Research Notes : United States : The genus Glycine subgenus Glycine germplasm collection

The genus Glycine as currently delimited is divided into two subgenera Glycine and Soja. The subgenus Soja includes the soybean, G. max, and its annual wild counterpart, G. soja. The subgenus Glycine comprises seven wild perennial species

Research Notes : United States : Screening of the USDA soybean cultivar collection for slow and fast urease isozymes

Urease present in soybean seed is known to consist of two isozyme variants. These variants are referred to as electrophoretically fast or slow on polyacrylamide gels and are believed to be polymers of a single subunit (Buttery and Buzzell, 1971; Polacco and Havir, 1979). The slow variant, considered a hexamer, has been estimated at 480,000 daltons by Polacco and Havir (1979) and at 520,000 daltons by Buttery and Buzzell (1971)

Research Notes : United States : Screening of the USDA Glycine soja collection for urease variants

Two isozyme variants of seed urease are present in soybeans. These variants are referred to as electrophoretically fast and slow on polyacrylamide gels (Buttery and Buzzell, 1971; Polacco and Havir, 1979). Kloth and Hymowitz (1985) demonstrated that the urease isozymes are codominantly inherited. They assigned the gene symbol Eul-a to the slow-moving allele and Eul-b to the fast-moving allele

Research Notes: An allelism study of the inheritance of the lack of soybean lectin in five soybeain lines

Pull et al. (1978) found five soybean lines ( \u27Columbia\u27 , \u27Norredo\u27, \u27Sooty\u27, Tl02 and \u27Wilson-5\u27) lacking the 120,000 dalton seed lectin, also called soybean lectin (SB1) . Orf et al . (1978) established that the lack of SBL is inherited as a simple recessive, le le . The homozygous dominant (Le Le) and heterozygous (Le le) condition result in the presence of SBL

Research notes: Soybean linkage tests between two seed proteins and other characters

F2 linkage results between Ti and W1, Dt1 and EP are shown in Table 1. F2 linkage results between SP1 and W1, Dt1, EP and Le are shown in Table 2. In all cases the Chi-square values were calculated using contingency tables

Research Notes : Screening the USDA soybean germplasm collections for lines lacking the 120,000 dalton seed lectin

Pull et al. (1978b) screened 102 lines of soybeans [Glycine max (L.) Merr.] and found 5 lines lacking the 120,000 dalton seed lectin (\u27Columbia\u27, \u27Norredo\u27, \u27Sooty\u27, \u27T102\u27, and \u27Wilson-5\u27). The amount of soybean lectin (SBL) per g defatted meal and the amount of SBL content in soybean protein for the 102 lines tested also was published by Pull et al. (1978a). Orf et al. (1978) demonstrated, using polyacrylamide gel electrophoresis, that the presence of SBL is controlled by a single dominant gene designated Le. The homozygous recessive le le results in the lack of SBL

Research Notes : Phytoestrogens in wild perennial relatives of the soybean

A systematic survey of phenolic compounds in the leaves of species from the genus Glycine subgenus Glycine Willd. (Hymowitz and Newell, 1981) is currently in progress in this laboratory. Two phenolic compounds, genistin (genistein-7-glucoside) and coumestrol, have long been known to have estrogenic activity (Bickoff et al., 1969) and both compounds have been reported from annual species of the genus Glycine (Wada and Masataka, 1964; Walz, 1931). Coumestrol and genistin were isolated and identified from leaves of Glycine tabacina using the methods of Mabry et al. (1970)

Research Notes : United States : Hybridization in genus Glycine subgenus Glycine

Since the publication of Newell and Hymowitz (1983), we have obtained a considerable number of new intra-and interspecific hybrids in subgenus Glycine. Parents in the hybridization programs were selected based upon their differences in morphology, chromosome number, and the area of origin. These hybrids shown below are being studied cytogenetically

Research Notes : United States : The genomes of the genus Glycine

Based upon morphology, geographical distribution, isozyme studies and meiotic chromosome behavior in intra-and interspecific hybrids, we tentatively have assigned the following diploid (2n=40) genome designations to species in the genus Glycine

Research Notes: Soybean seed β-amylase variants

Hildebrand and Hymowitz (1980a) reported that two soybean genotypes were found that lack detectable seed a- amylase activity . The cultivar \u27Chestnut\u27 produces an inactive a- amylase protein, Span (Hildebrand and Hymowitz , 1980b) ; \u27Altona\u27 is a mixture of genotypes that have a a-amylase protein of normal activity (sp1b) or lack it entirely (sp1) (Hildebrand and Hymowitz , 1980b) . Chestnut was selected from \u27Habaro\u27 and introduced into the U.S. as PI 20,405 in 1906 from Kharbarovsk, USSR (Hymowitz et al ., 1977)