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Registro Completo
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Biblioteca(s): |
Epagri-Sede. |
|
Data corrente: |
16/01/2015 |
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Data da última atualização: |
16/01/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
BERMÚDEZ-CARDONA, M. B.; WORDELL FILHO, J. A.; RODRIGUES, F. A. |
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Título: |
Leaf Gas Exchange and Chlorophyll a Fluorescence in Maize Leaves Infected with Stenocarpella macrospora. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Phytopathology, St. Paul, v. 105, n. 1, p. 26-34, 2015. |
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Idioma: |
Português |
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Conteúdo: |
This study investigated the effect of macrospora leaf spot (MLS),
caused by Stenocarpella macrospora, on photosynthetic gas exchange
parameters and chlorophyll a fluorescence parameters determined in
leaves of plants from two maize cultivars (?ECVSCS155? and ?HIB
32R48H?) susceptible and highly susceptible, respectively, to S. macrospora.
MLS severity was significantly lower in the leaves of plants from
ECVSCS155 relative to the leaves of plants from HIB 32R48H. In both
cultivars, net CO2 assimilation rate, stomatal conductance, and transpiration
rate significantly decreased, while the internal to ambient CO2 concentration
ratio increased in inoculated plants relative to noninoculated
plants. The initial fluorescence and nonphotochemical quenching
significantly increased in inoculated plants of ECVSCS155 and HIB
32R48H, respectively, relative to noninoculated plants. The maximum
fluorescence, maximum PSII quantum efficiency, coefficient for photochemical
quenching, and electron transport rate significantly decreased in
inoculated plants relative to noninoculated plants. For both cultivars,
concentrations of total chlorophyll (Chl) (a + b) and carotenoids and the
Chl a/b ratio significantly decreased in inoculated plants relative to
noninoculated plants. In conclusion, the results from the present study
demonstrate, for the first time, that photosynthesis in the leaves of maize
plants is dramatically affected during the infection process of S. macrospora,
and impacts are primarily associated with limitations of a diffusive
and biochemical nature. MenosThis study investigated the effect of macrospora leaf spot (MLS),
caused by Stenocarpella macrospora, on photosynthetic gas exchange
parameters and chlorophyll a fluorescence parameters determined in
leaves of plants from two maize cultivars (?ECVSCS155? and ?HIB
32R48H?) susceptible and highly susceptible, respectively, to S. macrospora.
MLS severity was significantly lower in the leaves of plants from
ECVSCS155 relative to the leaves of plants from HIB 32R48H. In both
cultivars, net CO2 assimilation rate, stomatal conductance, and transpiration
rate significantly decreased, while the internal to ambient CO2 concentration
ratio increased in inoculated plants relative to noninoculated
plants. The initial fluorescence and nonphotochemical quenching
significantly increased in inoculated plants of ECVSCS155 and HIB
32R48H, respectively, relative to noninoculated plants. The maximum
fluorescence, maximum PSII quantum efficiency, coefficient for photochemical
quenching, and electron transport rate significantly decreased in
inoculated plants relative to noninoculated plants. For both cultivars,
concentrations of total chlorophyll (Chl) (a + b) and carotenoids and the
Chl a/b ratio significantly decreased in inoculated plants relative to
noninoculated plants. In conclusion, the results from the present study
demonstrate, for the first time, that photosynthesis in the leaves of maize
plants is dramatically affected during the infection process of S. macrospora,
and impacts are prim... Mostrar Tudo |
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Palavras-Chave: |
Milho; Zea mays L. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02107naa a2200169 a 4500
001 1122721
005 2015-01-16
008 2015 bl uuuu u00u1 u #d
100 1 $aBERMÚDEZ-CARDONA, M. B.
245 $aLeaf Gas Exchange and Chlorophyll a Fluorescence in Maize Leaves Infected with Stenocarpella macrospora.$h[electronic resource]
260 $c2015
520 $aThis study investigated the effect of macrospora leaf spot (MLS), caused by Stenocarpella macrospora, on photosynthetic gas exchange parameters and chlorophyll a fluorescence parameters determined in leaves of plants from two maize cultivars (?ECVSCS155? and ?HIB 32R48H?) susceptible and highly susceptible, respectively, to S. macrospora. MLS severity was significantly lower in the leaves of plants from ECVSCS155 relative to the leaves of plants from HIB 32R48H. In both cultivars, net CO2 assimilation rate, stomatal conductance, and transpiration rate significantly decreased, while the internal to ambient CO2 concentration ratio increased in inoculated plants relative to noninoculated plants. The initial fluorescence and nonphotochemical quenching significantly increased in inoculated plants of ECVSCS155 and HIB 32R48H, respectively, relative to noninoculated plants. The maximum fluorescence, maximum PSII quantum efficiency, coefficient for photochemical quenching, and electron transport rate significantly decreased in inoculated plants relative to noninoculated plants. For both cultivars, concentrations of total chlorophyll (Chl) (a + b) and carotenoids and the Chl a/b ratio significantly decreased in inoculated plants relative to noninoculated plants. In conclusion, the results from the present study demonstrate, for the first time, that photosynthesis in the leaves of maize plants is dramatically affected during the infection process of S. macrospora, and impacts are primarily associated with limitations of a diffusive and biochemical nature.
653 $aMilho
653 $aZea mays L
700 1 $aWORDELL FILHO, J. A.
700 1 $aRODRIGUES, F. A.
773 $tPhytopathology, St. Paul$gv. 105, n. 1, p. 26-34, 2015.
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