Registration of Two Improved Yellow‐Flowered Alfalfa Germplasms

Abstract

Journal of Plant Registrations, Vol. 1, No. 2, September 2007 131 IAMF101 and IAMF102, yellow-fl owered alfalfa [Medicago sativa subsp. falcata (L.) Arcang.] populations, were developed by the Raymond F. Baker Center for Plant Breeding at Iowa State University, Ames, IA and the U.S. Dairy Forage Research Center (USDA-ARS), Madison, WI. These populations were released by the Iowa State University Research Foundation in September 2006. IAMF101 is designated as Reg. No. GP-347 PI 643446 and IAMF102 is designated as Reg. No. GP-348 PI 643447 in the national plant germplasm system (NPGS). IAMF101 is a genetically broad based tetraploid (2n = 4x = 32) Medicago sativa subsp. falcata germplasm, and has pods that range from M. falcata (sickle-shaped) (~70%) to single coiled. IAMF101 was developed by two cycles of recurrent phenotypic selection for persistence, autumn regrowth, and vigor from a broad based, yellow-fl owered alfalfa germplasm collection. It was previously known by the name “IAFAL.” The parent plants were selected on 22 Sept. 1999 from a germplasm evaluation trial at the Iowa State University Agronomy and Agricultural Engineering Farm near Ames, IA that had been planted in spring 1997. Selection was based on yield performance, freedom from disease and insect pests, and autumn regrowth. The 36 selected parents of IAMF101 derived from the following sources (number of plants in parentheses): IA-3018 (Kehr, 1973) (3), PI 314092 (2), PI 315476 (2), PI 384507 (4), PI 494661 (2), PI 502441 (2), PI 502450 (2), PI 502453 (3), PI 505872 (1), PI 538985 (1), PI 538989 (1), PI 538993 (1), PI 538994 (2), PI 573175 (1), PI 631597 (4), PI 631806 (2), WISFAL (Bingham, 1993) (3). The experimental yellow-fl owered alfalfa population IA-3018 is an 11-clone synthetic of diverse origin developed at Iowa State University by C.P. Wilsie in the 1960s (Kehr, 1973). Parental plants were intercrossed by hand in the greenhouse at Ames, IA during the winter of 1999–2000 and equal quantities of seeds from each parent were bulked. Seeds were germinated in spring 2000 in the greenhouse, and approximately 1000 Registration of Two Improved Yellow-Flowered Alfalfa Germplasms