Document Type : Original Article
Authors
1
Assistant Professor, Crop and Horticultural Science Research Department, Golestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran
2
Associate Professor, Oil Crops Research Department, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
3
Assistant Professor, Oil Crops Research Department, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
10.22034/plant.2024.141534.1110
Abstract
In order to select drought-tolerant hybrids, 18 new sunflower hybrids with ZARIN cultivar were evaluated in a randomized complete block design in non-stressed and drought-stressed conditions in two experimental field stations (Gorgan and Gonbad) during 2021-2022 cropping season. Based on yield (seed yield and oil yield) in non-stress (Yp) and drought stress (Ys), various stress tolerance indices such as stress tolerance index (STI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HM), Stress susceptibility index (SSI) and tolerance index (TOL) were calculated. The results of combined analysis indicated that the environmental effect justified the largest percentage of all data variations. Correlation analysis between drought tolerance indices with non-stressed and drought-stressed yields showed that HM, MP, GMP and STI indices and especially STI index were recognized as the most suitable indices for selecting drought tolerant genotypes in sunflower. The correlation between oil yield under non-stressed and drought-stressed was significant at the 5% probability level. Three-dimensional diagrams based on STI index and yield in non-stress and drought stress conditions showed that H16, H10, H2, H4 and H1 hybrids had good performance in both non-stress and drought stress conditions and were selected as the most tolerant genotypes to drought stress. Therefore, these hybrids can be used for further testing, including adaptation tests in warm wet areas.
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