|THEURER, J. - RETIRED ARS SCIENTIST
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/1/2001
Publication Date: 1/26/2000
Interpretive Summary: Beet sugar could be produced more economically if beetroots were able to be harvested with less soil, because of reduced post-harvest sugar losses in pile storage as well as lower costs for disposal of excess soil by processing companies. This new sugarbeet has a soil-free root and a higher sugar content than conventional sugarbeet, and should contribute to hybrid varieties of the future. The cost efficiencies resulting from smooth root sugarbeet will be essential to ensure profitability for sugarbeet farmers and processors.
Technical Abstract: SR95 is a highly smoothroot sugarbeet selected for soil-free harvest. It has root smoothness equivalent to SR87 released in 1990, but 6-7% higher sugar content. SR95 has smoother roots than SR94 which was released earlier from related parentage. SR95 resulted from two successive open-pollination increases of half-sib seed produced on a single mother beet selected for extreme root smoothness from the population that later was released as SR94. That single mother beet had been open-pollinated by seven other beets mass-selected for elite root smoothness and conical shape. Each of the seven beets stemmed from different complex but related parentages that as a group combined high sucrose germplasms L19, C40 and C51, curly-top- resistant L35cms and L53, and smoothroot germplasms SP85700-0, SP85131-0 and SP8530-0 from the former USDA-ARS breeding program of G.E. Coe at Beltsville. L19, C40, C51 and SP85700 also comprise most of the parentage of SR94. C40 (8400040) and C51 (8400051) are high sucrose percentage line kindly provided by Crystal-Maribo Seeds. L19, L35cms and L53 were developed for the intermountain region by the former USDA-ARS breeding program at Logan UT. SR95 is diploid, multigerm, and segregates for red (92%) and green (8%) hypocotyl color. SR95 is relatively easy bolting, and male- fertile plants are largely self-sterile with significant pseudo-self- fertility of individual plants. Male-sterility exceeds thirty percent, and is thought to be nuclear-cytoplasmic and derived from L19.