Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions.
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
Texto Completo: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096094 |
Resumo: | Cassava root rot diseases such as dry and black root rot are listed among the major threats, since its affect the main product (tuberous roots), causing a progressive decline in yield and affecting subsequent crop cycles, being the use of resistant varieties the most reliable control measure on field level. The objective of this study was to identify inoculation methods for the early evaluation of genotypes, considering the level of resistance to dry (DRR) and black (BRR) root rot diseases. Different methodologies and plant tissues were evaluated, based on the immersion of cassava tissues (roots and stem cuttings), soil infestation, and inoculation of detached tissues (leaves, tuberous roots and stem cuttings). The following parameters were evaluated for inoculations based on tissue immersion: disease index (ω); aerial part weight (g); fresh weight of the roots (g); and volume (cm3). For the inoculations on detached tissues, the percentage of lesioned area was determined. Immersion methods for roots and lesioned stems did not show typical symptoms of DRR and BRR during the two-month evaluation period. The soil infestation method did not differ from the stem immersion method as to the reduction of aerial part weight and the disease index, whereas both can be recommended for resistance selection trials. There was a positive correlation between the BRR and DRR data for the stem inoculation (r = 0.94, p = 0.001) and for DRR in the peel and root pulp (r = 0.73, p = 0.05). Therefore, the resistance within each tissue is apparently independent and should be compared with the behavior of the genotypes in the field. |
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Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions.MandiocaManihot EsculentaDoença de PlantaCassavaRoot diseasesNeoscytalidiumInoculation methodsCassava root rot diseases such as dry and black root rot are listed among the major threats, since its affect the main product (tuberous roots), causing a progressive decline in yield and affecting subsequent crop cycles, being the use of resistant varieties the most reliable control measure on field level. The objective of this study was to identify inoculation methods for the early evaluation of genotypes, considering the level of resistance to dry (DRR) and black (BRR) root rot diseases. Different methodologies and plant tissues were evaluated, based on the immersion of cassava tissues (roots and stem cuttings), soil infestation, and inoculation of detached tissues (leaves, tuberous roots and stem cuttings). The following parameters were evaluated for inoculations based on tissue immersion: disease index (ω); aerial part weight (g); fresh weight of the roots (g); and volume (cm3). For the inoculations on detached tissues, the percentage of lesioned area was determined. Immersion methods for roots and lesioned stems did not show typical symptoms of DRR and BRR during the two-month evaluation period. The soil infestation method did not differ from the stem immersion method as to the reduction of aerial part weight and the disease index, whereas both can be recommended for resistance selection trials. There was a positive correlation between the BRR and DRR data for the stem inoculation (r = 0.94, p = 0.001) and for DRR in the peel and root pulp (r = 0.73, p = 0.05). Therefore, the resistance within each tissue is apparently independent and should be compared with the behavior of the genotypes in the field.CAMILA HOHENFELD SANTIAGO, UFRB; MARIANA PEREIRA SANTANA, UFRB; LUIZ RODRIGUEZ CAIRO JUNIOR, UFRB; SAULO ALVES SANTOS DE OLIVEIRA, CNPMF; EDER JORGE DE OLIVEIRA, CNPMF.SANTIAGO, C, H.SANTANA, M. P.CAIRO JUNIOR, L. R.OLIVEIRA, S. A. S. deOLIVEIRA, E. J. de2018-09-21T00:47:22Z2018-09-21T00:47:22Z2018-09-2020182018-09-28T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleBragantia, Campinas, v. 77, n. 3, p.440-451, 2018.http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096094enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2018-09-21T00:47:29Zoai:www.alice.cnptia.embrapa.br:doc/1096094Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542018-09-21T00:47:29falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542018-09-21T00:47:29Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
title |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
spellingShingle |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. SANTIAGO, C, H. Mandioca Manihot Esculenta Doença de Planta Cassava Root diseases Neoscytalidium Inoculation methods |
title_short |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
title_full |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
title_fullStr |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
title_full_unstemmed |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
title_sort |
Methodologies for selecting cassava with resistance to dry and black root rot under controlled conditions. |
author |
SANTIAGO, C, H. |
author_facet |
SANTIAGO, C, H. SANTANA, M. P. CAIRO JUNIOR, L. R. OLIVEIRA, S. A. S. de OLIVEIRA, E. J. de |
author_role |
author |
author2 |
SANTANA, M. P. CAIRO JUNIOR, L. R. OLIVEIRA, S. A. S. de OLIVEIRA, E. J. de |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
CAMILA HOHENFELD SANTIAGO, UFRB; MARIANA PEREIRA SANTANA, UFRB; LUIZ RODRIGUEZ CAIRO JUNIOR, UFRB; SAULO ALVES SANTOS DE OLIVEIRA, CNPMF; EDER JORGE DE OLIVEIRA, CNPMF. |
dc.contributor.author.fl_str_mv |
SANTIAGO, C, H. SANTANA, M. P. CAIRO JUNIOR, L. R. OLIVEIRA, S. A. S. de OLIVEIRA, E. J. de |
dc.subject.por.fl_str_mv |
Mandioca Manihot Esculenta Doença de Planta Cassava Root diseases Neoscytalidium Inoculation methods |
topic |
Mandioca Manihot Esculenta Doença de Planta Cassava Root diseases Neoscytalidium Inoculation methods |
description |
Cassava root rot diseases such as dry and black root rot are listed among the major threats, since its affect the main product (tuberous roots), causing a progressive decline in yield and affecting subsequent crop cycles, being the use of resistant varieties the most reliable control measure on field level. The objective of this study was to identify inoculation methods for the early evaluation of genotypes, considering the level of resistance to dry (DRR) and black (BRR) root rot diseases. Different methodologies and plant tissues were evaluated, based on the immersion of cassava tissues (roots and stem cuttings), soil infestation, and inoculation of detached tissues (leaves, tuberous roots and stem cuttings). The following parameters were evaluated for inoculations based on tissue immersion: disease index (ω); aerial part weight (g); fresh weight of the roots (g); and volume (cm3). For the inoculations on detached tissues, the percentage of lesioned area was determined. Immersion methods for roots and lesioned stems did not show typical symptoms of DRR and BRR during the two-month evaluation period. The soil infestation method did not differ from the stem immersion method as to the reduction of aerial part weight and the disease index, whereas both can be recommended for resistance selection trials. There was a positive correlation between the BRR and DRR data for the stem inoculation (r = 0.94, p = 0.001) and for DRR in the peel and root pulp (r = 0.73, p = 0.05). Therefore, the resistance within each tissue is apparently independent and should be compared with the behavior of the genotypes in the field. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-09-21T00:47:22Z 2018-09-21T00:47:22Z 2018-09-20 2018 2018-09-28T11:11:11Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Bragantia, Campinas, v. 77, n. 3, p.440-451, 2018. http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096094 |
identifier_str_mv |
Bragantia, Campinas, v. 77, n. 3, p.440-451, 2018. |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096094 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
collection |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository.name.fl_str_mv |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
cg-riaa@embrapa.br |
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1794503462647496704 |