How does water and salt stress affect the germination and initial growth of Brazilian soya bean cultivars? |
| |
| Authors: | Alan Mario Zuffo Fábio Steiner Tiago de Oliveira Sousa Jorge González Aguilera Paulo Eduardo Teodoro Francisco de Alcântara Neto Rafael Felippe Ratke |
| |
| Institution: | 1. Department of Crop Science, Federal University of Mato Grosso do Sul, Chapadão do Sul, MS, Brazil;2. Department of Crop Science, State University of Mato Grosso do Sul, Cassilândia, MS, Brazil;3. Department of Agriculture, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil;4. Department of Crop Science, Federal University of Piauí, Teresina, PI, Brazil |
| |
| Abstract: | The effects of water and salt stress on rate of germination and seedling growth were investigated under laboratory conditions in 46 soya bean genotypes from Central-West region of Brazil to verify how these stresses may limit crop establishment during the initial growth stage and also to identify the most tolerant genotypes to drought and salinity. Mild water and salt stresses were imposed by seed exposure to –0.20 MPa iso-osmotic solutions with polyethylene glycol—PEG 6000 (119.57 g/L) or NaCl (2.357 g/L) for 12 days at 25°C. The germination percentage, seedling length and seedling dry matter were measured, and then, salt or drought tolerance indexes were calculated. The “NS 5909 RG,” “NS 7000 IPRO,” “NS 7338IPRO,” “FPS Solimões RR,” “NS 5151 IPRO,” “SYN 13610 IPRO,” “LG 60177 IPRO,” “NS 6909 IPRO” and “BMX Desafio RR” were identified as the most drought-tolerant genotypes, whereas under salinity conditions, the genotypes “5D 615 RR,” “BMX Desafio RR,” “5D 6215 IPRO” and “BMX Ponta IPRO” were identified as tolerant. The “BMX Desafio RR” is the genotype most adapted to both stress conditions and, therefore, should be used under conditions of water shortage and excess salt in the soil at sowing time. |
| |
| Keywords: | drought Glycine max osmotic potential salinity tolerance index water deficit |
|
|
