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Journal of Biological Sciences
  Year: 2007 | Volume: 7 | Issue: 2 | Page No.: 263-269
DOI: 10.3923/jbs.2007.263.269
Photosynthetic Contribution of the Inflorescence and Adjacent Green Tissue to Grain Yield in Four Safflower (Carthamus tinctorius L.) Genotypes under Diverse Environmental Conditions
Parviz Ehsanzadeh, Rouia Mahmoudieh and Nasrin Fareed

Abstract:
The hypothesis that grain yield per plant is to some extent proportional to the photosynthetic tissue of inflorescence and adjacent organs was tested on four safflower genotypes under two diverse field conditions, one in summer 2002 and the other in spring 2003. In each four-replicate RCBD field experiment the genotypes Arak 2811, Kouseh, Nebraska-10 and AC Sterling (K12 in 2003) were seeded at 3 m long plots, where each plot consisted five rows, spaced 45 cm apart with plants 7 cm apart on each row. Shading treatment, consisting unshaded control, inflorescence only and inflorescence along with its adjacent two leaves was applied on inflorescences of ten plants per plot from pollination to physiological maturity. Both levels of shading treatment led to significant decreases in 1000-seed weight, seed weight per inflorescence, seed number per inflorescence, seed yield per plant and harvest indices in both years. Averaged over genotypes, 14 and 36% decreases in seed yield per plant due to an imposed source limitation (i.e., the shading treatment) after inflorescence formation were observed in 2002 and 2003, respectively. The imposed source limitation led to 14 and 30% decreases in the safflower plants` harvest indices in 2002 and 2003, respectively, due, apparently, to a reduction in seed size, seed weight per inflorescence and seed yield per plant under the shading treatments. Further studies are recommended to determine the correlation between the photosynthetic area of the inflorescence and related organs of these genotypes with seed yield per plant under normal and stressful conditions and to determine the pattern of redistribution of the photoassimilates with different environmental conditions during safflower grain filling.
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How to cite this article:

Parviz Ehsanzadeh, Rouia Mahmoudieh and Nasrin Fareed , 2007. Photosynthetic Contribution of the Inflorescence and Adjacent Green Tissue to Grain Yield in Four Safflower (Carthamus tinctorius L.) Genotypes under Diverse Environmental Conditions. Journal of Biological Sciences, 7: 263-269.

DOI: 10.3923/jbs.2007.263.269

URL: https://scialert.net/abstract/?doi=jbs.2007.263.269

 
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