期刊
TROPICAL PLANT PATHOLOGY
卷 39, 期 6, 页码 457-463出版社
SOC BRASILEIRA FITOPATHOLOGIA
DOI: 10.1590/S1982-56762014000600007
关键词
Oryza sativa; fungal disease; host defense response; mineral nutrition; sheath blight
资金
- CNPq
- FAPEMIG
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - CAPES
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais
This study aimed to assess the ability of silicon (Si) to potentiate defense enzyme activities in rice leaf sheaths and thus reduce sheath blight, caused by Rhizoctonia solani, development. Rice plants of BR-Irga 409 and Labelle cultivars were grown in a hydroponic solution containing 0 (-Si) or 2 mM (+Si) Si and inoculated with R. solani. Silicon concentration in the leaf sheaths was significantly higher in the +Si plants than the -Si plants by 727% for BR-Irga 409 and 714% for Labelle. The area under relative lesion expansion progress curve was significantly lower for +Si plants than -Si plants, by 34.2% for BR-Irga 409 and 30.59% for Labelle. Increases in the activities of phenylalanine ammonia-lyases, peroxidases, polyphenoloxidases and chitinases in the leaf sheaths of plants supplied with Si, especially of those from BR-Irga 409, led to reduced progress of sheath blight lesions.
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