Registration of ‘WL 320’ Alfalfa

Abstract

REGISTRATION OF 'WL 605' ALFALFA 'WL 605' alfalfa (Medicago saliva L.) (Reg. no. 145) (PI 508281) was developed by W-L Research. It was tested under the experimental designation B-57 and released in September 1985. WL 605 is a 177-clone synthetic cultivar. Parental clones were selected following a cycle of recurrent phenotypic selection for resistance to the blue alfalfa aphid [Acyrthosiphon kondoi (Shinji)] and one cycle for tolerance to anthracnose (caused by Colletotrichum trifolii Bain.). The component populations had been screened previously for resistance to spotted alfalfa aphid [Therioaphis maculata (Buckton)], Phytophthora root rot (caused by Phytophthora megasperma Drechs. f. sp. medicaginis Kuan & Erwin), and Fusarium wilt [caused by Fusarium oxysporum Schlecht f. sp. medicaginis (Weimer) Snyd. & Hans.]. Source germplasm includes plants selected for resistance to downy mildew (caused by Peronospora trifoliorum d By.) within field plots of two WL experimental cultivars, plus germplasm tracing to 'CUF 101', 'Shiver', and three releases from the University of California, namely, UC 123, UC 143, and A77-10B. The fall dormancy of WL 605 is similar to that of CUF 101, It has high resistance to Phytophthora root rot (superior to MnPD-1), spotted alfalfa aphid (equal to PA-1), Fusarium wilt (equal to 'Moapa 69'), blue alfalfa aphid (superior to CUF 101), and pea aphid [Acyrthosiphon pisum (Harris)] (equal to PA-1); and moderate resistance to stem nematode [Ditylenchus dipsaci (Kuhn) Filipjev]. It is susceptible to anthracnose and bacterial wilt [caused by Corynebacterium insidiosum (McCull.) H.L. Jens.]. WL 605 is a very nondormant cultivar adapted for forage use in the southern USA, particularly in the southern portion of the southwestern region. The flower color is purple (100%) with occasional variants. One generation each of breeder seed (Syn 1), foundation (Syn 2), and certified (Syn 3) seed classes is recognized. Breeder seed was produced under cage isolation at Bakersfield, CA. Sufficient foundation seed was produced in the lower San Joaquin Valley, CA, for the life of the cultivar. A maximum of 3 and 5 harvest yr are permitted on fields producing foundation and certified seed, respectively. WL 605 was reviewed favorably in 1985 by the National Certified Alfalfa Variety Review Board. Seed of WL 605 must be sold by cultivar name only as a class of certified seed, under provisions of U.S. Plant Variety Certificate 8600042.

Registration of ‘OK 169’ Alfalfa

“…Parentage of OK 169 traces to 26 released cultivars and germplasms and 20 diverse unreleased experimental strains. The approximate contribution from the sources are ‘555’ (Woodward and Miller, 1989) (7.8%); ‘Cimarron’ (PVP 7900062) and OK 51 (Caddel et al, 1992b) (6.6% each); ‘OK 49’ (Caddel et al, 1992a) (5.3%); ‘630’ (North American Alfalfa Improvement Conference, 2000) and ‘655’ (3.9% each); ‘624’, ‘636’, ‘5432’ (Woodward et al, 1987), ‘Archer’, ‘DK 135’, ‘WL 320’ (Hanson et al, 1987b), and 6 strains (2.6% each); and ‘5364’ (Woodward et al, 1990), ‘Acclaim’, ‘Action’, ‘Apollo’ (Moutray, 1983), ‘Arc’ (Devine et al, 1975), ‘Crockett’ (PVP 8900278), ‘Dynasty’, ‘Edge’, ‘Good As Gold’, ‘Magnum+’, ‘Pro‐Cut’, ‘Riley’, ‘Southern Special’ (Hanson et al, 1987a), ‘Sure’, and 14 strains (1.3% each).…”

Registration of OK 206 and OK 207 Alfalfa Germplasms

“…OK 206 and OK 207 were developed by recurrent phenotypic selection for resistance to blue alfalfa aphids collected in Oklahoma. Parents of OK 206 and OK 207 included 7 to 16% each of the cultivars 5472 (Woodward et al, 1993), Aggressor (North American Alfalfa Improvement Conference, 2000), Apollo Supreme, Cimarron (PVP 7900062), Garst 630, Magnum III, and WL 320 (Hanson et al, 1987), and the germplasm OK 51 (Caddel et al, 1992). Parental cultivars of OK 206 also included Good As Gold (4%) and CUF 101 (17%) (Lehman et al, 1983).…”

Registration of OK 190 Alfalfa Germplasm

“…Source populations screened in the greenhouse for resistance to the blue alfalfa aphid, collected in Oklahoma prior to 1990 (Zarrabi et al, 1994), included ‘Aggressor’ (North American Alfalfa Improvement Conference, 2000), ‘Apollo Supreme’, ‘Arrow’, ‘Cimarron’ (Plant Variety Protection No. 7900092), ‘Cimarron VR’, ‘CUF 101’ (Lehman et al, 1983), ‘Garst 630’, ‘OK 169’ (Caddel et al, 2002), ‘WL 317’ (Kugler et al, 1991), ‘WL 320’ (Hanson et al, 1987), ‘WL 322 HQ’ (Huset et al, 1991), ‘555’ (Woodward and Miller, 1989), ‘5472’ (Woodward et al, 1993), and three experimental populations. Source material screened in the greenhouse for resistance to the spotted alfalfa aphid included Aggressor, Apollo Supreme, Arrow, ‘Baker’ (Kehr et al, 1978), Cimarron VR, CUF 101, ‘Good As Gold’, OK 169, WL 317, WL 320, WL 322 HQ, 555, and three experimental populations.…”