Registration of WS4U and WS8U switchgrass germplasms.(REGISTRATIONS OF GERMPLASMS)(University of Wisconsin, University of Nebraska, Agricultural Research Service and Lincoln)

Crop Science, March, 2006 by Beal, A.C.; Casler, M.D.; Vogel, K.P.

Two upland switchgrass (Panicum virgatum L.) germplasm pools, WS4U (Reg. no. GP-92, PI 639191) and WS8U (Reg. no. GP-93, PI 639192), were released cooperatively on 18 July 2002 by the University of Wisconsin, University of Nebraska, and the USDA-ARS, Lincoln, NE. These germplasms were developed as source material to be used in developing cultivars with increased biomass yield and geographic adaptation for bioenergy production in USDA hardiness zones 3 and 4 in the northern USA and similar geographic regions of southern Canada. WS4U is a tetraploid (2n = 4x = 36) and WS8U is an octoploid (2n = 8x = 72).

Spaced-plant nurseries were established at Arlington and Marshfield, WI, using switchgrass seedlings from 135 germplasm sources. Plant spacing was 0.9 by 0.9 m....

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