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United States Department of Agriculture

Agricultural Research Service

Research Project: Commercialization of New Industrial Crop Germplasm and Cropping Systems

Location: Plant Physiology and Genetics Research

Title: Response of spring type wheat (triticum aestivum l.) cultivars to different chilling treatments

Authors
item Ahmad, Muhammad -
item Razzaq, Abdur -
item Ashraf, Muhammad -
item Qayyum, Abdul -
item Jenks, Matthew

Submitted to: African Journal of Biotechnology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 12, 2011
Publication Date: November 21, 2011
Citation: Ahmad, M., Razzaq, A., Ashraf, M., Qayyum, A., Jenks, M.A., 2011. Response of spring type wheat (triticum aestivum l.) cultivars to different chilling treatments. African Journal of Biotechnology, Vol. 10(73), pp. 16541-16547.

Interpretive Summary: Late autumn sowing of wheat due to poor environmental conditions or late harvesting of cotton crop can result in substantial yield loss in wheat, and this has been attributed to inability of the wheat to obtain necessary chilling requirements for optimal growth. This study was conducted to identify the chilling requirement of autumn sown cultivars of wheat. The chilling requirements of seven wheat cultivars (five Pakistani and two American) were examined by exposing the seedlings to 6°C over periods of time from 7 to 35 days. The results of the experiment revealed that heading time and grain yield of all spring type wheat cultivars is affected by chilling treatments. It is suggested that in the arid zones of Pakistan considered, cultivars designated GA-02, Inqilab-91, Chakwal-50 and Fareed-06 must be sown in mid December while Sehar-06 can be sown in the start of January to meet their chilling requirement under field conditions without substantial yield reduction.

Technical Abstract: Late sowing of wheat in autumn due to environmental conditions or late harvesting of cotton crop results in substantial yield loss. It may be attributed to non-fulfillment of chilling requirements. The present study was conducted to identify the chilling requirement of autumn sown cultivars of wheat. Effect of chilling treatment (measured in vernalization days (VDs)) on seven wheat cultivars (five Pakistani and two American) was observed by exposing the seedlings to 6°C for 7, 14, 21, 28 and 35 days that is 6.72, 13.44,20.16, 26.86 and 33.60 VDs. Seedlings which acted as control were not subjected to chilling treatment. All spring type wheat cultivars headed irrespective of their chilling treatment but increase in VDs, enhanced days to heading. Winter type wheat “Caldwell” did not show heading which indicated its high VDs requirement. Chilling treatment also affected grain yield of all cultivars. Sehar-06 and Marquillo demonstrated highest yields at 6.72 VDs while GA-02, Inqilab-91, Chakwal-50 and Freed-06 manifested highest yields at 13.44 VDs. The results of the experiment revealed that heading time and grain yield of all spring type wheat cultivars is affected by chilling treatments. Depending upon the response of the cultivars and available VDs calculated from temperature data of last 20 years. It is suggested that GA-02, Inqilab-91, Chakwal-50 and Fareed-06 must be sown in mid December while Sehar-06 can be sown in the start of January to meet their chilling requirement under field conditions without substantial yield reduction.

Last Modified: 9/29/2014
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