Registration of ‘IdaGold’ Yellow Mustard

'IdaGold' yellow mustard (Sinapis alba L.) (Reg. no. CV-9, PI 597356) was developed for use as a condiment spice yellow mustard by the Idaho Agricultural Experiment Station. IdaGold is an open-pollinated cultivar selected for adaptation to dryland environments of the Pacific Northwest (Idaho, Oregon, and Washington). The cultivar was developed from a single plant selected in 1992 from an FS population derived from the cross 'MustangY'BHLG.3553'. The original cross was made in 1988 and the population was advanced to FS by completing four cycles of hand self pollination, without selection. Mustang is a high erucic acid (>450 g kg-') cultivar that originated in Svalov, Sweden, and BHLG.3553 is a low erucic acid (<50 g kg~') breeding line developed by Agriculture and Agri-Food Canada, Saskatoon, SK. Both parental lines have high glucosinolate (>250 (imol g") content in the seed meal. The original F6 population of IdaGold was selected in the field in 1992 and replicated field evaluation beginning in 1993. Performance of IdaGold was compared with the cultivars Gisilba, Tilney, and Ochre in field trials planted in Idaho, Washington, and Oregon in 1993 (5 locations), 1994 (6 locations), 1995 (7 locations), and 1996 (5 locations). Gisilba and Ochre were both developed at Saskatoon; Tilney was developed at Horticulture Research International, Wellesbourne, England. No yellow mustard cultivars have been released or developed in the USA, and these control cultivars have predominated the acreage in both the USA and Canada over the past 3 yr. Yield of IdaGold was consistently higher than control cultivars during the 4 yr of testing. Averaged over all locations, mean seed yield of IdaGold was 1785 kg ha-, compared 1600 kg ha" for Gisilba, 1580 kg ha" for Ochre, and 1564 kg ha" for Tilney. Compared with these three cultivars, IdaGold was the highestyielding entry at 11 of 23 year-sites and was ranked second highest at 9 year-sites. IdaGold has significantly higher (P < 0.05) total glucosinolate content (244 (xmol g") than Tilney (231.umol g-) and significantly (P < 0.05) lower total glucosinolates than Gisilba (257 umol g-)Sinalbin (p-hydroxybenzyl glucosinolate) accounted for the greatest proportion (97%) of total glucosinolate. IdaGold has a seed oil fatty acid profile of 280 g kg-' oleic acid, 320 g kgerucic acid, and 100 g kg" linolenic acid, which is not significantly different (P < 0.05) from either Gisilba or Tilney. Seedling emergence of IdaGold was not significantly different (P < 0.05) from the three control cultivars. IdaGold flowers 1 to 2 d later than Gisilba flowers. Plants are erect in habit and stems are hollow. Average plant height is 129 cm, compared with 121 cm for Gisilba and 133 cm for Ochre. Averaged over years and sites, mean oil content of IdaGold was 251 g kg ~ •, which was not significantly different (P < 0.05) from any of the three control cultivars. Average 1000-seed weight was 5.5 g and was not significantly different (P < 0.05) from Tilney. Seed color is bright yellow. Breeder seed was produced from the original selected Fe population grown in a breeder seed plot in 1996. Foundation seed was planted in 1997 from 800 single-plant selections taken from the 1996 breeder seed. U.S. plant variety protection of IdaGold is pending (PVP Certificate no. 9700374). Seed increases are limited to foundation and certified classes. Requests for seed of IdaGold for commercial production can be made to the Idaho Agricultural Experiment Station, University of Idaho, Moscow, ID 83844-2331. Small amounts of seed for experimental purposes will be available from the corresponding author for at least five years.