Reduction of brown leaf spot and changes in the chlorophyll a content induced by fungicides in cassava plants

Julião, Evair Cintra; Santana, Marthony Dornelas; Freitas-Lopes, Rejane do Livramento; Vieira, Alberto dos Passos; Carvalho, Josabete Salgueiro Bezerra de; Lopes, Ueder Pedro

doi:10.1007/s10658-020-02001-0

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…It is an emerging organic pollutant of concern (Angioni 2003; Elskus and Hackley, 2012). Triazole pesticides are widely applied during the production of food crops and also used as medicinal materials, consequently leading to the wide-spread distribution of pesticide residues in the environment (Julio, et al, 2020). Some studies have demonstrated that triadimefon has toxic effects on zebra sh and xenopus, likehormone dyscrasia and reproductive problems (Ma et al, 2020.…”

Section: Introductionmentioning

confidence: 99%

Uptake, translocation, and subcellular distribution of three triazole pesticides in rice

Wang

et al. 2021

Environ Sci Pollut Res

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Triazole pesticide is a widely-used pesticide for the control of pathogenic fungi in crops and its extensive use has caused food safety issues due to its uptake byedible crops. The residue of triazole pesticides has caused many toxicity risks and food safety problems. In this study, the uptake, translocation, and subcellular distribution of three triazole pesticides (triadimefon, tebuconazole, and epoxiconazole) in rice were investigated. The results showed that the three selected triazole pesticides could be taken up by rice roots, but their distribution in plant tissues was different. The accumulation of the three pesticides in rice root followed the order of epoxiconazole > tebuconazole > triadimefon, while a reversed order was observed in rice shoots. The movement of triazole pesticides within rice tissues involved both symplast and apoplast pathways, with triadimefon preferentially through the symplast pathway and epoxiconazole throughby the symplast pathway. The subcellular distribution reveals that all pesticides have a higher proportion in cell walls than in cell organelles and soluble components. Epoxiconazole has the highest accumulated capacity in the cell wall (45%-67%) and triadimefon was more concentrated in the soluble components (24%-29%). However, there exists no signi cant difference in the amount of three pesticides in cell organelles. The pesticide uptake, the movement of pesticides in symplast and apoplast, and the subcellular distribution of the three pesticides are related to the hydrophobicity of the three pesticides.

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Section: Introductionmentioning

confidence: 99%

Uptake, translocation, and subcellular distribution of three triazole pesticides in rice

Wang

et al. 2021

Environ Sci Pollut Res

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“…The infection started from the leaves, causing distortion and defoliation, and then ended in the roots. Moreover, distortion of leaves has been shown to be negatively affecting yield due to too much defoliation [4]. Depending on the surface area of the leaf affected, farmers can harvest small roots if microbial infection is extreme.…”

Section: Discussionmentioning

confidence: 99%

“…Brown leaf spot leads to losses in root yield due to the extensive defoliation of the plants [4]. The appearance of few to several brown spots on the upper surface of leaves of diseased cassava varieties is the key symptom of brown leaf spot disease [5].…”

Section: Introductionmentioning

confidence: 99%

First Time Morphological and Molecular Isolation of Epicoccum sorghinum Pathogenicity in the Cassava Brown Leaf Spot Disease in Kenya

Onyango,

Kituyi,

Hunja

et al. 2024

Preprint

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Cassava brown leaf spot (BLS) is among the most damaging diseases that significantly reduce cassava root yields. There has been need to find varieties resistant or tolerant to BLS. Hence, in this study drought-resistant cassava varieties were being agronomically screened in an experimental farm in Kitui County-Kenya. One variety in the plots, commonly referred to as Kasukari, was found to exhibit abnormal morphological aberrations whose cause necessitated systematic studies. Morphological, microscopic and DNA molecular identification techniques were applied on the isolates to identify the causal agent(s). 162 samples of the Kasukari variety were used to determine the prevalence and severity of the disease, while 15 samples were used to determine effects of the disease in the plots. The prevalence within the plots had no significant difference (ꭓ2 = 6, p-value = 0.1991). However, there was significant difference in the severity (ꭓ2 = 53.013, p-value = 1.166e-09). Pathogenicity tests of ten isolates were conducted in vitro whereby the spore suspension was made from each isolate and inoculated in detached fresh Kasukari variety leaves. Polymerase chain reaction performed by the universal primer, internal transcribed spacer (ITS) marker identified Alternaria sp, Epiccocum sp, Preussia sp, and Cladosporium sp. However, it was the Epiccocum sp that was reisolated from the reinfected Kasukari Cassava variety and hence confirmed as the main causal agent. Mycological keys found this fungus to be Epicoccum sorghinum. This is the first time for E. sorghinum to be associated with BLS in Kenya. Morphologically, the disease distorted leaves and reduced root quality. This infection necessitates further enriching and screening of the cassava genome for more resistant and tolerant varieties especially in light of the climate change phenomenon.

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“…It is an emerging organic pollutant of concern (Angioni 2003;Elskus and Hackley, 2012). Triazole pesticides are widely applied during the production of food crops and also used as medicinal materials, consequently leading to the wide-spread distribution of pesticide residues in the environment (Julio, et al, 2020). Some studies have demonstrated that triadimefon has toxic effects on zebra sh and xenopus, likehormone dyscrasia and reproductive problems (Ma et al, 2020, Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Uptake, Translocation and Subcellular Distribution of Three Triazole Pesticides in Rice

Wang

et al. 2021

Preprint

View full text Add to dashboard Cite

Triazole pesticide is a widely-used pesticide for the control of pathogenic fungi in crops and its extensive use has caused food safety issues due to its uptake byedible crops. The residue of triazole pesticides has caused many toxicity risks and food safety problems. In this study, the uptake, translocation, and subcellular distribution of three triazole pesticides (triadimefon, tebuconazole, and epoxiconazole) in rice were investigated. The results showed that the three selected triazole pesticides could be taken up by rice roots, but their distribution in plant tissues was different. The accumulation of the three pesticides in rice root followed the order of epoxiconazole > tebuconazole > triadimefon, while a reversed order was observed in rice shoots. The movement of triazole pesticides within rice tissues involved both symplast and apoplast pathways, with triadimefon preferentially through the symplast pathway and epoxiconazole throughby the symplast pathway. The subcellular distribution reveals that all pesticides have a higher proportion in cell walls than in cell organelles and soluble components. Epoxiconazole has the highest accumulated capacity in the cell wall (45%-67%) and triadimefon was more concentrated in the soluble components (24%-29%). However, there exists no significant difference in the amount of three pesticides in cell organelles. The pesticide uptake, the movement of pesticides in symplast and apoplast, and the subcellular distribution of the three pesticides are related to the hydrophobicity of the three pesticides.

show abstract

Reduction of brown leaf spot and changes in the chlorophyll a content induced by fungicides in cassava plants

Cited by 14 publications

References 15 publications

Uptake, translocation, and subcellular distribution of three triazole pesticides in rice

Uptake, translocation, and subcellular distribution of three triazole pesticides in rice

First Time Morphological and Molecular Isolation of Epicoccum sorghinum Pathogenicity in the Cassava Brown Leaf Spot Disease in Kenya

Uptake, Translocation and Subcellular Distribution of Three Triazole Pesticides in Rice

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