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Registro Completo |
Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
Data corrente: |
24/09/2009 |
Data da última atualização: |
14/04/2010 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
RIBEIRO, L. R.; AMORIM, E. P.; CORDEIRO, Z. M.; SILVA, S. O.; DITA, M. A. |
Afiliação: |
Lindinéia Rios Ribeiro, UFRB; Edson Perito Amorim, CNPMF; Zilton José Maciel Cordeiro, CNPMF; Sebastião de Oliveira e Silva, CNPMF; Miguel Angel Dita, CNPMF. |
Título: |
Discrimination of banana genotypes for Fusarium wilt resistance in greenhouse. |
Ano de publicação: |
2009 |
Fonte/Imprenta: |
In: ISHS/PROMUSA BANANA SYMPOSIUM, 2009, Guangzhou, China. Global perspectives on asian challenges: programme and abstracts. Guangzhou: ISHS: Promusa, 2009. p. 46. |
Idioma: |
Inglês |
Conteúdo: |
Among the major constrains to banana breeding for Fusarium wilt resistance is the long period necessary for evaluations in the field and the lack of an effective method for early detection of resistant genotypes. This work aimed to establish a screening method for Fusarium wilt resistance under greenhouse conditions and to validate its reliability by challenging cultivars with different levels of resistance. In a firts step, two types of substrates (vermiculite and washed river sand) and three inoculum sources (conidial suspension from 1- week-old colonies grown in potato dextrose agar (PDA), conidial suspension produced after stress of 1-week-old colonies and Foc-colonised corn meal-sand (CMS) medium) were studied by inoculating 45-day-old plantlets of 'Silk' (AAB, susceptible) in a double-tray system. Symptoms were observed in plants grown in both substrates, but highest incidence occurred in washed river sand. Low infection rates were observed when using conidial suspension from PDA-grown colonies. By contrast, inocula from stressed colonies and CMS caused consistent symptom expression. Using washed river sand as substrate and inoculum from PDA-grown stressed colonies and/or Foc-colonised CMS, plantlets of the cultivares 'Tropical' (AAAB) and 'Thap Maeo' (AAB) (field intermediate resistance) were challenged. Plantlets of 'Silk' and 'Grande Naine' (AAA) were used as susceptible and resistant controls, respectively. While the incubation period in Silk was 13 days after inoculation (dai), in 'Tropical' and 'Thap Maeo' initial symptoms were only observed at 17 dai. No symptoms were observed in 'Grande Naine'. The disease progress evaluated based on external symptoms and rhizome discoloration scales allowed cultivars discrimination according to resistance levels. Since experiments were repeated three times with similar results, our research suggests that the method here described could be suitable for early detection of banana genotypes resistant to Fusarium wilt. MenosAmong the major constrains to banana breeding for Fusarium wilt resistance is the long period necessary for evaluations in the field and the lack of an effective method for early detection of resistant genotypes. This work aimed to establish a screening method for Fusarium wilt resistance under greenhouse conditions and to validate its reliability by challenging cultivars with different levels of resistance. In a firts step, two types of substrates (vermiculite and washed river sand) and three inoculum sources (conidial suspension from 1- week-old colonies grown in potato dextrose agar (PDA), conidial suspension produced after stress of 1-week-old colonies and Foc-colonised corn meal-sand (CMS) medium) were studied by inoculating 45-day-old plantlets of 'Silk' (AAB, susceptible) in a double-tray system. Symptoms were observed in plants grown in both substrates, but highest incidence occurred in washed river sand. Low infection rates were observed when using conidial suspension from PDA-grown colonies. By contrast, inocula from stressed colonies and CMS caused consistent symptom expression. Using washed river sand as substrate and inoculum from PDA-grown stressed colonies and/or Foc-colonised CMS, plantlets of the cultivares 'Tropical' (AAAB) and 'Thap Maeo' (AAB) (field intermediate resistance) were challenged. Plantlets of 'Silk' and 'Grande Naine' (AAA) were used as susceptible and resistant controls, respectively. While the incubation period in Silk was 13 days after inoc... Mostrar Tudo |
Thesagro: |
Banana; Fusariose; Genótipo. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02656naa a2200205 a 4500 001 1655784 005 2010-04-14 008 2009 bl uuuu u00u1 u #d 100 1 $aRIBEIRO, L. R. 245 $aDiscrimination of banana genotypes for Fusarium wilt resistance in greenhouse. 260 $c2009 520 $aAmong the major constrains to banana breeding for Fusarium wilt resistance is the long period necessary for evaluations in the field and the lack of an effective method for early detection of resistant genotypes. This work aimed to establish a screening method for Fusarium wilt resistance under greenhouse conditions and to validate its reliability by challenging cultivars with different levels of resistance. In a firts step, two types of substrates (vermiculite and washed river sand) and three inoculum sources (conidial suspension from 1- week-old colonies grown in potato dextrose agar (PDA), conidial suspension produced after stress of 1-week-old colonies and Foc-colonised corn meal-sand (CMS) medium) were studied by inoculating 45-day-old plantlets of 'Silk' (AAB, susceptible) in a double-tray system. Symptoms were observed in plants grown in both substrates, but highest incidence occurred in washed river sand. Low infection rates were observed when using conidial suspension from PDA-grown colonies. By contrast, inocula from stressed colonies and CMS caused consistent symptom expression. Using washed river sand as substrate and inoculum from PDA-grown stressed colonies and/or Foc-colonised CMS, plantlets of the cultivares 'Tropical' (AAAB) and 'Thap Maeo' (AAB) (field intermediate resistance) were challenged. Plantlets of 'Silk' and 'Grande Naine' (AAA) were used as susceptible and resistant controls, respectively. While the incubation period in Silk was 13 days after inoculation (dai), in 'Tropical' and 'Thap Maeo' initial symptoms were only observed at 17 dai. No symptoms were observed in 'Grande Naine'. The disease progress evaluated based on external symptoms and rhizome discoloration scales allowed cultivars discrimination according to resistance levels. Since experiments were repeated three times with similar results, our research suggests that the method here described could be suitable for early detection of banana genotypes resistant to Fusarium wilt. 650 $aBanana 650 $aFusariose 650 $aGenótipo 700 1 $aAMORIM, E. P. 700 1 $aCORDEIRO, Z. M. 700 1 $aSILVA, S. O. 700 1 $aDITA, M. A. 773 $tIn: ISHS/PROMUSA BANANA SYMPOSIUM, 2009, Guangzhou, China. Global perspectives on asian challenges: programme and abstracts. Guangzhou: ISHS: Promusa, 2009. p. 46.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
12/04/2017 |
Data da última atualização: |
17/04/2017 |
Autoria: |
TAVARES, C. J.; PEREIRA, L. S.; ARAÚJO, A. C. F.; MARTINS, D. A.; JAKELAITIS, A. |
Título: |
Crescimento inicial de plantas de pequi após aplicação de 2,4-D. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Pesquisa Florestal Brasileira, Colombo, v. 37, n. 89, p. 81-87, jan./mar. 2017. |
DOI: |
10.4336/2017.pfb.37.89.1280 |
Idioma: |
Português |
Conteúdo: |
O ácido 2,4-diclorafenóxacético (2,4-D) tem causado efeitos tóxicos em várias culturas cultivadas vizinhas ao local na qual foi destinado, devido à deriva durante sua aplicação. Objetivou-se, nesta pesquisa, avaliar o efeito da deriva simulada por meio de subdoses do herbicida 2,4-D em plantas de pequi (Caryocar brasiliense, Camb.). Testaram-se em blocos completos casualizados com seis repetições as doses de 0; 1,67; 3,35; 6,70; 16,75; 33,50; 67,00 e 134,00 g ha-1 de equivalente ácido do herbicida. A unidade experimental foi de um vaso contendo uma planta de pequi. A aplicação de 2,4-D causou sintomas leves de epinastia nas folhas, com valores entre 6,25 e 13,33% de fitointoxicação nas plantas de pequi; contudo, ocorreu a recuperação das plantas a partir dos 15 dias após a aplicação. Foi observado efeito hormético para as variáveis área foliar, área foliar específica e razão de área foliar. Porém, com o aumento das doses, verificou-se redução no crescimento das mudas, caracterizada pela diminuição nas variáveis foliares e massa seca total das plantas. Comparado ao controle (dose zero) foram observados maiores valores da partição de fotoassimilados para a parte aérea das plantas. |
Palavras-Chave: |
Herbicidas; Herbicide; Hormese. |
Thesagro: |
Fitotoxicidade. |
Thesaurus NAL: |
hormesis; phytotoxicity. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/159075/1/CRESCIMENTO.pdf
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Marc: |
LEADER 01966naa a2200253 a 4500 001 2068467 005 2017-04-17 008 2017 bl uuuu u00u1 u #d 024 7 $a10.4336/2017.pfb.37.89.1280$2DOI 100 1 $aTAVARES, C. J. 245 $aCrescimento inicial de plantas de pequi após aplicação de 2,4-D.$h[electronic resource] 260 $c2017 520 $aO ácido 2,4-diclorafenóxacético (2,4-D) tem causado efeitos tóxicos em várias culturas cultivadas vizinhas ao local na qual foi destinado, devido à deriva durante sua aplicação. Objetivou-se, nesta pesquisa, avaliar o efeito da deriva simulada por meio de subdoses do herbicida 2,4-D em plantas de pequi (Caryocar brasiliense, Camb.). Testaram-se em blocos completos casualizados com seis repetições as doses de 0; 1,67; 3,35; 6,70; 16,75; 33,50; 67,00 e 134,00 g ha-1 de equivalente ácido do herbicida. A unidade experimental foi de um vaso contendo uma planta de pequi. A aplicação de 2,4-D causou sintomas leves de epinastia nas folhas, com valores entre 6,25 e 13,33% de fitointoxicação nas plantas de pequi; contudo, ocorreu a recuperação das plantas a partir dos 15 dias após a aplicação. Foi observado efeito hormético para as variáveis área foliar, área foliar específica e razão de área foliar. Porém, com o aumento das doses, verificou-se redução no crescimento das mudas, caracterizada pela diminuição nas variáveis foliares e massa seca total das plantas. Comparado ao controle (dose zero) foram observados maiores valores da partição de fotoassimilados para a parte aérea das plantas. 650 $ahormesis 650 $aphytotoxicity 650 $aFitotoxicidade 653 $aHerbicidas 653 $aHerbicide 653 $aHormese 700 1 $aPEREIRA, L. S. 700 1 $aARAÚJO, A. C. F. 700 1 $aMARTINS, D. A. 700 1 $aJAKELAITIS, A. 773 $tPesquisa Florestal Brasileira, Colombo$gv. 37, n. 89, p. 81-87, jan./mar. 2017.
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Embrapa Florestas (CNPF) |
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