Importance of potato late blight in Argentina, and the effect of fungicide treatments on yield increments over twenty years

Mantecon, J. D.

doi:10.4067/s0718-16202009000100011

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…In addition, the negative correlation between TTW and rAUDPC observed in this study indicated that late blight impacts negatively on tuber yield through destruction of foliage and consequent reduction of photosynthetic capacity. Similar results were also reported (Dowley et al, 2008;Mantecón, 2009) and indicated that late blight negatively impacts on potato yield. The present study corroborated previous studies (Brazil et al, 2002;Kaushik et al, 2007;Muthoni et al, 2013) that genotypes with good levels of resistance to potato diseases had high tuber yields.…”

Section: Discussionsupporting

confidence: 80%

Combining ability analysis of yield and late blight [Phytophthora infestans (Mont.) de Bary] resistance of potato germplasm in Rwanda

Muhinyuza¹,

Shimelis²,

Melis³

et al. 2016

Aust J Crop Sci

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Designed crosses among complementary parents and combining ability analysis are essential to recombine traits of economic importance and to select novel genotypes. The objective of this study was to estimate combining ability effects for yield and yield related traits and late blight resistance in potato. Crosses were performed using a 10 × 10 half diallel mating design to generate 45 F 1 s. Only 28 families with sufficient individuals and eight parents were field evaluated in experiments laid out in a 6 × 6 lattice design with two replications across two sites (Kinigi and Nyamagabe) in Rwanda. Late blight resistance was estimated using the relative area under the disease progress curve (rAUDPC: 100 % max). Furthermore, data on total tuber yield, total tuber number, and average tuber weight were collected and subjected to combining ability analyses. Results showed that additive gene action and nonadditive gene action were present affecting yield and late blight resistance in potato. Additive gene action was predominant over nonadditive gene action for both traits. All the families selected for further evaluation showed improved levels of late blight resistance and high yields. The study identified ten top families with high tuber yield and resistance to late blight for further evaluation and release.

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Section: Discussionsupporting

confidence: 80%

Combining ability analysis of yield and late blight [Phytophthora infestans (Mont.) de Bary] resistance of potato germplasm in Rwanda

Muhinyuza¹,

Shimelis²,

Melis³

et al. 2016

Aust J Crop Sci

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“…Como em outras situações observadas nesse trabalho, esse resultado pode ser justificado pela menor tenacidade de mancozebe em relação ao clorotalonil (Suehi;Latin, 1991). A considerável ação de mefenoxam no controle da requeima observada em Pilar do Sul também foi constatada por Mantecón (2009) em experimentos conduzidos durante 20 anos na Argentina. O fungicida mefenoxam (metalaxil-M), isômero mais ativo do metalaxil, pertence à classe das acilalaninas e representa um marco histórico no controle de oomicetos .…”

Section: Resultsunclassified

“…Os resultados obtidos permitem concluir mais uma vez que o uso de fungicidas no controle da requeima pode contribuir de forma direta sobre o valor comercial da produção. Os reflexos positivos do uso de fungicidas no controle da requeima sobre o rendimento observado neste trabalho também foram constatados para fluopicolide Tafforeau et al, 2006); mandipropamida (Kappes;; dimetomorfe (Heremans;Haesaert, 2003;Stein;Kirk, 2003); bentiavalicarbe (Hofman;Van Oudheusden, 2004); mefenoxam (Mantecón, 2009); ametoctradina (Tegge et al, 2012;Töfoli et al, 2014a); propamocarbe, zoxamida e famoxadona (Heremans;Haesaert, 2003). De maneira geral, observou-se que os maiores níveis de controle geraram as melhores produções comerciais.…”

Section: Resultsunclassified

Controle da requeima e pinta preta da batata por fungicidas e seu reflexo sobre a produtividade e a qualidade de tubérculos

et al. 2016

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RESUMO: A requeima (Phytophthora infestans) e a pinta preta (Alternaria solani) estão entre as doenças mais frequentes e destrutivas da cultura da batata. Com o objetivo de avaliar a ação de diferentes grupos fungicidas no controle dessas doenças, foram realizados dois experimentos em cultivo comercial de batata (cultivares Agata e Monalisa), localizados em Pilar do Sul, São Paulo, nas safras 2008 e 2009. O delineamento experimental utilizado foi o de blocos ao acaso, com 4 repetições, sendo cada parcela de 20 m2. As aplicações foram realizadas com um pulverizador costal, munido de barra de aplicação e pressão constante de 3 Bar. O volume de aplicação variou de 300 a 500 L.ha-1 em função do desenvolvimento da cultura. As variáveis avaliadas para as duas doenças foram: severidade em folhas, área abaixo da curva de progresso da doença (AACPD), produtividade total e comercial, e classificação de tubérculos. Os menores níveis de doença e aumentos significativos na produtividade comercial e qualidade de tubérculos foram observados nas parcelas tratadas com fluopicolide + propamocarbe, dimetomorfe + ametoctradina, mandipropamida + clorotalonil, mandipropamida, fenamidona + propamocarbe, bentiavalicarbe + fluazinam, seguidos de dimetomorfe + clorotalonil, mefenoxam + clorotalonil e famoxadona + cimoxanil + mancozebe para requeima, e azoxistrobina + difenoconazol, picoxistrobina, piraclostrobina + metconazol, trifloxistrobina + tebuconazol, azoxistrobina, boscalida + piraclostrobina, iprodiona + pirimetanil e ciprodinil para pinta preta.

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“…Potato ( Solanum tuberosum L.) is the fourth food crop worldwide and the most important horticultural crop in Argentina, where 80,000 hectares of potatoes are planted per year, mainly in the provinces of Córdoba and Buenos Aires [1]. Integrated control of diseases is crucial for this crop, where frequent agrochemical applications, particularly fungicides, are carried out to manage late blight disease caused by Phytophthora infestans [2,3]. An alternative strategy is based on promoting induced resistance through the application of environmentally friendly compounds.…”

Section: Introductionmentioning

confidence: 99%

Identification of potassium phosphite responsive miRNAs and their targets in potato

2019

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Micro RNAs (miRNAs) are small single strand non-coding RNAs that regulate gene expression at the post-transcriptional level, either by translational inhibition or mRNA degradation based on the extent of complementarity between the miRNA and its target mRNAs. Potato (Solanum tuberosum L.) is the most important horticultural crop in Argentina. Achieving an integrated control of diseases is crucial for this crop, where frequent agrochemical applications, particularly fungicides, are carried out. A promising strategy is based on promoting induced resistance through the application of environmentally friendly compounds such as phosphites, inorganic salts of phosphorous acid. The use of phosphites in disease control management has proven to be effective. Although the mechanisms underlying their effect remain unclear, we postulated that miRNAs could be involved. Therefore we performed next generation sequencing (NGS) in potato leaves treated and non treated with potassium phosphite (KPhi). We identified 25 miRNAs that were expressed differentially, 14 already annotated in miRBase and 11 mapped to the potato genome as potential new miRNAs. A prediction of miRNA targets showed genes related to pathogen resistance, transcription factors, and oxidative stress. We also analyzed in silico stress and phytohormone responsive cis-acting elements on differentially expressed pre miRNAs. Despite the fact that some of the differentially expressed miRNAs have been already identified, this is to our knowledge the first report identifying miRNAs responsive to a biocompatible stress resistance inducer such as potassium phosphite, in plants. Further characterization of these miRNAs and their target genes might help to elucidate the molecular mechanisms underlying KPhi-induced resistance.

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Importance of potato late blight in Argentina, and the effect of fungicide treatments on yield increments over twenty years

Cited by 7 publications

References 6 publications

Combining ability analysis of yield and late blight [Phytophthora infestans (Mont.) de Bary] resistance of potato germplasm in Rwanda

Combining ability analysis of yield and late blight [Phytophthora infestans (Mont.) de Bary] resistance of potato germplasm in Rwanda

Controle da requeima e pinta preta da batata por fungicidas e seu reflexo sobre a produtividade e a qualidade de tubérculos

Identification of potassium phosphite responsive miRNAs and their targets in potato

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