Soybean resistance to Phakopsora pachyrhizi infection is barely potentiated by boron

Picanço, Bárbara Bezerra Menezes; Ferreira, S. E. S.; Fontes, Belchor; Oliveira, Lillian Matias de; Silva, Bruno Nascimento; Einhardt, Andersom Milech; Rodrigues, Fabrício Á.

doi:10.1016/j.pmpp.2021.101668

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…Attempts to alleviate the stress imposed by P. pachyrhizi infection on photosynthesis of soybean plants (e.g. the spray of ASM, JA, or phosphite mixed with free amino acids and enhanced plant nutrition with boron, nickel and silicon) have been reported (Cruz et al, 2014; Einhardt et al, 2020; Paula et al, 2021; Picanço et al, 2021, 2022; Rios et al, 2018) and the use of HxA and AzA seems to fit well in this context considering the physiological findings obtained in the present study.…”

Section: Discussionmentioning

confidence: 99%

Soybean plants sprayed with azelaic and hexanoic acids and infected by Phakopsora pachyrhizi display better photosynthetic performance and a robust antioxidative metabolism

Rodrigues

Silveira

Cacique

et al. 2023

Journal of Phytopathology

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This study investigated the potential of azelaic acid (AzA) and hexanoic acid (HxA) to reduce rust development, caused by Phakopsora pachyrhizi, on soybean and the physiological and biochemical changes involved. A 4 × 2 factorial experiment was arranged in a completely randomized design with four replications. The factors studied were as follows: plants sprayed with water (control), acibenzolar‐S‐methyl (ASM; 0.5 g/L) (a well‐recognized resistance inducer), AzA (1 mM) or HxA (20 mM) that were non‐inoculated or inoculated with P. pachyrhizi. Area under rust progress curve significantly decreased by 97%, 95% and 95% for ASM, HxA and AzA treatments, respectively, compared with the control treatment. Infected and AzA and HxA‐sprayed plants showed less impairment on photosynthesis (moderate changes in the values of chlorophyll a fluorescence parameters linked to great concentrations of total chlorophyll a + b and carotenoids) in contrast to infected and water‐sprayed plants. A more robust antioxidative metabolism (great activities of superoxide dismutase, ascorbate peroxidase, catalase, peroxidase and glutathione reductase) on infected and AzA and HxA‐sprayed plants helped to reduce hydrogen peroxide and anion superoxide radical depositions in leaf tissues and their concentrations. Collectively, the physiological and biochemical responses obtained for infected and AzA and HxA‐sprayed plants were comparable with that obtained with ASM. Based on these findings, it is plausible to consider the potential of using AzA and HxA for rust management in soybean toward sustainable agriculture.

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Section: Discussionmentioning

confidence: 99%

Soybean plants sprayed with azelaic and hexanoic acids and infected by Phakopsora pachyrhizi display better photosynthetic performance and a robust antioxidative metabolism

Rodrigues

Silveira

Cacique

et al. 2023

Journal of Phytopathology

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“…Leaves from non‐inoculated plants were sampled at these evaluation times to serve as the control treatment. The concentrations of Chl a , Chl b , and carotenoids were determined in four discs (1 cm 2 each) obtained from the third and fourth leaves used for imaging and quantifying Chl a fluorescence parameters at 48 and 96 hai according to Picanço et al (2021). A 4 × 2 factorial experiment was arranged in a completely randomized design with five replications per sampling time.…”

Section: Methodsmentioning

confidence: 99%

Dual effect of picolinic acid in the photosynthetic performance of rice plants infected by Bipolaris oryzae

Hawerroth

Silva

Oliveira

et al. 2023

Journal of Phytopathology

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Brown spot, caused by Bipolaris oryzae, is one of the most important diseases of rice. The non‐host toxin α‐picolinic acid (PA) has great potential to be used to enhance plant resistance against pathogen infection. The present study investigated the effect of spraying PA [0 (control), 1, 3, and 5 mg/mL] on the photosynthetic performance of rice plants (cultivar Metica‐1) infected or not with B. oryzae. Moreover, whether the PA treatment, especially at the highest concentration, could affect brown spot development was also evaluated. The chlorophyll a fluorescence parameters such as variable‐to‐maximum chlorophyll a fluorescence ratio (Fv/Fm), photochemical yield [Y(II)], yield for dissipation by down‐regulation [Y(NPQ)], the yield for non‐regulated dissipation [Y(NO)], and electron transport rate (ETR) as well as the concentration of photosynthetic pigments were determined. Based on the in vitro assay, PA inhibited mycelial growth of B. oryzae in a dose‐dependent manner and conidial germ tube length only decreased at 5 mg PA/mL. Conidia germination was not affected by the PA treatment. Necrotic lesions caused by PA were observed on leaves of non‐inoculated plants at 3 and 5 mg PA/mL. Symptoms of the brown spot were reduced on plants sprayed with 1 and 3 mg PA/mL compared to the control treatment. Brown spot lesions and those originating from PA toxicity overlapped for inoculated plants sprayed with 3 and 5 mg PA/mL. The photochemical performance of non‐inoculated plants was hampered by treatments with 3 and 5 mg PA/mL. Greater concentration of photosynthetic pigments and less impairment on the photosynthetic performance of inoculated plants sprayed with 1 mg PA/mL were noticed based on the values of Fv/Fm, Y(II), Y(NPQ), Y(NO), and ETR compared to inoculated plants non‐sprayed with PA. In conclusion, spraying rice plants with a low concentration of PA could decrease brown spot severity while preserving the photosynthetic capacity of the infected plants. The cellular damage generated by spraying the plants with the highest PA concentration did not favour the infection process of B. oryzae.

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Zinc‐dithiocarbimates for the control of Hemileia vastatrix: a versatile alternative

Rabello

Rubinger

Silva

et al. 2022

Pest Management Science

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BACKGROUND The purpose of this work was to investigate the potential use of zinc‐dithiocarbimate salts to control Hemileia vastatrix, the causal agent of the coffee leaf rust disease, and to evaluate their toxicity towards Apis mellifera, one of the most important coffee plant pollinators. RESULTS Zinc‐dithiocarbimate salts were prepared and fully characterized by infrared, proton (1H) and carbon‐13 (13C) nuclear magnetic resonance and elemental analyses of carbon (C), hydrogen (H), nitrogen (N) and zinc (Zn). X‐ray diffraction technique studies confirmed the proposed structures. The salts inhibited the germination of H. vastatrix spores in vitro, with a 50% inhibitory concentration (IC50) from 12 to 18 μmol.L−1 and a 90% inhibitory concentration (IC90) from 23 to 26 μmol.L−1. Zinc‐dithiocarbimate salts with the best in vitro results were selected for in vivo experiments with Coffea arabica var Caturra and with the pollinator A. mellifera. The results were similar to those of Mancozeb, a broad‐spectrum contact fungicide, with a good control of the disease and low toxicity to the honeybee. CONCLUSION The zinc‐dithiocarbimate complex salts have potential to control coffee leaf rust, with low toxicity to the pollinator insect. © 2022 Society of Chemical Industry.

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Soybean resistance to Phakopsora pachyrhizi infection is barely potentiated by boron

Cited by 6 publications

References 43 publications

Soybean plants sprayed with azelaic and hexanoic acids and infected by Phakopsora pachyrhizi display better photosynthetic performance and a robust antioxidative metabolism

Soybean plants sprayed with azelaic and hexanoic acids and infected by Phakopsora pachyrhizi display better photosynthetic performance and a robust antioxidative metabolism

Dual effect of picolinic acid in the photosynthetic performance of rice plants infected by Bipolaris oryzae

Zinc‐dithiocarbimates for the control of Hemileia vastatrix: a versatile alternative

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