Physiological limiting factors of yield in different varieties of wheat, Triticum aestivum L., by changing source – sink relationships

Subject Areas : Agroecology Journal

Ali Reza Goharbari ¹ , davod Eradatmand Asli ² , mojtaba Usefirad ³

1 - M. Sc. Student of Agronomy Department, Islamic Azad University, Saveh Branch.
2 - Assistant Professor of Agronomy and Plant Breeding Department, Islamic Azad University, Saveh Branch.
3 - Scientific Board of Agronomy and Plant Breeding Department, Islamic Azad University, Saveh Branch.

Received: 2008-07-26 Accepted : 2009-08-16 Published : 2010-01-21

Keywords: Grain yield, Wheat, Flag leaf, Thinning, Source, Sink,

Abstract :

    In order to determine the physiological limiting factors of yield in different varieties of wheat, Triticum aestivum L., an experiment was conducted as split plot in a randomized complete block design with three replications in research farm of Islamic Azad university, Saveh branch in 2006-2007. Two large grain, Mahdavi, and small grain, Falat, wheat varieties were the main factors and removing flag leaf blade, removing three upper leaves, thinning of 50 percent of plants, removing of flag leaf blade and thinning of 50 percent of plants, removing of three upper leaves and thinning of 50 percent of plants and a control were considered as sub factors. The analysis of data showed that thinning of 50 percent of plants increased grain dry matter significantly in both cultivars. Removal of leaves decreased grain dry matter in Mahdavi cultivar more than Falat. Results showed positive reaction of small grain cultivar than large grain one in case of source  limitation.

References:

1-   امام، ی. 1386. زراعت غلات. مرکز نشر دانشگاهی شیراز، ایران، 200 ص.

2-  نادری، ا.1380. ارزیابی تنوع ژنتیکی و مدل‏سازی انتقال مجدد اسیمیلات‏ها و نیتروژن به دانه در ژنوتیب‏های گندم مناطق گرم جنوب ایران. رساله دکتری دانشگاه آزاد اسلامی واحد علوم و تحقیقات، 130 ص.

1. Alkio, M., Scnubert, A., Diepenbrock, W., and Grimm, E. 2003. Effect of source-sink ratio on seed set and filling in sunflower (Helianthus Annuus L.). Plant, Cell and Environment. 26: 1609-1619.


2. Cartelle, J., Pedro, A., Savin, R., and Slafer, G. A. 2006. Grain wheat responses to post-anthesis spikelet-thinning in an old and a modern wheat under mediterraniean conditions. European Journal of Agronomy 24: 365-371.


3. Cruz-Aguado, J. A., Rodes, R., Ortega, E., Perez, I. P., and Dorado, M. 2001. Partitioning and conversion of ¹⁴C-photoassimilates in developing grains of wheat plants grown under field conditions in Cuba . Field Crop Research 69: 191-199.


4. Duggan B. L., and Fowler, D. B. 2006. Yield structure and kernel potential of winter wheat on the Canadian prairies . Crop Science  46: 1479-1487.


5. Egli, D. B. 1999. Variation in leaf starch and sink limitations during seed filling in soybean. Crop Science39: 1361-1368.


6. Eradatmand Asli, D., Dua, I. S., and Mehrpanah, H. 2005. Source-sink manipulation and it’s effect on potential grain yield of rice (Oriza sativa L.). Panjab University Research Journal 55: 87-95.


7. Fischer, R. A., 1985. Number of kernels in wheat crops and the influence of solar radiation and temperature.Journal of Agricultural Science100: 447-461.


8. Gelang, J., Sellden, G., Younis, S., and Pleijel, H. 2001. Effects of ozone on biomass, non-structural carbohydrates and nitrogen in spring wheat with artificially manipulated source–sink ratio. Environmental and Experimental Botany 46: 155-169.


9. Laffite, H. R., and Travis, R. L. 1984. Photosynthesis and partitioning in closely related lines of rice exhibiting sink-source relationships. Crop Science 9: 85-96.


10. Ma, Y. Z., Mackown, C. T., and Vansanford, D. A. 1990. Sink manipulation in wheat: compensatory changes in kernel size. Crop Science30: 1099-1105.


11. Moot, D. J., Crampton, M. W., and Martin, R. J. 1998. Grain growth within oat panicles. Proceeding of the 9th Australian Agronomy Conference, Pp. 285.


12. Patrick, J. W. 1988. Assimilate partitioning in relation to crop productivity.Horticulture Science 23: 33-40.


13. Savin, R., and Slafer, G. A. 1991. Shading effects on the yield of an Argentinian wheat cultivars. Journal of Agricultural Science 116: 1-7.


14. Sharma, S. N., Sain, R. S., and Sharma, R. K. 2003. Genetic analysis of flag leaf area in durum wheat over environments. Wheat Information Service 96: 5-10.                                                                                


15. Slafer, G. A. 1994 . Genetic improvement of field crops. Marcel Dekker Inc, Pp. 150.


16. Thorne, G. N., and Wood, D. W. 1987. Effects of radiation and temperature on tiller survival, grain number and grain yield in winter wheat. Annals of Botany 59: 413-426.


17. Venkateswarlu, B., and Visperas, R. M. 1987. Source-sink relationship in crop plants. IRRIResearch Paper Series, 125.


18. Xu, J. L., Yu, S. B., Luo, L. J., Zhong, D. B., Mei, H. W., and Li, Z. K. 2004. Molecular dissection of the primary sink size and it’s related traits in rice. Plant Breeding 123: 43-50.


19. Yoshida, S., and Ahn, S. B. 1986. The accumulation process of carbohydrate in rice varieties to their response to nitrogen in tropics. Soil Science Plant Nutrient 14: 155-161.