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Response of six oilseed rape genotypes to water stress and hydrogel application
Abstract
agronomic and physiological study of six rape seed
One of the major issues with brassica oil seed production is the water requirement of the brassica crop. To address the problem, field experiments were conducted to evaluate the effect of potassium (K) and water deficiency levels on canola (Brassica napus L.). Analysis of the data revealed that application of K, irrigation and interactions between irrigation and cultivar (I x C), irrigation and potassium (I x K), potassium and cultivar (K x C), and irrigation and cultivar and potassium (I x C x K) had a significant (p < 0.05) effect on shoot proline content, relative water content, plant fresh weight and grain yield. Potassium application, irrigation and interaction between I x C, K x C, and I x C x K had a significant (p < 0.05) effect on shoot sugar content. Water deficiency increased shoot proline and sugar contents and decreased relative water content. Potassium application increased shoot proline level in a dose dependent manner. Minimum proline and sugar contents and maximum relative water content, plant fresh and dry weight and yield were obtained when 100% irrigation was applied. Maximum grain yield was obtained upon application of 100% irrigation in combination with 120 kg ha(-1) K.
This experiment was conducted in 2010 in order to survey effect of drought stress on proline, soluble carbohydrates, relative water content, concentration of potassium and sodium, electrolytes leakage and grain yield of spring rapeseed genotypes in research greenhouse of Yasouj University. The experiment was factorial based on completely randomized design with three replications. In this research different genotypes of spring canola (CR3189,CR3250, Kosa Kroko, Marnoo , Regent) and irrigation treatment consisted of three levels (irrigation after 10, 40 and 70% depletion soil moisture) were studied. Results showed that irrigation and variety interaction had a significant effect on all traits except potassium concentration. Comparison of treatments showed that in all genotypes due to drought stress, proline, soluble carbohydrates, sodium ion concentration and electrolyte leakage increased but potassium concentration, relative water content and grain yield decreased. Among the genotypes in all three levels of irrigation maximum grain yield, proline, potassium and relative water content was related to the Kosa cultivar. Regent cultivar had the lowest potassium, proline, relative water content and grain yield and also had the highest electrolytes leakage and sodium. Overall, based on the results between the genotypes studied, Kosa and Regent varieties were identified tolerant and susceptible cultivars to drought stress respectively.
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