doiSerbia

Drought stress effects on the grain yield among different barley cultivars

Arshadi Aram (Razi University, Campus of Agriculture and Natural Resources, Department of Plant Breeding, Kermanshah, Iran)
Karami Ezzat (Islamic Azad University, Sanandaj, College of Agriculture and Natural Resources, Department of Agronomy and Plant Breeding, Sanandaj Branch, Kurdistan, Iran)
Khateri Behzad (Islamic Azad University, Maragheh Branch, Department of Biotechnology, Maragheh, Iran)
Rezabakhsh Payam (Islamic Azad University, Mahabad Branch, Department of Agroecology, Mahabad, Iran)

We examined commercial barley cultivars in two sequential growing season by including irrigation and rainfed conditions under a randomized complete block experimental design. There were positive and significant correlations between the yeild and either of the indices including Mean productivity (MP), Stress Tolerance Index (STI), Geometric Mean Productivity (GMP), Harmonic Mean Productivity (HMP), and Mean Relative Performance (MRP) in both irrigated and drought conditions. The PC1 and PC2 justified 94.86 and 94.44% of total variation in the first year and second year, respectively. According to 3-dimensional diagram and based on STI, genotypes 2, 3, and 8 in the first year and gentypes 4, 3, 8, and 2 in the second year were clustered together in group A, and therefore, called the most tolerant cultivars to drought stress.

Keywords: barley, biplot, drought stress, drought tolerance indices