Microscopic aspects of silicon-mediated rice resistance to leaf scald
dc.contributor.author | Araujo, Leonardo | |
dc.contributor.author | Paschoalino, Rayane Silva | |
dc.contributor.author | Rodrigues, Fabrício Ávila | |
dc.date.accessioned | 2017-10-09T18:40:09Z | |
dc.date.available | 2017-10-09T18:40:09Z | |
dc.date.issued | 2015-07-29 | |
dc.description.abstract | This study investigated the effect of silicon (Si) on the potentiation of rice resistance against leaf scald at the microscopic level. Rice plants (‘Primavera’) were grown in a nutrient solution containing 0 (−Si) or 2 mM (+Si) Si. The foliar Si concentration of the +Si plants (3.6 dag/kg) increased in comparison with the −Si plants (0.3 dag/kg). An X-ray microanalysis revealed that the leaf tissue of +Si plants infected with Microdochium oryzae had higher peaks and deposition of insoluble Si than that of −Si plants. The high foliar Si concentration for the +Si plants reduced the expansion of leaf scald lesions. Scanning electron microscopy revealed that fungal hyphae and appressorium-like structures of M. oryzae were more abundant in the leaf surface of −Si plants relative to +Si plants. At both histopathological and ultrastructural levels, fungal hyphae grew abundantly into the leaf tissue of −Si plants. By contrast, rice cell walls were rarely degraded and fungal hyphae were often surrounded by amorphous granular material in the leaf tissue of +Si plants. Conidiophores emerged from stomata 36 h after fungal penetration, and conidia were noticed inside the leaf tissue of the −Si plants in great abundance. The collective results of the present study showed a high concentration and deposition of Si and a considerable deposition of phenolic-like compounds in the leaf tissue of +Si plants. These results indicate that the potentiation of the phenylpropanoid pathway in these plants supplied with Si was favorable for the increase in rice resistance to leaf scald. | en |
dc.format | pt-BR | |
dc.identifier.issn | 1208-6002 | |
dc.identifier.uri | https://doi.org/10.1094/PHYTO-04-15-0109-R | |
dc.identifier.uri | http://www.locus.ufv.br/handle/123456789/11964 | |
dc.language.iso | eng | pt-BR |
dc.publisher | Biochemistry and Cell Biology | pt-BR |
dc.relation.ispartofseries | Volume 106, Number 2 Pages 132-141 February 2016 | pt-BR |
dc.rights | Open Access | pt-BR |
dc.subject | Host defense responses | pt-BR |
dc.subject | Monographella albescens | pt-BR |
dc.subject | Oryza sativa | pt-BR |
dc.title | Microscopic aspects of silicon-mediated rice resistance to leaf scald | en |
dc.type | Artigo | pt-BR |