Role of Silicon and Salicylic Acid in the Mitigation of Nitrogen Deficiency Stress in Rice Plants

• Autor(a) principal: Deus, Angelica Cristina Fernandes [UNESP]
• Data de Publicação: 2020
• Outros Autores: Prado, Renato de Mello [UNESP], Alvarez, Rita de Cassia Felix, Oliveira, Raimundo Leonardo Lima de [UNESP], Felisberto, Guilherme [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/s12633-019-00195-5; http://hdl.handle.net/11449/196796
• topic: Carbon; Beneficial element; Foliar application; Lignin; Nutritional deficiency; Oryza sativa

Application of silicon (Si) and salicylic acid (SA) mitigates plant stress; however, this effect is not known under nitrogen (N) deficiency conditions in rice plants. The objective of the present study was to determine whether foliar application with a soluble form of Si and SA, individually or in combination, could mitigate N deficiency stress in rice plants. The treatments consisted of application of 3.45 g L-1 Si only (sprayed on the leaves), 4.5 mM SA only, a combination of both, and no application as control. Net CO2 assimilation rate, transpiration, lignin and carbon contents, C:N:P:Si stoichiometric ratio and grain yield were evaluated. Foliar application of Si combined with SA or isolated application of SA did not mitigate N deficiency stress in rice plants. However, silicon application increased rice yield by 18.6% in N-deficient conditions. Our results show that the beneficial effects of Si under nitrogen deficient conditions are related to the stoichiometry change in C with Si and increases of lignin synthesis.