Foliar application of silicon decreases wheat blast symptoms without impairing photosynthesis

Oliveira, Tássia Boeno; Aucique‐Pérez, Carlos Eduardo; Rodrigues, Fabrício Á.

doi:10.1590/1678-4499.20180379

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…A total of seven plants were grown per plastic pot containing 2 kg of substrate and fertilized weekly according to Oliveira et al. (2019). Plants were kept in a glasshouse (temperature of 25 ± 2°C during the day and 22 ± 2°C during the night, relative humidity of 75 ± 5% and natural photosynthetically active radiation).…”

Section: Methodsmentioning

confidence: 99%

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Wheat susceptibility to blast is enhanced by a photosynthetic inhibitor

Oliveira

Aucique‐Pérez

Einhardt

et al. 2021

Journal of Phytopathology

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Considering blast, caused by Pyricularia oryzae, as a critical threat to wheat yield and the importance of photosynthesis as the source of energy used by plants to activate their mechanisms of defence to counteract pathogen infections, this study aimed to investigate whether wheat plants compromised in their photosynthetic process by using an inhibitor of photosynthesis could become more susceptible to blast. Plants from cultivars BRS 220 (moderately resistant) and BRS Guamirim (susceptible) were non‐sprayed (‐DCMU plants) or sprayed (+DCMU plants) with a solution (10 μM) of 3‐([3,4‐dichlorophenyl]‐1,1‐dimethylurea) (DCMU) at 24 hr before inoculation with P. oryzae. Blast progressed much faster on the leaves of +DCMU plants from cultivars BRS 220 and BRS Guamirim in comparison with ‐DCMU plants of these cultivars. Increased susceptibility of plants from the two cultivars to blast caused by DCMU was associated with its negative effect on the photosynthetic apparatus, decreasing phenylalanine ammonia‐lyase activity and reducing the concentration of total soluble phenolics. Chitinase activity for the infected plants from the two cultivars was lower compared with non‐inoculated ‐DCMU plants but was greater for inoculated +DCMU plants. Distinctly, β‐1,3‐glucanases activity was kept stable for inoculated +DCMU plants. In conclusion, manipulation of the photosynthetic process of wheat plants by using DCMU allowed to understand their response to P. oryzae infection at the physiological level and reinforced the concept that photosynthesis was important for wheat resistance to blast.

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Section: Methodsmentioning

confidence: 99%

“…Production of P. oryzae inoculum and plant inoculation followed the procedures described by Oliveira et al. (2019). After inoculation, plants were transferred to a growth chamber (temperature of 25 ± 5°C and relative humidity of 85 ± 5%) for 24 hr under darkness.…”

Section: Methodsmentioning

confidence: 99%

Wheat susceptibility to blast is enhanced by a photosynthetic inhibitor

Oliveira

Aucique‐Pérez

Einhardt

et al. 2021

Journal of Phytopathology

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“…Likewise, the impairment caused by blast on the photosynthetic process, primarily related to the F v /F m parameter, on wheat leaves, was in lesser extent on the plants sprayed with potassium silicate [69]. Furthermore, authors did not detect any significant alteration on the gas exchange and Chla fluorescence parameter for plants sprayed three times (every 96 h interval) as the potassium silicate rates increased from 2.5 to 12.5 g L −1 indicating that potassium silicate do not cause perturbation to the photosynthetic machinery of wheat plants.…”

Section: Physiological Effects Of Silicon In Wheat Under Pathogen Stressmentioning

confidence: 95%

“…Leaf application of potassium silicate reduced blast severity, but the positive effect was variable among cultivars [51]. Another study evaluating leaf application of potassium silicate indicated blast severity reduction on the same proportion of fungicide treatment, but no additive or synergistic effect was observed mixing fungicide and potassium silicate [69]. Two-years field experiment showed that Si, applied in the soil as calcium and magnesium silicate in the furrow, and as potassium silicate applied on the leaves, reduced the incidence and severity of blast in the spike, but it effect was variable both with years and cultivars [70].…”

Section: Wheat Diseases Affected By Siliconmentioning

confidence: 99%

Silicon Use in the Integrated Disease Management of Wheat: Current Knowledge

Dallagnol¹,

Ramos²,

Dorneles³

2022

Current Trends in Wheat Research

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Silicon (Si) is a benefic element for higher plants such as wheat (Triticum aestivum) in which it is accumulated in the shoot tissues. In this crop, leaf diseases and spike diseases are the cause of yield losses, and therefore several studies had been conducted under field and greenhouse conditions to demonstrate that plants supplied with Si reduced most of the diseases damage due to the amelioration of the plant defenses. However, the benefits of Si depend on its accumulation in the plant’s tissue, which is influenced by the availability of the element in the soil as well as the up-take ability of the wheat cultivar. In this chapter we present the current knowledge about the mechanisms of Si absorption and its accumulation in different tissues of the wheat plant, the most studied options for silicate fertilization, and the benefits of Si on grain yield. We also present some insight of the effect of Si-supply in wheat on the reduction of main leaf and ear diseases, bringing evidence and explanation of the defense mechanisms involved. In addition, we provide an overview of the Si effect on the physiology (gas exchange, chlorophyll a fluorescence and carbohydrate metabolism) of the wheat plant. Finally, questions have been raised about the Si uses as fertilizer that still needs to be answered. We recognized that some studies have enhanced our understanding of Si providing evidence of the Si use as disease management strategy, but further research is needed to make the Si uses a simple task for wheat growers under field condition.

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