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Urmia University
Abstract:   (52 Views)

In order to evaluate the genetic diversity of oily sunflower lines, screening drought tolerance indices and identification of drought tolerant lines, 100 lines of oily sunflower were evaluated in a simple lattice design under both well-watered and water-limited stressed conditions in 2016. Based on the potential (Yp) and stress (Ys) yield, quantitative drought tolerance criteria such as: mean productivity (MP), tolerance index (TOL), geometric mean productivity (GMP), harmonic mean (HM), stress susceptibility index (SSI) and stress tolerance index (STI) were calculated. Generally, the line with code number of 8 with average yield of 81.25 gr/plant and line 66 with average yield of 5.43 g/plant showed the maximum and the minimum seed yield, respectively. Correlation analysis between drought tolerance indices with well-watered and water-limited stress yields revealed that indices such as MP, GMP, HM and STI are the most suitable criteria for screening sunflower lines. In well-watered and water-limited stressed conditions, the highest value of MP, GMP, STI and HM were possessed to line 8. Regarding to these four criteria and high values of Yp and Ys, line 8 was chosen as a best line for using as a parental line in hybrid varieties production and development of segregating populations.

Type of Study: Research | Subject: Special

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