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Effects of Rice Blast Fungus (Pyricularia grisea) on Phenolics, Flavonoids, Antioxidant Capacity in Rice (Oryza sativa L.)
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HomeInternational Letters of Natural SciencesInternational Letters of Natural Sciences Vol. 61Effects of Rice Blast Fungus (Pyricularia grisea)...

Effects of Rice Blast Fungus (Pyricularia grisea) on Phenolics, Flavonoids, Antioxidant Capacity in Rice (Oryza sativa L.)

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Abstract:

Rice blast fungus (Pyricularia grisea) is one of the most problematic pathogen to significantly reduce rice production worldwide. In this study, after being inoculated with P. grisea, changes in phenolic components and antioxidant capacity and correlation with the resistant level against rice blast fungus were investigated. Among screened rice cultivars, AV-3 was the strongest resistant, whereas BII-3 was the most susceptible. It was found that although total contents of phenolics and flavonoids, and antioxidant capacities varied among studied varieties, no significant coefficient with the resistance against P. grisea was observed. After rice was affected by rice blast fungus, total phenolics and flavonoids were markedly reduced, but in contrast, the DPPH scavenging activities of only the susceptible rice cultivars was reduced. Among the 11 phenolic acids detected, catechol was found only in the tolerant cultivar AV-3, whereas the amount of cinnamic acid was increased after infection. Quantity of vanillin was also promoted, except in the susceptible cultivar BII-3 that was significantly reduced. Findings of this study showed that the resistant level against P. grisea was proportionally correlated to the antioxidant capacity. Catechol, cinnamic acid, and vanillin may play a role but it needs further elaboration. Observations of this study suggested that the infection of blast disease by reducing amount of phenolics and flavonoids that may weaken the resistance of rice against this detrimental fungus.

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International Letters of Natural Sciences (Volume 61)

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1-7

DOI:

https://doi.org/10.56431/p-g791ge

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Online since:

January 2017

Authors:

Nguyen Phu Toan, Pham Thi Thu Ha, Tran Dang Xuan*

Keywords:

Blast Disease, Phenolic Acids, Resistant Levels, Rice, Total Flavonoids, Total Phenolics

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