Data/hora: 16/06/2024 07:56:30

Biblioteca(s): | Epagri-Sede.
Data corrente: | 14/04/2011
Data da última atualização: | 14/04/2011
Autoria: | LOBATO, A. K. S.; GONÇALVES-VIDIGAL, M. C.; VIDIGAL FILHO, P. S.; ANDRADE, C. A. B.; KVITSCHAL, M. V.; BONATO, C. M.
Afiliação: | Epagri
Título: | Relationships between leaf pigments and photosynthesis in common bean plants infected by anthracnose.
Ano de publicação: | 2010
Fonte/Imprenta: | New Zealand Journal of Crop and Horticultural Science, London, v. 38, n. 1, p. 29-37, 2010.
Idioma: | Inglês
Notas: | ISSN, 0114-0671

Conteúdo:

The objective of this study was to: first, evaluate the infection effects caused by Colletotrichum lindemuthianum pathogen (race 2047)on photosynthetic pigments and gas exchanges in Phaseolus vulgaris plants (cv. Mexico 222); and, second, determine infection effects on leaf pigments and their consequences on photosynthesis rate. A completely randomized design with a factorial scheme was used, combining two treatments (control and inoculated)and three evaluation periods (4th, 8th and 12th day). Carotenoid levels presented decreases of 28.3% and 35% during the 8th and 12th day after infection, when control and inoculated plants were compared. Correlation analysis demonstrated the direct relationship between carotenoids and photosynthesis rate (r = 0.84). Total chlorophyll in infected plants had progressive reductions of 6.4%, 20.6% and 21.3% on the 4th, 8th and 12th day, respectively, when treated and untreated
plants were compared. Total chlorophyll with photosynthesis (r = 0.85)also revealed a
significant and linear correlation. The photosynthetic rate in infected plants decreased by
22%, 49.9% and 77.3% on the 4th, 8th and 12th days after the inoculation, respectively.
Anthracnose infection also induced negative effects concerning stomatal conductance, transpiration, photosynthesis and water use efficiency. Our results demonstrate that leaf pigment reduction as a result of pathogens was the main cause of lower gaseous exchanges in infected plants.

Palavras-Chave: | Carotenoids; Chlorophyll; Colletotrichum lindemuthianum; Gaseous exchange; Phaseolus vulgaris; Photosynthesis.
Categoria do assunto: | --
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_1180.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (78389-1) - UPC - AP - -- -  -  -  - DIS