Data/hora: 03/06/2024 12:41:45

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - A
Data corrente: | 16/01/2015
Data da última atualização: | 16/01/2015
Autoria: | BERMÚDEZ-CARDONA, M. B.; WORDELL FILHO, J. A.; RODRIGUES, F. A.
Título: | Leaf Gas Exchange and Chlorophyll a Fluorescence in Maize Leaves Infected with Stenocarpella macrospora.
Ano de publicação: | 2015
Fonte/Imprenta: | Phytopathology, St. Paul, v. 105, n. 1, p. 26-34, 2015.
Idioma: | Português

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.

Palavras-Chave: | Milho; Zea mays L.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_35371.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (97786-1) - UPC - AP - DD -  -  -  - DIS