Photosynthesis inhibitor-mediated biochemical and physiological changes in wheat plants challenged with Pyricularia oryzae

Blast, caused by Pyricularia oryzae , has negatively impacted wheat yield. This study investigated whether the level of resistance of wheat plants from a moderately resistant cultivar (BRS 220) could be lowered by an inhibitor of photosynthesis following further inoculation with P. oryzae . A 2 × 2...

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Bibliographic Details
Published in:Tropical plant pathology 2021-12, Vol.46 (6), p.608-621
Main Authors: Oliveira, Tássia Boeno, Aucique-Pérez, Carlos Eduardo, Ávila, Rodrigo Teixeira, Oliveira, Franklin Magnum, Peixoto, Leonardo Azevedo, Einhardt, Andersom Milech, Rodrigues, Fabrício Ávila
Format: Article
Language:English
Subjects:
Amino acids
Anions
Antioxidants
Ascorbic acid
Biomedical and Life Sciences
Blast
Carbohydrate metabolism
Carbohydrates
Carbon dioxide
Carbon dioxide concentration
Catalase
Crop yield
Cultivars
Deposition
Disease resistance
Diuron
Factorial experiments
Hydrogen peroxide
Inoculation
L-Ascorbate peroxidase
Leaves
Life Sciences
Malondialdehyde
Original Article
Peroxidase
Photosynthesis
Photosynthetic apparatus
Plant Pathology
Plant tissues
Plants
Pyricularia oryzae
Stomata
Stomatal conductance
Sucrose
Superoxide anions
Superoxide dismutase
Transpiration
Water vapor
Wheat
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Summary:Blast, caused by Pyricularia oryzae , has negatively impacted wheat yield. This study investigated whether the level of resistance of wheat plants from a moderately resistant cultivar (BRS 220) could be lowered by an inhibitor of photosynthesis following further inoculation with P. oryzae . A 2 × 2 factorial experiment, consisting of non-inoculated (NI) and inoculated (I) plants sprayed with 3-(3,4-dichlorophenyl)-1,1-dimethylurea) (DCMU; 10 μM solution) (+DCMU plants) or water (−DCMU plants), was arranged in a completely randomized design. Photosynthetic performance, histochemical detection of superoxide anion radical and hydrogen peroxide in leaf tissues, activities of antioxidant enzymes, and concentrations of carbohydrates, amino acids, and protein were determined in plants from −DCMU NI, −DCMU I, +DCMU NI, and +DCMU I treatments. The +DCMU I plants increased their susceptibility (high severity values) to blast and showed great photosynthetic changes (lower net CO 2 assimilation rate ( A ), stomatal conductance to water vapor, and transpiration rate values and higher internal CO 2 concentration values) than −DCMU I plants. Highest superoxide anion radical deposition indicated oxidative damage in the leaves of +DCMU NI and +DCMU I plants. Many necrotic lesions and high malondialdehyde concentration were noticed for +DCMU I plants. There was great hydrogen peroxide deposition in the leaves of +DCMU I plants from 48 to 72 h after inoculation. Ascorbate peroxidase, catalase, peroxidase, and superoxide dismutase activities were great for −DCMU I plants than for +DCMU I plants. Lower A values for +DCMU I plants limited carbohydrates synthesis and resulted in lower starch concentration. Lower sucrose concentration and great fructose and glucose concentrations were noticed for +DCMU I plants compared to +DCMU NI plants. The results of this study indicate that a proper photosynthetic apparatus, great carbohydrate metabolism, and a more robust antioxidative system are all needed for wheat resistance against blast and can be collectively altered by a photosynthesis inhibitor.
ISSN:1983-2052
1982-5676
1983-2052
DOI:10.1007/s40858-021-00455-z