Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 30, 2001
Publication Date: N/A
Interpretive Summary: 'Shawnee' yellow dry pea was developed and released based on its resistance to powdery mildew, excellent seed quality traits and high yields. The new variety is similar to other varieties in use for time to flower and mature. The resistance to powdery mildew is a distinct advantage because the disease is a problem in most years and causes harvesting delays. The mildew spores cause allergic reactions and respiratory stress. Quality of Shawnee is superior to currently used varieties. The large seed size of Shawnee is desired by markets in the U.S. and internationally.
Technical Abstract: 'Shawnee' is a large-seeded yellow-cotyledon dry pea (Pisum sativum L.) developed by the USDA-ARS in cooperation with the Washington Agricultural Research Center (Pullman, WA); and the Idaho Agricultural Experiment Station (Moscow, ID) and released in 1997. Shawnee was released based on its' large seed size and bright yellow seed color, and resistance to powdery mildew caused by Erysiphe polygoni DC. Shawnee originated as an F5 selection (PS010603) from a cross(X78127//WV341F/WA110-42) made in 1984. X78127 is backcross derivative of 'Latah' that was developed for resistance to pea seedborne mosaic virus (1). WV341F is a breeding line that was used as a source of resistance to powdery mildew and pea enation mosaic virus (PEMV). WA110-42 has a dwarf plant habit, exceptionally large yellow seeds and relatively high seed yields. When compared to Latah, Shawnee averaged 12 cm shorter, flowered an average of 2 d later and matured in 104 d, which was a similar maturity date as Latah and Umatilla. Shawnee has uniform large and round seeds (100 seeds weigh an average of 22.3 g, compared to 17.6 g for Latah and 21.2 g for Umatilla). The large seeds have yellow cotyledons and the seed coats are clear. The large seed size of Shawnee is desired by markets in the U.S. and internationally.