Abstract
To assess the effects of drought stress and sowing date on phenological, morphological, and yield traits of three different cultivars of winter oilseed rape (Brassica napus L.), this study was conducted in research farm of Sarayan agricultural college- University of Birjand in 2016-2017 growing season. Experiment was conducted in a split-factorial based on the randomized complete block design with drought stress in the main plots and three sowing date (September 22, October 6, and October 22) along with three cultivars of canola (‘Homolious’, ‘Hayola50’, and ‘DK7070CL’) in the subplots in three replications. The results of analysis of variance and means comparison analysis showed significant and negative effect of drought stress on seed yield and biological yield traits of investigated cultivars of canola. The interaction effect of drought stress × sowing date × cultivar was only significant on leaf twisting trait at 1 % probability level. ‘Homolious’ was assigned as the most drought tolerance cultivar, based on SI, SSI, RDI, TOL, MP, STI, GMP, YI, YSI, and HARM drought tolerance indexes, whereas ‘Hayola50’ was assigned as most drought sensitive cultivar of oilseed rape.
Highlights
The growing populationof the world along withmore requests for vegetable oils leads to more cultivation of oil seed crops
Based on the results of analysis of variance, three ways interaction effect of drought stress × sowing date × cultivar was only significant for leaf twisting trait at 1 % probability level (Table 1)
These results indicate that the applied drought stress was not severe enough
Summary
The growing populationof the world along withmore requests for vegetable oils leads to more cultivation of oil seed crops. Winter oilseed rape (Brassica napus L.) is one of the most important oil seed crops that economically compete with cereal crops (Diepenbrock, 2000). Oilseed rape is the third source of vegetable oil in the world (USDA, 2016a). The yield stability of oilseed rape has not improved, beside its increased seed yield (Weymann et al, 2015). One of the main barriers to plant growth and yield is abiotic stress, especially the drought stress. Prolonged water deficit is a major abiotic stresses (Farooqet al., 2009)
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