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GERMPLASM

Registration of Spring Wheat Germplasm TC 67 Resistant to Fusarium Head Blight

Eastern Cereal and Oilseed Research Center, Agriculture and Agri-Food Canada, 960 Carlling Ave., Ottawa, ON Canada K1A 0C6

^* Corresponding author (fedakga{at}agr.gc.ca).

ABSTRACT

TC 67 red spring wheat (Triticum aestivum L.) (Reg. No. GP-856, PI 654367) was developed at the Cereal and Oilseed Research Center, Agriculture and Agri-Food Canada. TC 67 was derived from the cross Crocus*2/PI343447 (T. timopheevii Zhuk). A segregating population of 1500 BC₁F₂ plants was established and advanced to F₇, using single seed descent. One hundred lines were selected from 535 BC₁F₇ lines, on the basis of plant fertility and agronomic traits, and evaluated for reaction to Fusarium head blight (FHB; caused by Fusarium graminearum) for two seasons. TC 67 had high levels of resistance to FHB that was comparable to that of ‘Sumai 3’, the most FHB resistant wheat available, based on point inoculation. The resistance of TC 67 to FHB was further evaluated in replicated field trials, compared with two resistant wheat lines, Sumai 3 and ‘HY 644’, in a FHB disease nursery in 2003 and 2004. The results show that TC 67 was significantly better than HY 644 in FHB incidence, severity, and Fusarium-damaged kernels and was comparable to Sumai 3 in deoxynivalenol content in the grain.

Abbreviations: DON, deoxynivalenol • FHB, Fusarium head blight • SSD, single seed descent