Registration of two cranberry Bean germplasm lines resistant to Bean common mosaic and necrosis potyviruses: USCR-7 and USCR-9. (Registrations Of Germplasm).
USCR-7 and USCR-9 possess the be-3 gene which conditions an immune (symptomless) reaction to all BCMV strains (US-1, US-7, US-5, NY-15, Russian, and NL-4 strains, respectively, of pathogroups 1, 2, 4, 5, 6, and 7 were tested), and all BCMNV strains (NL-8 D, NL-3 D and K, and NL-5, respectively, of pathogroups 3, 6a and 6b were tested). In addition, the hypostatic I gene which conditions resistance to BCMV was detected in USCR-7 by presence of the SCAR marker SW13 (Melotto et al., 1996).
Both lines exhibit upright determinate bush growth habit and good yield potential in both tropical and temperate environments. The lines were resistant to ashy stem blight [caused by Macrophomina phaseolina (Tassi) Goid.] and rust [caused by Uromyces appendiculatus (Pers.) Unger var. appendiculatus;syn. U. phaseoli] during epidemics in Puerto Rico. USCR-7 possesses the Co-1 gene for resistance to race 73 of anthracnose [caused by Colletotrichum lindemuthianum (Sacc. & Magn.) Lambs.-Scrib.]. USCR-9 was susceptible to anthracnose races 7 and 73. Conversely, USCR-9 exhibits moderate tolerance to curly top virus, whereas USCR-7 is susceptible.
USCR-7 is an [F.sub.6:9] bulk from the cross C92158/6/`Taylor Horticultural'*3/3/`Montcalm'//BRB-33/Montcalm. C92158 is a cranberry breeding line from Michigan State University with the I gene. Taylor Horticultural is a cranberry cultivar with good yield potential and canning quality. Montcalm, a dark red kidney, has the I gene, Co-1 gene for resistance to anthracnose, resistance to halo blight [caused by Pseudomonas syringae pv. phaseolicola (Burkholder) Young et al.], and excellent canning quality. BRB-33, a dark red bean from CIAT (Center for Tropical Agriculture, Call, Colombia), has the bc-3 gene derived from `Don Timoteo'. USCR-7 matured in 90 d, 4 d later than Taylor Horticultural, in 1999 field trials at Othello, WA. The average weight of 100 seeds was 53 g compared with 51 g for Taylor Horticultural, and the yield was 90% of Taylor Horticultural.
USCR-9 is an [F.sub.6:9] bulk from the cross C92161/6/C92158/5/ Taylor Horticultural*2/3/Montcalm//BRB-33/Montcalm. C92161 is a cranberry breeding line from Michigan State University with good yield potential. This line matured in 86 d as did Taylor Horticultural. Average weight of 100 seeds was 51 g and the yield was 82% of Taylor Horticultural.
These two lines will be most useful for incorporating immune resistance to BCMV and BCMNV into the cranberry market class. Limited quantities of seed of each release are available from the corresponding author. We ask that appropriate recognition of source be given when this germplasm contributes to the development of a new cultivar.
P.M. MIKLAS * AND J.D. KELLY
Melotto, M., L. Afanador, and J.D. Kelly. 1996. Development of a SCAR marker linked to the I gene in common bean. Genome 39:1216-1219.
P.N. Miklas, USDA-ARS, Veg. & Forage Crop Res. Unit, 24106 N. Bunn Rd., Prosser, WA 99350; J.D. Kelly, Dep. of Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824. Registration by CSSA. Accepted 31 Aug. 2001. * Corresponding author (pmiklas@ tricity.wsu.edu).