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CROP BREEDING, GENETICS & CYTOLOGY-NOTE

Estimating Out-Crossing Rates in Spring Wheat Cultivars Using the Contact Method

Dep. of Plant Sciences and Crop Development Centre, Univ. of Saskatchewan, 51 Campus Dr., Saskatoon, SK, Canada S7N 5A8

^* Corresponding author (hucl{at}sask.usask.ca)

Wheat (Triticum aestivum L.) is a self-pollinated species with out-crossing (OC) rates assumed to be less than 1%. The objective of this study was to evaluate the OC rates for 35 Canadian spring wheat cultivars grown under greenhouse conditions. Recipient cultivars were crossed with Purendo-38, a blue aleurone wheat, using direct spike contact inside glassine bags. Four seeding dates were used in each of two greenhouse experiments (2001 and 2002). Out-crossing rates ranged from 0 to 2.8% (2001) and 0 to 3.5% (2002), with the exception of ‘Glenlea’ and ‘Wildcat’. Only Glenlea (10.6% [2001]; 8.6% [2002]) and Wildcat (6.3% [2001]; 4.2% [2002]) displayed consistently elevated levels of OC.

Abbreviations: CPS, Canada Prairie Spring • CWAD, Canada Western Amber Durum • CWES, Canada Western Extra Strong • CWRS, Canada Western Red Spring • OC, out-crossing

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