Pub Date : 2022-10-01DOI: 10.1590/0100-5405/269402
E. M. Reis, A. C. Reis, Mateus Zanatta
{"title":"Quanto a eficácia do tratamento de sementes com fungicidas. - Ênfase em grandes culturas de grãos","authors":"E. M. Reis, A. C. Reis, Mateus Zanatta","doi":"10.1590/0100-5405/269402","DOIUrl":"https://doi.org/10.1590/0100-5405/269402","url":null,"abstract":"","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42345234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-01DOI: 10.1590/0100-5405/260498
Guadalupe García-Solano, F. Palemón-Alberto, S. Á. Ortega-Acosta, A. Damián-Nava, P. Juárez-López, Paul García-Escamilla, E. Villar-Luna, B. Cruz-Lagunas
ABSTRACT In Mexico, Creole corn has presented problems related to seed rot. Therefore, the objective of this study was to determine the frequency of fungi associated with Creole corn seeds. From January to February 2019, 13 Creole corn samples were collected from several localities in Guerrero, Mexico. The samples were processed in PDA culture medium and the frequency of each fungus was estimated based on cultural characteristics and taxonomic keys. Considering symptomatic corn seed samples, Fusarium oxysporum was recorded in eight samples at 97.2%, followed by F. graminearum, isolated from race “Olotillo 1” at 94.4% and from race “Cónico pepitilla” at 58.3%. Phomopsis sp. was isolated at 100% from race “Olotillo 2”. Gibberella moniliformis was isolated from “Elotes Occidental 1” at 83.3%, while the least frequent isolate (19.4%) from “Pepitilla” was Sarocladium strictum, which was recorded in three samples at the low values of 11.1% and 2.8% for races “Arrocillo 2” and “Pepitilla”, respectively; Talaromyces variabilis was found in two samples at 11.1% and 2.8% from “Arrocillo 2” and “Cónico pepitilla”, respectively; Stenocarpella macrospora was isolated at 72.2% from “Pepitilla”. Aspergillus flavus was obtained from “Cónico Pepitilla” at 16.7%, while Setosphaeria turcica and Emericella sp. were less frequently isolated. Considering asymptomatic seeds of race “Cónico pepitilla”, F. oxysporum was isolated at 8.3%, Fusarium acuminatum at 8.3% and Gibberella moniliformis at 41.7%; from asymptomatic seeds of “Olotillo 1” and “Olotillo 2”, Phomopsis sp. was isolated at 50% and Rhizoctonia solani at 50%, respectively. In the present study, the fungi F. oxysporum, Phomopsis sp., G. moniliformis and F. graminearum were most frequently associated with Creole corn seeds.
{"title":"Frequency of fungi associated with Creole corn seeds under different environmental conditions in Guerrero, Mexico","authors":"Guadalupe García-Solano, F. Palemón-Alberto, S. Á. Ortega-Acosta, A. Damián-Nava, P. Juárez-López, Paul García-Escamilla, E. Villar-Luna, B. Cruz-Lagunas","doi":"10.1590/0100-5405/260498","DOIUrl":"https://doi.org/10.1590/0100-5405/260498","url":null,"abstract":"ABSTRACT In Mexico, Creole corn has presented problems related to seed rot. Therefore, the objective of this study was to determine the frequency of fungi associated with Creole corn seeds. From January to February 2019, 13 Creole corn samples were collected from several localities in Guerrero, Mexico. The samples were processed in PDA culture medium and the frequency of each fungus was estimated based on cultural characteristics and taxonomic keys. Considering symptomatic corn seed samples, Fusarium oxysporum was recorded in eight samples at 97.2%, followed by F. graminearum, isolated from race “Olotillo 1” at 94.4% and from race “Cónico pepitilla” at 58.3%. Phomopsis sp. was isolated at 100% from race “Olotillo 2”. Gibberella moniliformis was isolated from “Elotes Occidental 1” at 83.3%, while the least frequent isolate (19.4%) from “Pepitilla” was Sarocladium strictum, which was recorded in three samples at the low values of 11.1% and 2.8% for races “Arrocillo 2” and “Pepitilla”, respectively; Talaromyces variabilis was found in two samples at 11.1% and 2.8% from “Arrocillo 2” and “Cónico pepitilla”, respectively; Stenocarpella macrospora was isolated at 72.2% from “Pepitilla”. Aspergillus flavus was obtained from “Cónico Pepitilla” at 16.7%, while Setosphaeria turcica and Emericella sp. were less frequently isolated. Considering asymptomatic seeds of race “Cónico pepitilla”, F. oxysporum was isolated at 8.3%, Fusarium acuminatum at 8.3% and Gibberella moniliformis at 41.7%; from asymptomatic seeds of “Olotillo 1” and “Olotillo 2”, Phomopsis sp. was isolated at 50% and Rhizoctonia solani at 50%, respectively. In the present study, the fungi F. oxysporum, Phomopsis sp., G. moniliformis and F. graminearum were most frequently associated with Creole corn seeds.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48287465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-01DOI: 10.1590/0100-5405/224923
L. L. Marcuzzo, Andrei Hang Vanderlinde
{"title":"Sobrevivência de Pseudomonas marginalis pv. marginalis no solo, agente etiológico da queima bacteriana do alho","authors":"L. L. Marcuzzo, Andrei Hang Vanderlinde","doi":"10.1590/0100-5405/224923","DOIUrl":"https://doi.org/10.1590/0100-5405/224923","url":null,"abstract":"","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47420269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-01DOI: 10.1590/0100-5405/265657
Qandeel Ishfaqe, Muhammad Imtiaz Shafiq, Mubashra Raza Ali, M. S. Haider
ABSTRACT The worldwide spread of Geminiviruses and its vector has been attributed to the high rate of recombination, mutation, presence of alternate hosts, transport of plant material, global human activity along with global trade, new agricultural practices and climate change; therefore, the most severe viral diseases among crops have grown in almost all regions of the world, including cassava viral diseases in Africa, cotton leaf curl disease in Pakistan, and multiple diseases related to tomatoes, legumes and cucurbits in India and all over the world. Begomovirus is the major and largest genus of Geminiviridae which has shown a worldwide increase in its variations and distribution by affecting previously unaffected plants. The increasing population has augmented the demand for a sustainable agriculture boost, but begomoviruses have become a continual threat to the world’s agriculture. Numerous control strategies have been used for the viral invasion of the world as pathogens but begomoviruses continually overcome the control methods, and this has generated a need to end this competition between researchers and begomoviruses. The present review summarizes all strategies used against begomoviruses and provides a comprehensive comparison among all control methods, their drawbacks, and future insights.
{"title":"Is the best resistance strategy against begomoviruses yet to come? A Comprehensive Review","authors":"Qandeel Ishfaqe, Muhammad Imtiaz Shafiq, Mubashra Raza Ali, M. S. Haider","doi":"10.1590/0100-5405/265657","DOIUrl":"https://doi.org/10.1590/0100-5405/265657","url":null,"abstract":"ABSTRACT The worldwide spread of Geminiviruses and its vector has been attributed to the high rate of recombination, mutation, presence of alternate hosts, transport of plant material, global human activity along with global trade, new agricultural practices and climate change; therefore, the most severe viral diseases among crops have grown in almost all regions of the world, including cassava viral diseases in Africa, cotton leaf curl disease in Pakistan, and multiple diseases related to tomatoes, legumes and cucurbits in India and all over the world. Begomovirus is the major and largest genus of Geminiviridae which has shown a worldwide increase in its variations and distribution by affecting previously unaffected plants. The increasing population has augmented the demand for a sustainable agriculture boost, but begomoviruses have become a continual threat to the world’s agriculture. Numerous control strategies have been used for the viral invasion of the world as pathogens but begomoviruses continually overcome the control methods, and this has generated a need to end this competition between researchers and begomoviruses. The present review summarizes all strategies used against begomoviruses and provides a comprehensive comparison among all control methods, their drawbacks, and future insights.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46326135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-01DOI: 10.1590/0100-5405/243830
Cristiano Moreira, Roseline da Silva Côelho, F. Graichen
{"title":"Sensibilidade in vitro de Sclerotium rolfsii a fungicidas","authors":"Cristiano Moreira, Roseline da Silva Côelho, F. Graichen","doi":"10.1590/0100-5405/243830","DOIUrl":"https://doi.org/10.1590/0100-5405/243830","url":null,"abstract":"","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46065037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/0100-5405/245876
Sari Ramon Mohali Castillo, Stephan Miller, J. Stewart
ABSTRACT In tropical and subtropical regions worldwide, diseases can be major limiting factors to coffee (Coffea arabica) production, a highly valued crop internationally. Our aim was to identify Colletotrichum spp. and other fungal species associated with Coffee Berry Disease (CBD) and anthracnose on coffee twigs, which can greatly inhibit crop production. Concatenated phylogenetic analyses of ApMat and GS loci were used to identify two Colletotrichum species. Colletotrichum siamense was isolated from symptomatic mature and green berries that were both infested and uninfected with Coffee Berry Borer (CBB) and from twigs displaying anthracnose symptoms. Colletrotrichum alienum was isolated from twigs showing anthracnose symptoms. Along with these two Colletotrichum species, association of Fusarium incarnatum (= Fusarium semitectum) and Fusarium solani was found. Identification of Fusarium species was obtained through combined datasets of partial TEF1 and RPB2. Fusarium isolates came from ripe coffee fruits displaying symptoms of CBD, infested or not with CBB, and coffee twigs. In addition, concatenation of four gene regions (ITS, TEF1, CAL, TUB2) allowed the identification of another fungus, together with isolates from coffee twigs with anthracnose, Diaporthe pseudomangiferae. This is the first report of Colletotrichum siamense and Colletotrichum alienum, along with the fungi Fusarium solani and Diaporthe pseudomangiferae, associated with berry diseases on Coffea arabica in the state of Mérida, Venezuela.
{"title":"Colletotrichum spp. and other fungi associated with anthracnose on Coffea arabica L. in Mérida State, Venezuela","authors":"Sari Ramon Mohali Castillo, Stephan Miller, J. Stewart","doi":"10.1590/0100-5405/245876","DOIUrl":"https://doi.org/10.1590/0100-5405/245876","url":null,"abstract":"ABSTRACT In tropical and subtropical regions worldwide, diseases can be major limiting factors to coffee (Coffea arabica) production, a highly valued crop internationally. Our aim was to identify Colletotrichum spp. and other fungal species associated with Coffee Berry Disease (CBD) and anthracnose on coffee twigs, which can greatly inhibit crop production. Concatenated phylogenetic analyses of ApMat and GS loci were used to identify two Colletotrichum species. Colletotrichum siamense was isolated from symptomatic mature and green berries that were both infested and uninfected with Coffee Berry Borer (CBB) and from twigs displaying anthracnose symptoms. Colletrotrichum alienum was isolated from twigs showing anthracnose symptoms. Along with these two Colletotrichum species, association of Fusarium incarnatum (= Fusarium semitectum) and Fusarium solani was found. Identification of Fusarium species was obtained through combined datasets of partial TEF1 and RPB2. Fusarium isolates came from ripe coffee fruits displaying symptoms of CBD, infested or not with CBB, and coffee twigs. In addition, concatenation of four gene regions (ITS, TEF1, CAL, TUB2) allowed the identification of another fungus, together with isolates from coffee twigs with anthracnose, Diaporthe pseudomangiferae. This is the first report of Colletotrichum siamense and Colletotrichum alienum, along with the fungi Fusarium solani and Diaporthe pseudomangiferae, associated with berry diseases on Coffea arabica in the state of Mérida, Venezuela.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43215482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/0100-5405/266033
A. Goulart
ABSTRACT The present study was conducted to evaluate the efficacy of fungicide seed treatment in the control of soybean seedling damping-off caused by Rhizoctonia solani under greenhouse conditions. The experiment was carried out in Dourados, Mato Grosso do Sul State, Brazil. Treated and untreated soybean seeds were sown in previously sterilized sand, contained in plastic trays, in equidistant individual wells at 3cm depth. The soybean sowing density was 200 seeds/plastic tray. Inoculation with R. solani was done by homogeneous distribution of the fungal inoculum onto the substrate surface (5.0g/tray). The fungus was grown for 35 days on autoclaved black oat seeds ground to powder with a mill (1mm). Seedling emergence, pre and post-emergence damping-off, injured seedlings and disease index (severity) were evaluated according to McKinney formula. Fungicide seed treatments had a significant effect (P ≤ 0.05) on seedling emergence, pre and post-emergence damping-off, injured seedlings and disease index (severity). The best results were obtained for fludioxonil+metalaxyl-M+thiabendazole and fipronil+pyraclostrobin+thiophanate-methyl, followed by carbendazim+thiram+pencycuron and thiophanate-methyl+fluazinam. The least efficient treatments were carbendazim+thiram, fludioxonil+metalaxyl-M and carboxin+thiram. Pearson correlation analysis indicated that injured seedlings and disease index were positively correlated (R=0.92). This means that the greater the number of injured seedlings, the greater the disease index and the less efficient the fungicide. The fungicides used in the present study did not have any phytotoxic effect on soybean seedlings.
{"title":"Effectiveness of fungicide seed treatment in the control of soybean seedling dampingoff caused by Rhizoctonia solani under greenhouse conditions","authors":"A. Goulart","doi":"10.1590/0100-5405/266033","DOIUrl":"https://doi.org/10.1590/0100-5405/266033","url":null,"abstract":"ABSTRACT The present study was conducted to evaluate the efficacy of fungicide seed treatment in the control of soybean seedling damping-off caused by Rhizoctonia solani under greenhouse conditions. The experiment was carried out in Dourados, Mato Grosso do Sul State, Brazil. Treated and untreated soybean seeds were sown in previously sterilized sand, contained in plastic trays, in equidistant individual wells at 3cm depth. The soybean sowing density was 200 seeds/plastic tray. Inoculation with R. solani was done by homogeneous distribution of the fungal inoculum onto the substrate surface (5.0g/tray). The fungus was grown for 35 days on autoclaved black oat seeds ground to powder with a mill (1mm). Seedling emergence, pre and post-emergence damping-off, injured seedlings and disease index (severity) were evaluated according to McKinney formula. Fungicide seed treatments had a significant effect (P ≤ 0.05) on seedling emergence, pre and post-emergence damping-off, injured seedlings and disease index (severity). The best results were obtained for fludioxonil+metalaxyl-M+thiabendazole and fipronil+pyraclostrobin+thiophanate-methyl, followed by carbendazim+thiram+pencycuron and thiophanate-methyl+fluazinam. The least efficient treatments were carbendazim+thiram, fludioxonil+metalaxyl-M and carboxin+thiram. Pearson correlation analysis indicated that injured seedlings and disease index were positively correlated (R=0.92). This means that the greater the number of injured seedlings, the greater the disease index and the less efficient the fungicide. The fungicides used in the present study did not have any phytotoxic effect on soybean seedlings.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48790815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/0100-5405/247029
L. L. Marcuzzo
RESUMO Com o objetivo de validar um sistema de previsão, com diferentes níveis de valores de severidade estimada comparada à pulverização convencional no controle da cercosporiose da beterraba, foram conduzidos experimentos em Rio do Sul/SC durante os ciclos de cultivo de 2018, 2019 e 2020. Os programas de pulverização foram estabelecidos de acordo com valores de severidade estimada (SE) do sistema de Marcuzzo et al., atribuindo-se valores acumulados de 0,15; 0,25, e 0,35 SE e no sistema convencional com pulverizações a cada 5 e 7 dias. Não houve diferença significativa entre os tratamentos quanto à produtividade em todos os ciclos. A AACPD, a severidade final e a taxa de progresso da doença não diferiram entre os tratamentos, mas no sistema de previsão com SE=0,35 o número de pulverizações foi de 28; 57 e 67% menor em relação ao sistema de aplicação semanal nos três anos de avaliação. O uso do sistema de previsão mostrou ser uma ferramenta viável no manejo do da cercosporiose da beterraba em Santa Catarina e encontra-se disponível gratuitamente para uso da cadeia produtiva na plataforma Agroconnect da EPAGRI-CIRAM disponível em http://www.ciram.sc.gov.br/agroconnect/.
{"title":"Validação de um sistema de previsão para a cercosporiose da beterraba","authors":"L. L. Marcuzzo","doi":"10.1590/0100-5405/247029","DOIUrl":"https://doi.org/10.1590/0100-5405/247029","url":null,"abstract":"RESUMO Com o objetivo de validar um sistema de previsão, com diferentes níveis de valores de severidade estimada comparada à pulverização convencional no controle da cercosporiose da beterraba, foram conduzidos experimentos em Rio do Sul/SC durante os ciclos de cultivo de 2018, 2019 e 2020. Os programas de pulverização foram estabelecidos de acordo com valores de severidade estimada (SE) do sistema de Marcuzzo et al., atribuindo-se valores acumulados de 0,15; 0,25, e 0,35 SE e no sistema convencional com pulverizações a cada 5 e 7 dias. Não houve diferença significativa entre os tratamentos quanto à produtividade em todos os ciclos. A AACPD, a severidade final e a taxa de progresso da doença não diferiram entre os tratamentos, mas no sistema de previsão com SE=0,35 o número de pulverizações foi de 28; 57 e 67% menor em relação ao sistema de aplicação semanal nos três anos de avaliação. O uso do sistema de previsão mostrou ser uma ferramenta viável no manejo do da cercosporiose da beterraba em Santa Catarina e encontra-se disponível gratuitamente para uso da cadeia produtiva na plataforma Agroconnect da EPAGRI-CIRAM disponível em http://www.ciram.sc.gov.br/agroconnect/.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47246096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/0100-5405/264271
N. López-Cardona, A. Guevara-Castro, Marcela López-Casallas, Lederson Gañán-Betancur
{"title":"Occurrence of seed decay caused by Diaporthe longicolla on soybean in Colombia","authors":"N. López-Cardona, A. Guevara-Castro, Marcela López-Casallas, Lederson Gañán-Betancur","doi":"10.1590/0100-5405/264271","DOIUrl":"https://doi.org/10.1590/0100-5405/264271","url":null,"abstract":"","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46838671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/0100-5405/260846
J. L. Pires, E. Luz, Gilson Soares de Melo
ABSTRACT Over a 10-year period, the number of vegetative brooms and floral cushion brooms was evaluated in each plant of progenies from a North Carolina II mating design with the clones: Ca 5, CAB 5003, Chuao 120, ICS 1, Moq 216, Scavina 12, Scavina 6 and SPA 5 as group 1 of progenitors, and CC 10, CCN 34, Cepec 90, CSul 3, Ma 16, RB 36, SGu 26 and SIAL 70 as group 2. Highly significant effects were found for progenitors and interactions among progenitors, indicating that the species Theobroma cacao has a high level of genetic diversity for resistance to witches’ broom. Results demonstrated the presence of different genes, alleles or gene combinations among progenitors; the association of various genes, alleles or gene combinations in the progenies, and the presence of additive and dominant effects on the inheritance of these factors. There was also significant loss of inheritance of Scavina 6, the most traditional source of resistance, when it was used alone but not when it was combined with other clones bearing resistance genes or alleles. This demonstrated that gene association increases resistance durability in that source.
{"title":"Resistance of cacao tree to witches’ broom disease – A study of inheritance","authors":"J. L. Pires, E. Luz, Gilson Soares de Melo","doi":"10.1590/0100-5405/260846","DOIUrl":"https://doi.org/10.1590/0100-5405/260846","url":null,"abstract":"ABSTRACT Over a 10-year period, the number of vegetative brooms and floral cushion brooms was evaluated in each plant of progenies from a North Carolina II mating design with the clones: Ca 5, CAB 5003, Chuao 120, ICS 1, Moq 216, Scavina 12, Scavina 6 and SPA 5 as group 1 of progenitors, and CC 10, CCN 34, Cepec 90, CSul 3, Ma 16, RB 36, SGu 26 and SIAL 70 as group 2. Highly significant effects were found for progenitors and interactions among progenitors, indicating that the species Theobroma cacao has a high level of genetic diversity for resistance to witches’ broom. Results demonstrated the presence of different genes, alleles or gene combinations among progenitors; the association of various genes, alleles or gene combinations in the progenies, and the presence of additive and dominant effects on the inheritance of these factors. There was also significant loss of inheritance of Scavina 6, the most traditional source of resistance, when it was used alone but not when it was combined with other clones bearing resistance genes or alleles. This demonstrated that gene association increases resistance durability in that source.","PeriodicalId":39992,"journal":{"name":"Summa Phytopathologica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42167683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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