophic fungus Phakopsora pachyrhizi, is a devastating foliar disease threatening soybean production. To date, no commercial cultivars conferring durable resistance to SBR are available. The development of long‐lasting SBR resistance has been hindered by the lack of understanding of this complex pathosystem, encompassing challenges posed by intricate genetic structures in both the host and pathogen, leading to a gap in the knowledge of gene‐for‐gene interactions between soybean and P. pachyrhizi. In this review, we focus on recent advancements and emerging technologies that can be used to improve our understanding of the P. pachyrhizi‐soybean molecular interactions. We further explore approaches used to combat SBR, including conventional breeding, transgenic approaches and RNA interference, and how advances in our understanding of plant immune networks, the availability of new molecular tools, and the recent sequencing of the P. pachyrhizi genome could be used to aid in the development of better genetic resistance against SBR. Lastly, we discuss the research gaps of this pathosystem and how new technologies can be used to shed light on these questions and to develop durable next‐generation SBR‐resistant soybean plants.

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Section: Approaches For Improving Sbr Resistance I...mentioning

confidence: 99%

Soybean‐Phakopsora pachyrhizi interactions: towards the development of next‐generation disease‐resistant plants

Chicowski,

Bredow,

Utiyama

et al. 2023

Plant Biotechnology Journal

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Increasing Soybean Resistance Against Rust Using a Product Containing Calcium and Nitrogen Complexed With Polyphenols

Fontes,

Silva,

Silva

et al. 2024

Journal of Phytopathology

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Among soybean diseases, rust, caused by Phakopsora pachyrhizi, stands out as one of the most destructive. Resistance inducers may be a great alternative to reduce the yield losses caused by this disease from the perspective of more sustainable agriculture. In this study, soybean plants were sprayed with water (control) or with Cautha [referred to as induced resistance (IR) stimulus after that] and inoculated or non‐inoculated with P. pachyrhizi. The germination of urediniospores was significantly reduced by 22%, 26%, 19%, and 25% for the IR stimulus rates of 2.5, 5, 10, and 20 mL/L, respectively. Rust severity was significantly reduced by 27%, 19%, 23%, 25%, and 41% at 7, 9, 11, 13, and 15 days after inoculation, respectively, and the area under the disease progress curve significantly decreased by 27% for IR stimulus‐sprayed plants compared to water‐sprayed plants. For infected plants, foliar concentrations of Ca, N, chlorophyll a + b, and carotenoids were higher for IR‐stimulus sprayed plants than for water‐sprayed plants. Lower concentrations of malondialdehyde (less cellular damage) and reactive oxygen species (hydrogen peroxide and superoxide anion radical) along with great activities of antioxidative enzymes (ascorbate peroxidase, catalase, glutathione reductase, and superoxide dismutase) helped to reduce rust symptoms for IR‐stimulus sprayed plants. On top of that, these plants also showed greater foliar concentrations of total soluble phenols and lignin as well as increased activities of defence‐related enzymes (chitinase, β‐1,3‐glucanase, phenylalanine ammonia‐lyase, peroxidase, polyphenoloxidase, and lipoxygenase). These results strongly support the potential of using this IR stimulus to increase soybean resistance against infection by P. pachyrhizi and, at the same time, to act directly against the germination of the urediniospores.

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Resistance in Soybean Against Infection by Phakopsora pachyrhizi Is Induced by a Phosphite of Nickel and Potassium

Fontes,

Silva,

Picanço

et al. 2024

Plants

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Soybean (Glycine max (L.) Merr.) is one of the most profitable crops among the legumes grown worldwide. The occurrence of rust epidemics, caused by Phakopsora pachyrhizi, has greatly contributed to yield losses and an abusive use of fungicides. Within this context, this study investigated the potential of using a phosphite of nickel (Ni) and potassium (K) [referred to as induced resistance (IR) stimulus] to induce soybean resistance against infection by P. pachyrhizi. Plants were sprayed with water (control) or with IR stimulus and non-inoculated or inoculated with P. pachyrhizi. The germination of urediniospores was greatly reduced in vitro by 99% using IR stimulus rates ranging from 2 to 15 mL/L. Rust severity was significantly reduced from 68 to 78% from 7 to 15 days after inoculation (dai). The area under the disease progress curve significantly decreased by 74% for IR stimulus-sprayed plants compared to water-sprayed plants. For inoculated plants, foliar concentrations of K and Ni were significantly higher for IR stimulus treatment than for the control treatment. Infected and IR stimulus-sprayed plants had their photosynthetic apparatus (a great pool of photosynthetic pigments, and lower values for some chlorophyll a fluorescence parameters) preserved, associated with less cellular damage (lower concentrations of malondialdehyde, hydrogen peroxide, and anion superoxide) and a greater production of phenolics and lignin than plants from the control treatment. In response to infection by P. pachyrhizi, defense-related genes (PAL2.1, PAL3.1, CHIB1, LOX7, PR-1A, PR10, ICS1, ICS2, JAR, ETR1, ACS, ACO, and OPR3) were up-regulated from 7 to 15 dai for IR stimulus-sprayed plants in contrast to plants from the control treatment. Collectively, these findings provide a global picture of the enhanced capacity of IR stimulus-sprayed plants to efficiently cope with fungal infection at both biochemical and physiological levels. The direct effect of this IR stimulus against urediniospores’ germination over the leaf surface needs to be considered with the aim of reducing rust severity.

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Azelaic and hexanoic acids‐inducing resistance in soybean against Phakopsora pachyrhizi infection

Cited by 3 publications

References 42 publications

Soybean‐Phakopsora pachyrhizi interactions: towards the development of next‐generation disease‐resistant plants

Soybean‐Phakopsora pachyrhizi interactions: towards the development of next‐generation disease‐resistant plants

Increasing Soybean Resistance Against Rust Using a Product Containing Calcium and Nitrogen Complexed With Polyphenols

Resistance in Soybean Against Infection by Phakopsora pachyrhizi Is Induced by a Phosphite of Nickel and Potassium

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