Evaluation of Rice Genotypes from Crossing based on Salinity Stress Tolerance Indices

Salinity stress is one of the most important abiotic stresses that restricts the growth of crops. In order to group the rice genotypes resulting from crossing of improved cultivars at salinity stress conditions, a factorial experiment was conducted in a randomized complete block design with three replications under greenhouse conditions at Sari agricultural sciences and Natural Resources University in 2018. The treatments in the experiment included salinity stress factor at three levels (control, 4 and 8 dS/m) and nine rice genotypes. The different genotypes were grouped based on stress tolerance indices. The results showed that salinity stress reduced grain yield in all genotypes. The highest reduction in grain yield was related to salinity of 8 dS/m in all genotypes. Cluster analysis showed that a good variation between the studied genotypes in terms of stress tolerance indices at the salinity of 4 and 8 dS/m. Based on the results of tolerance indices the Jelodar × Danesh genotype had the highest value in terms of tolerance indices in both salinity conditions of 4 and 8 dS/m and was recognized as a tolerant genotype. Also, the genotype Danesh × Parto, in salinity of 4 dS/m and Danesh genotype in salinity of 8 dS/m, were known as susceptible genotype.