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Physiological Responses of Rice Plants Supplied with Silicon to M onographella albescens Infection
Author(s) -
Tatagiba Sandro D.,
Rodrigues Fabrício A.,
Filippi Marta Cristina C.,
Silva Gisele B.,
Silva Leandro C.
Publication year - 2014
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12231
Subject(s) - biology , lignin , malondialdehyde , peroxidase , botany , nutrient , cultivar , horticulture , biochemistry , enzyme , oxidative stress , ecology
Abstract This study investigated the effect of silicon ( S i) on the resistance of rice plants of the cv. ‘Primavera’ cultivar that were grown in a nutrient solution with 0 (− S i) or 2 m m (+ S i) Si to leaf scald, which is caused by M onographella albescens . The leaf S i concentration increased in the + S i plants (4.8 decag/kg) compared to the − S i plants (0.9 decag/kg), contributing to a reduced expansion of the leaf scald lesions. The extent of the cellular damage that was caused by the oxidative burst in response to the infection by M . albescens was reduced in the + S i plants, as evidenced by the reduced concentration of malondialdehyde. Higher concentrations of total soluble phenolics and lignin‐thioglycolic acid derivatives and greater activities of peroxidases ( POX ), polyphenoloxidases ( PPO ), phenylalanine ammonia‐lyases ( PAL ) and lipoxygenases ( LOX ) in the leaves of the + S i plants also contributed to the increased rice resistance to leaf scald. In contrast, the activities of chitinases and β ‐1,3‐glucanases were higher in the leaves of the − S i plants probably due to the unlimited M . albescens growth in the leaf tissues, as indicated by the larger lesions. The results of this study highlight the potential of Si in decreasing the expansion of the leaf scald lesions concomitantly with the potentiation of phenolic and lignin production, and the greater activities of POX , PPO , PAL and LOX rather than simply acting only as a physical barrier to avoid M . albescens penetration.