Study on trait relations of wheat genotypes using the Biplot method

Salinity stress is one of the major abiotic stresses in arid and semi-arid regions of the world, such as Iran. High genetic diversity for salinity tolerance has been observed in Iranian bread wheat genotypes. In this study to finding interrelationships between different traits and performance evaluation of wheat genotypes was used biplot method. In this study, 110 bread wheat genotypes were evaluated in two conditions (non-stress and saline stress) at the research field of the National Salinity Research Center (NSRC). The salinity of water used in irrigation in saline and non-stress conditions was 10 and 2 dS.m-1 respectively. The results revealed that there was a strong positive association between biological yield and harvest index with seed yield in both non-stress and saline conditions. Therefore, it seems that biological yield and harvest index could be used as a suitable criterion in selecting for increased seed yield in wheat in both non-saline and saline conditions. In this research among 110 studied bread wheat genotypes, promising advanced lines Salt22, Salt29 and Salt30 were identified as the most salinity-tolerant genotypes that these lines can be utilized for salt-affected areas and as donor parents in wheat breeding programs for further improvement of germplasm for salinity tolerance.