Initial growth and sodium content in rice plants under salinity

• Autor(a) principal: Lemes, Elisa Souza
• Data de Publicação: 2018
• Outros Autores: Oliveira, Sandro de, Neves, Edinilson Henrique das, Ritter, Ronan, Mendonça, André Oliveira de, Meneghello, Geri Eduardo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista de Ciências Agrárias (Belém. Online)
• Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2764
• topic: Oryza sativa L.; Abiotic stress; Growth analysis; Tolerance; Oryza sativa L.; Estresse abiótico; Análise de crescimento; Tolerância

Growth analysis is an affordable, cheap, and accurate method to evaluate plant growth against different environmental and management conditions. In this sense, this study aimed to evaluate the effect of salinity on the initial growth and sodium accumulation in the plant tissue of two rice cultivars. The experimental model used was a completely randomized design, constituting a 2 x 2 factorial (BRS Bojuru and IRGA 417 cultivars; with and without salt stress) with five replications. One level of salinity (2.0 dS m-1) was used by the addition of sodium chloride solution, except for the control, which received only tap water. Plant height, the leaf area, shoot dry matter, and sodium content were assessed at 10, 20, 30, 40 and 50 days after emergence (DAE). For calculation of the growth rates [net assimilation rate (NAR), relative growth rate (RGR) and crop growth rate (CGR)] the periods of 10, 30 and 50 DAE were considered. Based on the results obtained, it is concluded that the salinity reduces plant height, leaf area, shoot dry matter, and increases the sodium content in the cultivars’ tissues. At the early growth, the BRS Bojuru cultivar in salt stress condition shows better response than IRGA 417 cultivar. The BRS Bojuru cultivar presents better RGR at 30-50 DAE in salinity condition. The NAR is not influenced by the salinity in the period of 30-50 DAE in both cultivars.