Leaf gas exchange and chlorophyll <i>a</i> fluorescence in soybean leaves infected by <i>Phakopsora pachyrhizi</i>

Rios, V. S.; Rios, Jonas Alberto; Aucique‐Pérez, Carlos Eduardo; Silveira, Patrícia Ricardino; Barros, Alexandre Guimarães de Almeida; Rodrigues, Fabrício Á.

doi:10.1111/jph.12663

Cited by 26 publications

(23 citation statements)

References 47 publications

(89 reference statements)

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“…Also, increased Fm values were observed for Bragantina plants in ISi+, which was similar to those values described for the healthy control plants (NISi-) (Table 2), indicating increases the efficiency of light use by Si-supplementation as previously reported by Nwugo and Huerta (2008). Furthermore, a sharp decrease of Fm values occurred in ISi-, indicating functional alterations on photosystems followed by drastic reductions of Chltotal, which ultimately affected the efficiency of excitation energy from the light-harvesting capacity (Rios et al 2017).…”

Section: Discussionsupporting

confidence: 85%

“…Frequently, alterations in leaf photochemistry and carbon metabolism are related to lower Rubisco activity and changes in the capacity for ribulose-1,5-bisphosphate regeneration (Hiscox and Israelstam 1979). Reductions of E in soybean leaves infected by Phakopsora pachyrhizi can be associated with reduced gs, and therefore associated with stomatal closure (Rios et al 2017). Reductions of E maintain a favorable water status in the infected leaves (Resende et al 2012).…”

Section: Discussionmentioning

confidence: 99%

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Silicon improves the photosynthetic performance of black pepper plants inoculated with Fusarium solani f. sp. piperis

D’Addazio¹,

Silva²,

Jardim³

et al. 2020

Photosynt.

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This study evaluated the effect of silicon (Si)-supplementation in controlling the fusariosis in two Piper nigrum cultivars (Bragantina and Kottanadan). We hypothesized that susceptible cultivar improves the photosynthetic performance with Si-supplementation. Under greenhouse conditions, six-month-old plants were treated with silicon 30 and 15 d before inoculation with Fusarium solani f. sp. piperis and compared with untreated plants and with healthy control plants. All samples remained photosynthetically active after infection. Chlorophyll content, chlorophyll a fluorescence, and leaf gas-exchange parameters were less affected in Si-supplemented plants as well as healthy control plants. The net carbon assimilation, stomatal conductance, associated with higher internal carbon values suggest that the lower CO2 influx in inoculated plants of Bragantina cultivar was caused by photochemical and biochemical limitations. Si-supplementation reduced the disease severity improving protection, apparently associated with the preservation of photosynthetic performance, especially for Bragantina cultivar.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Silicon improves the photosynthetic performance of black pepper plants inoculated with Fusarium solani f. sp. piperis

D’Addazio¹,

Silva²,

Jardim³

et al. 2020

Photosynt.

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“…Photosynthesis, the main driver to achieve high crop yield, is the physiological process of plants that is mostly affected by the infection of pathogens (Bassanezi et al , Dallagnol et al , Rios et al , Viecelli et al ). The assessment of the photosynthetic performance of plants infected by pathogens provides insights regarding the mechanisms underlying their infection process and help to find novel strategies for disease control (Rolfe and Scholes ).…”

Section: Introductionmentioning

confidence: 99%

Effect of glutamate on Pyricularia oryzae infection of rice monitored by changes in photosynthetic parameters and antioxidant metabolism

Dias

Rios

Einhardt

et al. 2020

Physiologia Plantarum

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Considering the importance of blast caused by Pyricularia oryzae in the decrease of rice yield worldwide, this study aimed to assess the photosynthetic performance [leaf gas exchange and chlorophyll (Chl) a fluorescence parameters as well as the photosynthetic pigments concentration], the activities of antioxidant enzymes [ascorbate peroxidase, catalase (CAT), peroxidase (POX), superoxide dismutase (SOD), glutathione peroxidase (GPX), glutathione reductase (GR) and glutathione‐S‐transferase] and concentrations of hydrogen peroxide (H2O2) and malondialdehyde (MDA) in the leaves of rice plants non‐supplied (−Glu) or supplied (+Glu) with glutamate (Glu) and non‐infected or infected by P. oryzae. Blast severity was reduced in the leaves of +Glu plants. On the infected leaves of +Glu plants, the values for internal CO2 concentration were lower while the values for net carbon assimilation rate, stomatal conductance as well as for the concentrations of Chl a, Chl b and carotenoids were higher in comparison to infected leaves of −Glu plants. The functionality of the photosynthetic apparatus was preserved in the infected leaves of +Glu plants. The activities of CAT, GPX, GR, POX and SOD increased in the infected leaves of both −Glu and +Glu plants compared to their non‐inoculated counterparts, but their activities were lower for +Glu plants. The lower activity of these antioxidative enzymes was triggered by the reduced hydrogen peroxide concentration in the infected leaves of +Glu plants resulting in lower MDA concentration. It can be concluded that photosynthesis was less impaired in infected plants supplied with glutamate due to the lower biochemical constraints for CO2 fixation. Moreover, there was a need for lower activity of reactive oxygen species scavenging enzymes in infected leaves of plants supplied with glutamate due to the lower oxidative stress imposed by P. oryzae infection.

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“…The infection of plants by pathogens of different lifestyles negatively affects photosynthesis because the reduction of healthy leaf area (Dallagnol, Rodrigues, Martins, Cavatte, & DaMatta, 2011; Rios et al, 2018). Reduction in pigments concentration, structural damage to the chloroplasts, impairments in energy dissipation via chlorophyll a fluorescence and increase in leaf temperature are the most notable negative effects resulting from pathogens infection on their hosts (Petit, Vaillant, Boulay, Clément, & Fontaine, 2006; Resende et al., 2012; Zhao, Glynn, Glaz, Comstock, & Sood, 2011).…”

Section: Introductionmentioning

confidence: 99%

Phosphites of manganese and zinc potentiate the resistance of common bean against infection by Xanthomonas axonopodis pv. phaseoli

Costa

Debona

Silveira

et al. 2020

Journal of Phytopathology

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Common bacterial blight (CBB), caused by Xanthomonas axonopodis pv. phaseoli var. fuscans (Xapf), negatively impact common bean production globally. Considering the potential of phosphites to protect plants against different diseases, this study investigated the potential of using manganese (Mn) and zinc (Zn) phosphites in common bean for CBB control. Plants were inoculated with Xapf 48 hr after being sprayed with water (control) and solutions (7.5 ml/L) of Mn and Zn phosphites. The area under common bacterial blight progress curve (AUCBBPC) was significantly lower by 34% and 59% for Mn and Zn phosphite treatments in comparison with the control treatment. The AUCBBPC was significantly reduced by 38% for Zn phosphite‐sprayed plants compared to Mn phosphite treatment. Phosphite‐sprayed plants displayed higher values for area under the curves of net CO2 assimilation rate, stomatal conductance to water vapour, transpiration rate and internal‐to‐ambient CO2 concentration ratio than non‐sprayed plants. This indicates the effect of Mn and Zn phosphites in attenuating the photochemical dysfunctions caused by Xapf infection. Moreover, plants sprayed with Mn phosphite displayed higher values for area under the curves of efficiency in capturing the excitation energy of open reaction centres of PSII and electron transport rate than those non‐sprayed indicating their capacity to preserve the capture and the use of the collected energy more efficiently. Lower AUCBBPC for Zn phosphite‐sprayed plants resulted in higher concentrations of total chlorophylls. The Zn phosphite‐sprayed plants showed higher values for area under the curves of β‐1,3‐glucanase, phenylalanine ammonia‐lyase, polyphenoloxidase, ascorbate peroxidase and superoxide dismutase activities. The Zn phosphite spray primed the plants to enhance their defence response and antioxidant capacity to reduce Xapf‐triggered oxidative stress with the preservation of the photosynthetic apparatus more efficiently.

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Leaf gas exchange and chlorophyll a fluorescence in soybean leaves infected by Phakopsora pachyrhizi

Cited by 26 publications

References 47 publications

Silicon improves the photosynthetic performance of black pepper plants inoculated with Fusarium solani f. sp. piperis

Silicon improves the photosynthetic performance of black pepper plants inoculated with Fusarium solani f. sp. piperis

Effect of glutamate on Pyricularia oryzae infection of rice monitored by changes in photosynthetic parameters and antioxidant metabolism

Phosphites of manganese and zinc potentiate the resistance of common bean against infection by Xanthomonas axonopodis pv. phaseoli

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