Evaluation of Influences of Drought Stress in Terminal Growth Duration on Yield and Yield Components of Different Spring Brassica oilseed Species

摘要

This study was conducted to investigate influences of drought stress in terminal growth duration on yield and yield components of spring canola, which is an oil seed plant. The experiment was conducted in RCBD with three replicates and in two conditions including: drought stress and control with nine cultivars of three different species during two successive seasons 2008-2009 and 2009-2010 in Experimental farm of Razavi Khorasan Agricultural and Natural Resources Research Centre (Mashhad- Iran). The results of combined analysis of variances showed that drought stress final plant height, seed yield, number of seeds per pod and number of lateral branches was significantly affected under water stress at 1% level and for number of pods per plant at 5% level, while the 1000 seeds weight was not significant affected. Comparing cultivars average yield showed that Hyola 401, Hyola 330 of Brassica napus, respectively with 3383.3 and 3345.8 kg/ha had maximum seed yield. Whereas, Lundrace and Bp. 18 of B. juncea with 1547.2 and 1630.5 kg/ha had minimum seed yield. In total, in this study cultivars of B. napus showed more resistance to drought stress in terminal growth duration in comparing with cultivars of B. rapa and B. juncea and had more yield.