Registration of 'Promontory' Wheat

'Promontory' (Triticum aestivum L.) (Reg. no. CV- 798 ,PI555458) is a hard red winter wheat developed by the Utah Agricultural Experiment Station (UAES) and released in 1991. Promontory, tested under the designation UT1567-51, was released to provide superior yield and test weight in low moisture areas infested with dwarf smut (caused by Tilletia controversa Kühn in Rabenh). Promontory was derived from the cross 'Manning'/'Bezostaya-1'. The F₂ through F₅ generations were grown as bulks with some selection for agronomic types and screening for common bunt (caused by Tilletia caries (DC.) Tul & C. Tul.) resistance. Two individual heads from desirable F₅ plants were selected and planted as head rows in a dwarf smut selection nursery in Logan and in a head row nursery at the Bluecreek Experimental Farm, Bluecreek, UT. The resulting agronomically desirable F₅-derived lines, resistant to dwarf smut, were evaluated for yield, continued resistance to dwarf smut, and other agronomic traits in a preliminary unreplicated nursery at Blue Creek and in the dwarf smut nursery at Logan in 1985. Samples from the preliminary nursery and all subsequent nurseries were sent to Pillsbury Mills in Ogden, UT for milling and baking analysis. Selection continued in replicated yield trials throughout the state. UT1567-51 was evaluated in the state county yield evaluation nurseries from 1986 to 1989. It was evaluated in the Western Hard Red Regional Winter Wheat Nursery in 1987 through 1989. In 1988, 100 heads were selected from F_5:10 plants and grown as head rows. After roguing off-type and non-uniform rows, the remaining 82 F₁₀-derived lines were harvested and bulked as breeder seed.

Promontory is an awned, bronze-chaffed, medium-height wheat. The coleoptile is white, and juvenile growth is semi-erect. Promontory is about 1 cm shorter and 3 d earlier, and with darker bronze chaff color at maturity, than Manning.. Internodes of Promontory are hollow and the flag leaf is erect. At the boot growth stage, plants are blue green. The head is more lax than Manning, with glumes of medium length and width. The seed is ovate, with medium length brush and a medium wide and medium deep seed crease. Milling and breadmaking characteristics of Promontory are acceptable and are similar to Manning, although Promontory has a slightly weaker dough. Promontory is highly resistant to dwarf smut, and its resistance is derived from PI178383 and 'Ridit', two parents of Manning (1). . It generally produces 60-120 kg ha^-1 higher yields than Manning in Utah, and is 12 to 25 kg m^-3 heavier in volume weight than Manning.

Promontory has not been protected under the Plant Variety Protection Act. Breeder seed of Promontory will be maintained by the Utah Agricultural Experiment Station, Logan, UT 84322-4820.

D. J. Hole*, W. Dewey, and R. S. Albrechtsen (2)

References and Notes

1. Dewey, W. G. 1981. Registration of 'Manning' wheat. Crop Sci. 21:636.

2. Dept. of Plants, Soils, and Biometeorology, Utah State University, Logan, UT 84322-4820. Contribution of the Utah Agric. Exp. Stn., Journal Paper No. 4642. Registration by CSSA Accepted 30 Sept. 1994. *Corresponding author (Email: dhole@mendel.usu.edu.

Published in Crop Sci. 35:1206-1207 (1995)