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:: Volume 12, Issue 4 (1-2011) ::
علوم زراعی 2011, 12(4): 377-391 Back to browse issues page
Effect of water stress and foliar micronutrient application on physiological cahracteristics and nutrient uptake in sunflower (Helianthus annus L.)
Abstract:   (4568 Views)
To study the effect of foliar micronutrient application under water stress conditions at two stages of growth on chlorophyll fluorescence, chlorophyll, proline and carbohydrates content, nutrient uptake and relation between them with grain yield of sunflower (cv. Alster), a field experimental in split plot design with three replications was conducted at the University of Zabol, in 2007 growing season.. Wter stress at three levels (control, flowering and grain filling stages) were assigned as main plots and seven micronutrient treatments Fe, Zn, Mn, Fe+Zn, Fe+Mn, Zn+Mn and Fe+Zn+Mn, were randomized in sub-plots. Results showed that water stress at two stages of growth significantly reduced grain yield. The impact of water stress was more pronounced when applied at grain filling and grain yield decreased by about %24.3. Foliar micronutrient application increased grain yield in water stress and application of Mn had the highest positive effect on grain yield. Chlorophyll fluorescence, free proline and total soluble carbohydrates content increased in water stress condition at both stages of growth. The highest concentration of these components were found in the flowering stage. Foliar application of micronutrients increased accumulation of these components, the highest chlorophyll fluorescence was found in Fe, chlorophyll in Fe+Mn, proline in Zn and carbohydrate in Fe+Zn+Mn treatments. In this study, the highest content of Fe and Mn elements were found in non-water stress (control) and the lowest of these elemnets were observed in water stress at the grain filling stage. It can be concluded that water stress at the grain filling stage had the most effect on reducing grain yield of sunflower. Although the highest chlorophyll fluorescence and concentrations of the osmotic regulators (carbohydrates and proline) were found in water stress at the flowering stage. Since water stress at the grain filling stage reduced the uptake of micronutrients, particularly Mn, therefore its effect on sunflower was more pronounced than water stress at the flowering stage.
Keywords: Water stress, Micronutrient, Physiological caharcteristics, Osmotic adjustment and Sunflower
Full-Text [PDF 397 kb]   (3869 Downloads)    
Type of Study: Scientific & Research | Subject: Special
Received: 2015/02/22 | Accepted: 2015/02/22 | Published: 2015/02/22
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Effect of water stress and foliar micronutrient application on physiological cahracteristics and nutrient uptake in sunflower (Helianthus annus L.). علوم زراعی 2011; 12 (4) :377-391
URL: http://agrobreedjournal.ir/article-1-155-en.html


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Volume 12, Issue 4 (1-2011) Back to browse issues page
نشریه علوم زراعی ایران Iranian Journal of Crop Sciences
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