Assessment of Drought Tolerance in New Rapeseed (Brassica napus L.) Cultivars
Water deficit is one of the most important factors limiting a plant's growth and its production. The best way to fight drought is by applying appropriate agricultural operations and using plant cultivars that are more drought tolerant. An experiment was carried out in the Karaj Region of Iran for two years (2008–2009 and 2009–2010 cropping seasons) in order to evaluate drought stress tolerance in new Rapeseed cultivars. Irrigation, as the main factor, was conducted at two levels, including normal irrigation (irrigation from 80 mm evaporation from class “A” pan) and drought tension (non-irrigated from pod formation stage). The cultivar as the sub factor consisting of 23 new rapeseed cultivars at 23 levels was considered. The simple effect of irrigation and the interaction effect of irrigation by cultivar on grain yield at the 5% level and the simple effect of cultivar on this trait at the 1% level were significant. The Vectra cultivar under normal irrigation conditions and Hyola 401 Hybrid in non-irrigated from pod formation stage condition resulted in the maximum and minimum grain yields, respectively. However, the Elvis cultivar under normal irrigation conditions showed the highest oil yield. In addition, under both irrigation conditions, the Vectra cultivar and Elvis cultivar resulted in the maximum grain yield and highest oil yields, respectively. Simple correlation between the experiment traits indicated that there was a highly significant positive relationship between grain yield and oil content, oil yield, and harvest index.
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Document Type: Research Article
Publication date: December 1, 2013
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