Glutamate potentiates rice resistance to blast

Dias, Camila Carneiro; Rios, Jonas Alberto; Einhardt, Andersom Milech; Oliveira, Lillian Matias de; Chaves, Joicy Aparecida Alves; Rodrigues, Fabrício Á.

doi:10.1007/s40858-019-00327-7

Cited by 1 publication

(8 citation statements)

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“…Several authors reported a negative effect of pathogen infection on F v /F m at the earliest stages of their infection process (Aucique-Pérez et al, 2014;Dias et al, 2020;Einhardt et al, 2020). The became more resistant to blast mainly due to great CHI and GLU activities (Dias et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Increased PAL activity was noticed for infected plants at the initial stage of B. oryzae infection, especially for those supplied with 0.5 mM K. According to Tonnessen et al (2015), rice resistance to bacterial blight, blast and sheath blight was intrinsically linked to high PAL activity. The spraying of rice plants with glutamate increased rice resistance to blast, possibly due to high PAL activity in the early stages of P. oryzae infection (Dias et al, 2020). PPO is involved in the oxidation of phenolics to produce quinones, while the lignification of cell walls has POX involvement (Kaur et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…However, reductions in A and g s far exceed the reductions noticed for C i , indicating limitations of a biochemical nature. Changes in A and g s that might impact the C i values have been reported to occur in different host–pathogen interactions (Aucique‐Pérez et al., 2014; Dallagnol et al., 2011; Debona et al., 2014; Dias et al., 2020; Einhardt et al., 2020). Biochemical limitations were also supported by changes in the photochemical activity based on F v / F m values, suggesting impairment of CO 2 fixation at the biochemical level in infected rice leaves.…”

Section: Discussionmentioning

confidence: 99%

“…Photosynthesis is greatly impaired on leaves of different plant species infected by pathogens (Aucique‐Pérez et al., 2014; Dallagnol et al., 2011; Debona et al., 2014; Dias et al., 2020; Einhardt et al., 2020). Interestingly, deficiency or inadequate K supply to crops impairs photosynthetic carbon assimilation, ultimately affecting plant growth and reducing yield (Rengel et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, decreases in g s in accordance with lower C i values, suggested that reductions in A values were more related to diffusive limitations in the infected rice leaves.However, reductions in A and g s far exceed the reductions noticed for C i , indicating limitations of a biochemical nature. Changes in A and g s that might impact the C i values have been reported to occur in different host-pathogen interactions(Aucique-Pérez et al, 2014;Dallagnol et al, 2011;Debona et al, 2014;Dias et al, 2020;Einhardt et al, 2020). Biochemical limitations were also supported by changes in the photochemical activity based on F v /F m values, suggesting F I G U R E 8 Activities of superoxide dismutase (SOD) (a, b), catalase (CAT) (c, d), ascorbate peroxidase (APX) (e, f) and glutathione reductase (GR) (g, h) determined on rice leaves of plants grown in hydroponic culture containing 0.5, 1.0 and 2.5 mM of potassium (K) and noninoculated (a, c, e, g) or inoculated (b, d, f, h) with Bipolaris oryzae.…”

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confidence: 99%

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Rice resistance against Bipolaris oryzae infection is mediated by lower foliar potassium concentration

Silva,

Einhardt,

Brás

et al. 2023

Plant Pathology

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Brown spot, caused by Bipolaris oryzae, is a very important disease of rice. This study investigated the effect of potassium (K) on rice resistance to brown spot. The working hypothesis tested was that higher foliar K concentration could allow plants to respond more efficiently against fungal infection. Plants were grown in nutrient solution amended with three K rates (0.5, 1.0 and 2.5 mM) and noninoculated or inoculated with B. oryzae. The photosynthetic performance of plants, activities of defence and antioxidant enzymes and the concentrations of reactive oxygen species, phenolics and lignin were determined. Foliar K concentration was significantly higher by 38% and 91% for plants supplied with 1.0 and 2.5 mM K, respectively, compared to plants supplied with 0.5 mM K. Brown spot severity was significantly higher (≥20%) for plants supplied with 1.0 and 2.5 mM K than those supplied with 0.5 mM K (≤15%). Higher brown spot severity for plants supplied with 2.5 mM K resulted in changes in the photosynthetic apparatus, reduced chlorophyll a + b and carotenoids concentrations, and higher production of hydrogen peroxide and superoxide anion radical. In contrast, higher activities of defence and antioxidant enzymes and more production of phenolics for plants supplied with 0.5 mM K helped them to cope with B. oryzae infection more efficiently. In conclusion, rice resistance against brown spot was achieved by keeping a lower foliar K concentration linked to more active defence reactions, a robust antioxidative system and less damage to the photosynthetic apparatus.

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