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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
21/10/2008 |
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Data da última atualização: |
21/10/2008 |
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Autoria: |
CARVALHO, C.A.B.de; PACIULLO, D.S.C.; ROSSIELLO, R.O.P.; DERESZ, F. |
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Título: |
Morfogênese do capim-elefante manejado sob duas alturas de resíduo pós-pastejo. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Boletim da Industria Animal, Nova Odessa, v.62, n.2, p.101-109, 2005. |
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Idioma: |
Português |
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Conteúdo: |
O experimento foi conduzido de outubro de 2002 até abril de 2003 em Coronel Pacheco, MG, com o objetivo de avaliar os efeitos de duas alturas de resíduo (50 e 100 cm) pós-pastejo e das classes de perfilhos (basais e aéreos) sobre a morfogênese e o acúmulo de massa seca de forragem do capim-elefante (Pennisetum purpureum Schum.) cv. Napier, em pastagens manejadas sob lotação rotacionada, com intervalo de desfolha de 30 dias. Foi usado o delineamento de blocos completos casualizados em arranjo de parcelas subdivididas com quatro repetições, sendo as alturas de resíduo alocadas às parcelas e as classes de perfilhos, às subparcelas. As variáveis analisadas foram: intervalo de aparecimento de folhas (filocrono), número de folhas por perfilho, comprimento de folhas, alongamento de folhas e colmos, taxa de crescimento, senescência e acúmulo líquido de massa seca de folhas e de colmos. As alturas de resíduo não influenciaram as variáveis estudadas. Durante a primavera, os perfilhos basais apresentaram menores filocronos e taxas de senescência, maior número de folhas por perfilho, maior potencial de perfilhamento e maiores taxas de crescimento e acúmulo líquido de massa seca de folhas e colmos. Os perfilhos aéreos aumentaram sua contribuição para a produção total de massa seca de forragem da pastagem, a partir do início do verão. |
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Palavras-Chave: |
Capim-elefante; Pastagem; Pennisetum purpureum. |
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Categoria do assunto: |
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Marc: |
LEADER 01941naa a2200193 a 4500
001 1061350
005 2008-10-21
008 2005 bl uuuu u00u1 u #d
100 1 $aCARVALHO, C.A.B.de
245 $aMorfogênese do capim-elefante manejado sob duas alturas de resíduo pós-pastejo.
260 $c2005
520 $aO experimento foi conduzido de outubro de 2002 até abril de 2003 em Coronel Pacheco, MG, com o objetivo de avaliar os efeitos de duas alturas de resíduo (50 e 100 cm) pós-pastejo e das classes de perfilhos (basais e aéreos) sobre a morfogênese e o acúmulo de massa seca de forragem do capim-elefante (Pennisetum purpureum Schum.) cv. Napier, em pastagens manejadas sob lotação rotacionada, com intervalo de desfolha de 30 dias. Foi usado o delineamento de blocos completos casualizados em arranjo de parcelas subdivididas com quatro repetições, sendo as alturas de resíduo alocadas às parcelas e as classes de perfilhos, às subparcelas. As variáveis analisadas foram: intervalo de aparecimento de folhas (filocrono), número de folhas por perfilho, comprimento de folhas, alongamento de folhas e colmos, taxa de crescimento, senescência e acúmulo líquido de massa seca de folhas e de colmos. As alturas de resíduo não influenciaram as variáveis estudadas. Durante a primavera, os perfilhos basais apresentaram menores filocronos e taxas de senescência, maior número de folhas por perfilho, maior potencial de perfilhamento e maiores taxas de crescimento e acúmulo líquido de massa seca de folhas e colmos. Os perfilhos aéreos aumentaram sua contribuição para a produção total de massa seca de forragem da pastagem, a partir do início do verão.
653 $aCapim-elefante
653 $aPastagem
653 $aPennisetum purpureum
700 1 $aPACIULLO, D.S.C.
700 1 $aROSSIELLO, R.O.P.
700 1 $aDERESZ, F.
773 $tBoletim da Industria Animal, Nova Odessa$gv.62, n.2, p.101-109, 2005.
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
15/04/2016 |
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Data da última atualização: |
15/04/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - B |
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Autoria: |
ARAUJO, L.; SOARES, J. M.; FILIPPI, M. C. C.; RODRIGUES, F. Á. |
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Título: |
Cytological aspects of incompatible and compatible interactions between rice, wheat and the blast pathogen Pyricularia oryzae. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Scientia Agricola, Piracicapa - USP/ESALQ - Scientia Agricola, v. 73, n. 2, p. 177-183, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
Blast, caused by the fungus Pyricularia oryzae, is an important disease affecting
rice and wheat yield worldwide. This study investigated the cytological aspects of incompatible
(non-host resistance) and compatible (host resistance) rice- (R_Po) and wheat- (W_Po) Pyricularia
oryzae isolate interactions. Inoculations of rice and wheat with the R_Po and W_Po isolates of
P. oryzae, respectively, were expected to be compatible interactions (host resistance), whereas
inoculations of rice and wheat with the W_Po and R_Po isolates of P. oryzae, respectively, were
considered to be incompatible interactions (non-host resistance). For the compatible interactions
(rice-R_Po and wheat-W_Po), fungal hyphae penetrated and colonized the epidermal cells
and also invaded many neighboring cells. By contrast, in the case of the incompatible interactions
(rice-W_Po and wheat-R_Po), fungal hyphae were not able to penetrate nor colonize the
epidermal cells, but when penetration did occur, the hyphae were restricted to the first-invaded
epidermal cell. The frequency of appressorial sites exhibiting infection hyphae within the epidermal
cell underlying an appressorium was greater in the case of the compatible interactions. By
contrast, unsuccessful penetrations with cytoplasmic granulation occurred with high frequency
in the incompatible wheat-R_Po and rice-W_Po interactions and the number of necrotic epidermal
cells underlying the appressorium was low for the rice-W_Po interaction as well as for the
wheat- R_Po interaction, where no symptoms of necrosis were exhibited. However, the opposite
was observed for the compatible interactions. The present study presents cytological features
associated with incompatible and compatible rice- and wheat-P. oryzae interactions that may
be useful to studies involving variability, coevolution, diagnosis, and regulation of quarantine or
even in a rice or wheat breeding program whose aim is to transfer genes involved in non-host
resistance to host resistance due to similarities in downstream mechanisms. MenosBlast, caused by the fungus Pyricularia oryzae, is an important disease affecting
rice and wheat yield worldwide. This study investigated the cytological aspects of incompatible
(non-host resistance) and compatible (host resistance) rice- (R_Po) and wheat- (W_Po) Pyricularia
oryzae isolate interactions. Inoculations of rice and wheat with the R_Po and W_Po isolates of
P. oryzae, respectively, were expected to be compatible interactions (host resistance), whereas
inoculations of rice and wheat with the W_Po and R_Po isolates of P. oryzae, respectively, were
considered to be incompatible interactions (non-host resistance). For the compatible interactions
(rice-R_Po and wheat-W_Po), fungal hyphae penetrated and colonized the epidermal cells
and also invaded many neighboring cells. By contrast, in the case of the incompatible interactions
(rice-W_Po and wheat-R_Po), fungal hyphae were not able to penetrate nor colonize the
epidermal cells, but when penetration did occur, the hyphae were restricted to the first-invaded
epidermal cell. The frequency of appressorial sites exhibiting infection hyphae within the epidermal
cell underlying an appressorium was greater in the case of the compatible interactions. By
contrast, unsuccessful penetrations with cytoplasmic granulation occurred with high frequency
in the incompatible wheat-R_Po and rice-W_Po interactions and the number of necrotic epidermal
cells underlying the appressorium was low for the rice-W_Po interaction as well as for t... Mostrar Tudo |
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Palavras-Chave: |
blast disease; host resistance; Magnaporthe oryzae; Oryza sativa; Triticum aestivum L. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02772naa a2200217 a 4500
001 1124984
005 2016-04-15
008 2016 bl uuuu u00u1 u #d
100 1 $aARAUJO, L.
245 $aCytological aspects of incompatible and compatible interactions between rice, wheat and the blast pathogen Pyricularia oryzae.$h[electronic resource]
260 $c2016
520 $aBlast, caused by the fungus Pyricularia oryzae, is an important disease affecting rice and wheat yield worldwide. This study investigated the cytological aspects of incompatible (non-host resistance) and compatible (host resistance) rice- (R_Po) and wheat- (W_Po) Pyricularia oryzae isolate interactions. Inoculations of rice and wheat with the R_Po and W_Po isolates of P. oryzae, respectively, were expected to be compatible interactions (host resistance), whereas inoculations of rice and wheat with the W_Po and R_Po isolates of P. oryzae, respectively, were considered to be incompatible interactions (non-host resistance). For the compatible interactions (rice-R_Po and wheat-W_Po), fungal hyphae penetrated and colonized the epidermal cells and also invaded many neighboring cells. By contrast, in the case of the incompatible interactions (rice-W_Po and wheat-R_Po), fungal hyphae were not able to penetrate nor colonize the epidermal cells, but when penetration did occur, the hyphae were restricted to the first-invaded epidermal cell. The frequency of appressorial sites exhibiting infection hyphae within the epidermal cell underlying an appressorium was greater in the case of the compatible interactions. By contrast, unsuccessful penetrations with cytoplasmic granulation occurred with high frequency in the incompatible wheat-R_Po and rice-W_Po interactions and the number of necrotic epidermal cells underlying the appressorium was low for the rice-W_Po interaction as well as for the wheat- R_Po interaction, where no symptoms of necrosis were exhibited. However, the opposite was observed for the compatible interactions. The present study presents cytological features associated with incompatible and compatible rice- and wheat-P. oryzae interactions that may be useful to studies involving variability, coevolution, diagnosis, and regulation of quarantine or even in a rice or wheat breeding program whose aim is to transfer genes involved in non-host resistance to host resistance due to similarities in downstream mechanisms.
653 $ablast disease
653 $ahost resistance
653 $aMagnaporthe oryzae
653 $aOryza sativa
653 $aTriticum aestivum L
700 1 $aSOARES, J. M.
700 1 $aFILIPPI, M. C. C.
700 1 $aRODRIGUES, F. Á.
773 $tScientia Agricola, Piracicapa - USP/ESALQ - Scientia Agricola$gv. 73, n. 2, p. 177-183, 2016.
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