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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 655304 | EL55 | Beta vulgaris L. subsp. vulgaris | Michigan, United States | W6 | | | 2008 | DEVELOPED | PRE 2008 | | | | | Breeding material | EL55 is being released in the interest of improving seed quality and performance in sugar beet. From over 4,000 legacy seedlots produced between 1961 and 1989 stored in ambient (high humidity) conditions, only 523 emerged under field conditions at the Saginaw Valley Bean and Beet Farm in Saginaw, MI in 2000. Only 71 of these stored seedlots gave commercially adequate stands (ca. 50% of planted seed), however each of these good seedlots was produced after 1988. Roots from the 12 oldest seedlots (i.e. those stored the longest) were collected as mother roots, and seed was produced. Using an accelerated seed aging protocol, this seed demonstrated slightly improved seed longevity. The majority of this germplasm is derived from remnant seed generated during development of seed parents in the germplasm conversion to hybrid seed production conducted by George Hogaboam (USDA-ARS, deceased). Thus, this material is also expected to be useful for developing cytoplasmic male sterility (CMS) parents for hybrid seed production. Reasonable to high levels of Aphanomyces blackleg and Cercospora leaf spot resistances is present in this material, as is customary of traditional East Lansing ARS germplasm. | 1789738 | PI 655304 |
| 1 | PI 654357 | EL54 | Beta vulgaris L. subsp. vulgaris | Michigan, United States | W6 | | | 2008 | DEVELOPED | PRE 2008 | | | | | Breeding material | EL54 was developed at the Sugarbeet and Bean Research Unit in East Lansing, Michigan by J.M. McGrath. EL54 is released in the interest of broadening the genetic base of sugar beet. The parent accession WB879 was initially identified as resistant by C. Rush (Amarillo, TX) in the Sugarbeet Germplasm Committee s coordinated field trials in 1994 and reported as one of four accessions with very high resistance to Aphanomyces as judged by the lack of discoloration of hypocotyls. The introgression of this resistance into a sugar beet idiotype adapted to the humid Eastern U.S. growing regions was the desired outcome. EL54 has shown excellent Aphanomyces resistance in field trials in Michigan, Minnesota, and North Dakota. EL54 is expected to be a source for development of parental lines for hybrid cultivars resistant to Aphanomyces seedling damping-off as well as to mature root rot caused by Aphanomyces cochlioides Drechs. EL54 has shown a high degree of male sterility, and may be useful as an alternative source for deployment of cytoplasmic male sterility (CMS) for hybrid seed production. However, specific CMS maintainer lines have not yet been identified, nor has the cytoplasmic mitochondrial genome of WB879 been investigated. EL54 was increased in a 0.04 hectare plot in Oregon and harvested in four fractions (designated with a separate WC number); monogerm-male sterile (EL-A021485, WC050864), monogerm-male fertile (EL-A021484, WC050862), multigerm-male sterile (EL-A021481; WC050191), and multigerm-male fertile (EL-A021483, WC050860). This seed showed contamination (ca. 6%) with an unknown red chard-like pollinator. | 1780856 | PI 654357 |