Submitted to: Crop Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 3/31/2004
Publication Date: 9/1/2004
Citation: Mcphee, K.E., Muehlbauer, F.J. 2004. Registration of 'stirling' green dry pea. Crop Science. 44:1868. Interpretive Summary: 'Stirling' is a large-seeded green cotyledon dry pea (Pisum sativum L.) developed by the USDA-ARS and released in 2002 in cooperation with the Washington Agricultural Research Center, Pullman, WA; the Idaho Agricultural Experiment Station, Moscow, ID; the North Dakota Agricultural Experiment Station, Fargo, ND. Stirling was released based on improved lodging resistance, persistent green color of the seeds and significant yield increases over standard checks. Stirling originated as an F4 selection (PS610152) from the cross, 'Alaska 81'/3/PS810088/2/Alaska 81/'Radley' made in 1993. Alaska 81 has resistance to pea seed borne mosaic virus resistance and excellent seed quality. PS810088 is a green dry pea breeding line selected for adaptation and with resistance to powdery mildew caused by Erisyphe polygoni DC. Radley is a green cotyledon dry pea line with the af gene that converts normal leaflets to tendrils and the le gene that confers semi-dwarf plant stature. Stirling has a semi-dwarf growth habit reaching 60cm in length and has the recessive allele (af) for semi-leafless leaf morphology. Flowers are white and usually borne doubly on the peduncles beginning at the 14th node. Weight of 100 seeds averages 21.1 g, compared to 17.0 g for Columbian and the bright green seed color is durable in moist conditions with intense sunlight conducive to seed bleaching, a cause of serious quality impairment in green cotyledon dry peas. Stirling is resistant to race 1 of fusarium wilt and powdery mildew, but is susceptible to pea enation mosaic virus. The combination of lodging resistance and high yield potential is desired by US producers and the superior seed quality of Stirling is desired in domestic and international markets.
Technical Abstract: 'Stirling' green dry pea was developed and released based on its high yield potential, superior seed quality and lodging resistance. Seed of Stirling are resistant to seed bleach, a severe quality impairment in green dry peas and meet quality standards of traditional domestic and export markets. Resistance to lodging is the primary advantage of Stirling and allows producers to harvest the crop while leaving approximately six inches of stubble without the assistance of modified combine equipment. The ability to harvest the crop above the soil surface reduces the amount of foreign material including dirt clods, small stones and debris in the harvested crop which increases crop value and minimizes equipment damage. The erect canopy structure also reduces the incidence and severity of some foliar pathogens. The combination of high yield potential, bleach resistance and lodging resistance are desired by US producers and has not been previously available.