Data/hora: 17/06/2024 08:10:19

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 09/11/2017
Data da última atualização: | 09/11/2017
Autoria: | BUENO, A. C. S. O.; CASTRO, G. L. S.; SILVA JUNIOR, D. D.; PINHEIRO, H. A.; FILIPPI, M. C. C.; SILVA, G. B.
Afiliação: | A. C. S. O. BUENO, UFRA; G. L. S. CASTRO, UFRA; D. D. SILVA JUNIOR, UNVERSIDADE FEDERAL DO AMAZONAS; H. A. PINHEIRO, UFRA; MARTA CRISTINA CORSI DE FILIPPI, CNPAF; GISELE BARATA DA SILVA, UFRA.
Título: | Response of photosynthesis and chlorophyll a fluorescence in leaf scald-infected rice under influence of rhizobacteria and silicon fertilizer.
Ano de publicação: | 2017
Fonte/Imprenta: | Plant Pathology, v. 66, n. 9, p. 1487-1495, Dec. 2017.
DOI: | 10.1111/ppa.12690
Idioma: | Inglês
Conteúdo: | Leaf scald caused by Monographella albescens reduces the photosynthetic area, causing yield losses in rice. This study investigated the efficacy of the rhizobacteria Burkholderia pyrrocinia (BRM-32113) and Pseudomonas fluorescens (BRM-32111), combined with silicon (Si) fertilization, to reduce lesion size and the area under the disease progress curve (AUDPC), as well as to minimize the negative effects on gas exchange, chlorophyll a fluorescence, chlorophyll content and the activity of oxidative stress enzymes. The experiment used a completely randomized design with four replications and seven treatments. Compared with plants only fertilized with Si, plants fertilized with Si and treated with BRM-32113 showed reductions of 22% in scald lesion expansion and 37% in AUDPC, a 27% increase in the rate of CO2 assimilation (A), a 33% decrease in the internal CO2 concentration (Ci), and a 40% increase in ascorbate peroxidase activity. It was therefore concluded that the combination of BRM-32113 with Si fertilization reduces the severity of leaf scald, protecting the photosynthetic apparatus, thus representing a sustainable method of reducing the loss of income caused by leaf scald in rice.
Palavras-Chave: | Gas-exchange.
Thesagro: | Arroz; Clorofila; Oryza sativa; Pseudomonas Fluorescens; Rizosfera.
Thesaurus Nal: | Burkholderia pyrrocinia; Chlorophyll; Monographella albescens; Rhizosphere bacteria; Rice; Scald diseases.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (34925-1) - UPC - AP - DD - 2017 -  - 2017 - DIS