Agricultural and Biological Sciences Journal
Articles Information
Agricultural and Biological Sciences Journal, Vol.3, No.1, Feb. 2017, Pub. Date: Aug. 1, 2017
Evaluation of Yield and Drought Resistance Indices of Rice Cultivars
Pages: 1-6 Views: 637 Downloads: 144
[01] Biabani Abbas, Department of Plant Production, Faculty of Agriculture, Gonbad Kavous University, Gonbad - e - Kavous, Iran.
[02] Golesorkhy Mohammad, Department of Plant Production, Faculty of Agriculture, Gonbad Kavous University, Gonbad - e - Kavous, Iran.
[03] Sabouri Hosein, Department of Plant Production, Faculty of Agriculture, Gonbad Kavous University, Gonbad - e - Kavous, Iran.
[04] Azarnia Mohsen, Department of Plant Production, Faculty of Agriculture, Gonbad Kavous University, Gonbad - e - Kavous, Iran.
Drought is a wide-spread problem seriously effects on rice (Oryza sativa L.) production and quality, also it is becoming an increasingly problem in many regions of the world. The objective of this study was to evaluate the ability of several selection indices to identify drought resistant cultivars (Shiroudi, Domsiah (local variety), Koral, IR70358-84-1-1, IR70358-84-1-2, WAB56-125, and IR80357-B-B12-3) under a variety of environmental conditions. Seven rice cultivars differing in yield performance were grown in separate experiments under rain-fed (non-irrigated) and irrigated conditions at the Research Farm of Gonbad Kavous University in 2010. A split-plot design was used with three replications. In flooding condition irrigation was conducted until maturity while in the drought condition, irrigation was watered to 40 days after transplantation then irrigation was discontinued. For rice plants survival and continued growth in drought conditions, irrigation was conducted a 14-day interval. Sowing was done in April and seedling density was 200 seeds per square meter. Six selection indices including stress susceptibility index (SSI), stress tolerance index (STI), tolerance (TOL), mean productivity (MP), geometric mean productivity (GMP), and harmonic mean (HM) were calculated based on yield and yield component under drought-stressed and irrigated conditions. The results showed that MP, GMP, STI and HM indices for yield and yield components were more effective in both drought-stressed and irrigated conditions. Selection of superior cultivar based on indices can be different for yield component. It is concluded that grain yield and filled grain number traits can be used to select superior cultivar under non stress and stress conditions.
Drought, Grain Yield, Resistance Indices, Rice, Yield Component
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