In order to evaluate the response of rapeseed cultivars to moisture regimes and correlation analysis in different growth stages, a field experiment was conducted in 2006-7 in seed and plant improvement institute of Karaj, Iran. Results showed that number of pods per plant, pod length, stem diameter, 1000-seed weight, oil seed content and branch numbers per plant were reduced significantly under water deficit stress. Also, grain yield was decreased more than biological yield and this resulted in decreased harvest index. Correlation coefficient analysis revealed that number of pods per plant, number of seeds per main and secondary pod, 1000-seed weight, pod length, biological yield and oil seed content had positive and significant correlation with seed yield. Stopping the irrigation from flowering stage also had undesirable effect on seed yield and its components. Among cultivars, Opera cultivar produced more seed yield (4053 kg ha-1) than the others under normal irrigation and under water deficit stress conditions, Zarfam cultivar had the maximum seed yield during stem elongation (3569 kg ha-1), flowering (2135 kg ha-1) and podding stages (2476 kg ha-1). Okapi had the least changes of oil content than other cultivars. Based on the result of this study can be concluded that Zarfam cultivar had better capability to tolerate drought stress and could produce greater seed yield under stress conditions
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机译：为了评估油菜品种对水分状况的响应以及不同生长阶段的相关性分析，2006-7年在伊朗卡拉伊种子和植物改良研究所进行了田间试验。结果表明，在水分亏缺胁迫下，每株植物的荚果数量，荚果长度，茎直径，1000粒重，油籽含量和单株枝数均明显减少。此外，谷物产量的下降幅度要大于生物学产量，这导致收成指数下降。相关系数分析表明，每株豆荚的数量，每个主荚和次荚的种子数量，1000粒重，荚果长度，生物产量和含油种子含量与种子产量成正相关关系。从开花期停止灌溉对种子产量及其组成部分也产生了不良影响。在正常灌溉和缺水胁迫条件下，Opera品种的种子产量（4053 kg ha-1）比其他品种多，Zarfam品种在茎伸长（3569 kg ha-1），开花（2135）期间具有最高的种子产量。 kg ha-1）和荚果阶段（2476 kg ha-1）。霍加api（Hokapi）的含油量变化比其他品种最少。根据这项研究的结果可以得出结论，Zarfam品种具有更好的抗旱能力，在胁迫条件下可以产生更高的种子产量
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