Document Type : Original Article
Authors
- Hamid Jabbari 1
- Gholam Abbas Akbari 2
- Nayer Azam Khosh Kholgh Sima 3
- Amir Hosein Shirani Rad 4
- Iraj Alahdadi 2
- Faezeh Tajodini 5
1 Assistant Professor, Oil Seed Research Department, Seed and Plant Improvement Institute, Karaj, Iran
2 Associate Professor, Department of Agronomy, College of Abureihan, University of Tehran, Tehran, Iran
3 Assistant Professor, Physiology and Molecular Research Department, Agricultural Biotechnology Research Institute, Karaj, Iran
4 Professor, Oil Seed Research Department, Seed and Plant Improvement Institute, Karaj, Iran
5 BS.c. Agronomy Student, Department of Agronomy, Shahr-e- Qods Branch, Islamic Azad University, Tehran, Iran
Abstract
In order to study the agronomic, physiologic and qualitative characteristics of canola (Brassica napus L.) under irrigation stress, an experiment was carried out as a randomized complete block design with three replications at the Research Field of Shahr-e- Qods Branch, Islamic Azad University, in 2010-2011 cropping season. In this experiment, the irrigation treatment had three levels including optimum irrigation over the growing period based on 80 mm evaporation from class A evaporation pan (control), irrigation cessation from flowering to physiological maturity, and irrigation cessation from silique formation until physiological maturity. The results indicated that the effect of irrigation treatment on plant height, stem diameter, branches per plant, relative water content (RWC), water saturation deficiency (WSD), Chl a and carotenoids, silique length, siliques per plant, 1000- seed weight, seed yield, seed oil content, oil yield, harvest index and productivity effort were significant. Irrigation cease from flowering and silique formation onwards decreased the RWC by 43.1 and 29.5%, Chl a by 32.7 and 26.5%, and carotenoid by 49.6 and 31.8% compared to normal irrigation (control treatment), respectively. In this study, normal irrigation (control) showed the greatest seed yield and seed yield was reduced from 2577 kg.ha-1 at control to 1483 and 1907 kg.ha-1 in irrigation cessation from flowering and silique formation onwards, respectively. Positive correlations were observed between seed yield and yield components, except seed number per silique and the greatest correlation occurred between seed yield and 1000- seed weight and silique per plant, respectively. Overall, these results showed that irrigation cessation from flowering until physiological maturity had more adverse impacts on physiological and morphological characteristics, seed yield and related traits compared to irrigation cease from silique formation to physiological maturity.
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