Detection of quantitative genes controlling of metabolic in rice seedling under salinity stress

Rice is one of the most important cereal and salinity is a major limitation in the development of rice cultivation. Genetically improving salt tolerance of rice is a highly important objective of rice breeding programs. This study was conducted to evaluate 96 lines F8 derived from Ahlemi Tarom (salt-tolerant) and Neda (salt-sensitive) to salinity stress in hydroponic in the Faculty of Agriculture, Gonbad Kavous University in 2015. Genetic linkage maps were prepared using 30 SSR markers and 15 ISSR markers covering 1411.3 cM from the rice genome. The average distance between two adjacent markers was 15.34 cM. For genotyping code, a QTL was detected on chromosome 7, justified 9.3% of phenotypic changes in the trait. For starch content, a gene locus was identified on chromosome 4, which had a LOD of 2.799. The additive effect of this QTL was 6.756 and justified, 12.6% of the phenotypic changes in this trait. For the phenol content, a gene location was detected on chromosome 7, which explained 15.2% of the phenotypic variance of the trait, and had LOD and additive effect of 2.728 and 3.4338, respectively. The alleles of the parents of Ahlemi-Tarom increased phenol content. One QTL was detected on chromosome 5, with an LOD of 2.2 for chlorophyll content. This QTL had additive effect and R2 of 0.097 and 9.2, respectively. The results of this study can identify the better genotypes in term of studied traits for marker selection programs.