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:: Volume 2, Issue 1 (Journal of Oil Plants Production 2015) ::
3 2015, 2(1): 85-97 Back to browse issues page
Effect of source and sink manipulation on photosynthesis rate and grain yield of sunflower (Helianthus annuus L.)
Seyed Abdolreza Kazemeini *, Fatemeh Sadeghi, Yahya Emam
of Crop production and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, Iran , kazemeini22@gmail.com
Abstract:   (3877 Views)

In order to evaluate the effect of different levels of defoliation and grain removal on grain yield and photosynthesis rate of sunflower, a factorial experiment was conducted based on randomized complete block design with three replications during 2012 growing season at College of Agriculture, Shiraz University. Treatments were defoliation at 3 levels (0, 50, and 75%) in heading stage and grain removal (without grain removal (control), removal of one half of the grains in inner or side parts) at pollination stage. It appeared that defoliation resulted in reduction of grain yield, 1000 grain weight and grain number. Apparently increased photosynthetic rates of reminder leaves may be considered a response to the reduction of leaf area however it did not generally sufficient to compensate the reduction of leaf area. The highest reduction of grain yield was recorded in 75% defoliation and removal of one-half of the grains in inner parts of head, compared to control. It can be concluded that grain yield of sunflower is more determined by limited source.

Keywords: Defoliation, Grain removal, Grain number, Sunflower capitulum
Full-Text [PDF 150 kb]   (426 Downloads)    
Type of Study: Research | Subject: General
Received: 2015/04/21 | Accepted: 2015/07/11 | Published: 2015/09/21
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Kazemeini S A, Sadeghi F, Emam Y. Effect of source and sink manipulation on photosynthesis rate and grain yield of sunflower (Helianthus annuus L.). 3. 2015; 2 (1) :85-97
URL: http://yujs.yu.ac.ir/jopp/article-1-48-en.html


Volume 2, Issue 1 (Journal of Oil Plants Production 2015) Back to browse issues page
سامانه نشریات دانشگاه یاسوج - مجله تولید گیاهان روغنی Journal of Oil Plants Production
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