Subscribe Now Subscribe Today
Science Alert
FOLLOW US:     Facebook     Twitter
Curve Top
Journal of Applied Sciences
  Year: 2010 | Volume: 10 | Issue: 7 | Page No.: 564-569
DOI: 10.3923/jas.2010.564.569
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail
Effect of Source-Sink Manipulation on Yield Components and Photosynthetic Characteristic of Wheat Cultivars (Triticum aestivum and T. durum L.)
E. Bijanzadeh and Y. Emam

To investigate the effect of source-sink manipulation on photosynthetic characteristics and yield components of wheat cultivars, a research was carried out in the greenhouse at the College of Agriculture, Shiraz University, Shiraz, Iran, during 2008-2009 growing season. Five wheat cultivars including Shiraz, Bahar, Pishtaz, Sistan (as bread wheat) and Yavaros (as durum wheat) were grown in 5 kg plastic pots. The source-sink manipulation treatments including defoliation of all leaves, defoliation of all leaves except the flag leaf, removal of 25% of spikelets and removal of 50% of spikelets were applied at anthesis. Results showed that number of grains per spike was significantly decreased by defoliation treatment in Shiraz, Bahar and Yavaros cultivars, so that in Shiraz and Bahar cultivars, source restriction reduced the number of grains per spike by 18.97 and 11.07%, respectively. In Shiraz cultivar, defoliation of all leaves decreased main stem grain yield by 40.75%, which demonstrated that Shiraz was very sensitive to source restriction. The little response of main shoot grain yield to defoliation in Pishtaz cultivar indicates high mobilization of photoassimilate from other parts of the crop to the grains. Under sink restriction conditions, wheat cultivars (except Pishtaz) had potential to increase their 100-grain weight; moreover, Pishtaz yield appeared to be more sink rather than source-limited. Removal of all leaves except the flag leaf at 8 and 18 DAA, in Pishtaz and Yavaros cultivars, had no significant effect on net photosynthesis rate (Pn) and in all cultivars except Pishtaz, sink restriction significantly decreased Pn rate. Further research, is recommended for improving our understanding on source-sink relationship in Iranian wheat cultivars.
PDF Fulltext XML References Citation Report Citation
  •    Effect of Defoliation and Drought Stress on Yield Components and Chlorophyll Content of Wheat
  •    Effects of Timing and Defoliation Intensity on Growth, Yield and Gas Exchange Rate of Wheat Grown under Well-Watered and Drought Conditions
How to cite this article:

E. Bijanzadeh and Y. Emam, 2010. Effect of Source-Sink Manipulation on Yield Components and Photosynthetic Characteristic of Wheat Cultivars (Triticum aestivum and T. durum L.). Journal of Applied Sciences, 10: 564-569.

DOI: 10.3923/jas.2010.564.569








Curve Bottom