Forty soybean cultivars were received from the Peoples Republic of China in a number of exchanges between June 1973 and June 1974. The first eight cultivars that we received were grown in row tests at Harrow, Woodslee and Ridgetown in 1975, along with 'Harlen,
Bernard (1972) studied a gene, Dt2, which hastened the termination of apical stem growth and decreased both plant height and number of nodes per plant. In a 'Harosoy
F2 linkage results are presented in Table 1 with a= XY, b = Xy, c = xY, and d = xy for the gene pairs listed in the form of Xx and Yy. Percentage recombination was obtained as previously (Buzzell, 1974). As reported previously (Buzzell, 1975), the T31 that I am using appeared to carry 1n in contrast to the Ln T31 used by Weiss (1970).
Introduction: Since Brillmayr (1929) published his first report on soybeans, there has been almost no intensive research on it in Austria. Its cultivation dropped gradually and then ceased completely after World War II, due to the increased import of American soybean products and the difficulty in producing varieties which suit Austrian conditions. In 1970, the Institute of...
Pigments were extracted from self-colored soybean seedcoats and subjected to standard procedures of paper chromatography. This research was a part of a Master's Thesis problem conducted by Barksdale Taylor on genetic and chemical evaluation of hilum variants in mature soybean seed. Brown, reddish brown and buff seedcoats did not contain anthocyanin pigments.
By R. L. Bernard, R. I. Buzzel, R. L. Cooper, et al., Published on 04/01/76
By Soybean Genetics Newsletter, Published on 04/01/75
By Soybean Genetics Newsletter, Published on 04/01/75
By Soybean Genetics Newsletter, Published on 04/01/75
Regeneration of whole plants from cell cultures has been a primary objective . Several cultivars cultured in a liquid medium (Miller, 1965) with 0.5 mg/liter IAA and kinetin and 1.0 mg/liter 2, 4-D have developed compact spherical structures , 0. 5 to 2.0 mm in diameter, composed of vascular elements enclosed in a compact sheath of parenchyma cells. These structures readily...
Segregation for male sterility was observed in an F3 row from the cross of L67-533 (Clark-S, short internode) x SRF300 at Urbana, Illinois in 1971. The observed segregation was 63 fertile: 21 sterile (expected 63:21, 50 assuming sterility controlled by a single recessive gene). This hypothesis was confirmed in 1972, when, totaled over 49 segregating rows, the observed segregation...
Bernard (1971) reported on two major genes, E1 and E2, that affect the time of flowering and maturity of soybeans. Buzzell (1971) reported another maturity gene, E3; the recessive allele did not respond to fluorescent-daylength treatment. Kilen and Hartwig (1971) reported a recessive gene for a similar character in southern varieties.
Chief', a very tall Maturity Group IV variety, was used as a donor parent in backcrossing to 'Clark
Extending number of days to first bloom is a positive means for increasing total growth for short-season, determinate growth habit soybeans . Increasing number of days to first bloom is also effective in increasing the height of lowest pods. In an attempt to develop productive strains of Group IV maturity with good quality seed, we used PI 171.450 as a parent.
In screening experiments** to determine resistance of several commercial as well as introduced soybean germplasms, it was observed that European corn borer (Ostrinia nubilalis - Hbn), which is a major pest of sweet and field corn, was also infesting soybeans towards the end of the growing season in 1974. Generally the soybeans which were planted late (later than first week of...
Some mutants and mutation-derived lines of 'S.J.2
The male-sterile (female-fertile) mutant ms1 is identified by three characteristic features. Kenworthy et al. (1973) reported occurrence of twin seedlings, at a low frequency. We are reporting the two additional characteristics: failure of cytokinesis following telophase II; and production of twice as many pollen mother cells as are found in male-fertile sibs.
All available soybean genotypes of Maturity Group III (515 lines) from the USDA soybean germplasm collection were evaluated for degree of daylength sensitivity at Urbana, Illinois, during the summer of 1973. Each genotype (planted May 19) was grown in four-plant hills, spaced 24 x 40 inches, under both natural daylength and natural daylength extended by 5 hrs incandescent...
Singh et al. (1974) reported the inheritance as well as the pollen behaviour of 3 male-sterile lines of soybean , viz: 'Semmes M.S.1
A soybean germplasm data bank has been set up by members of the Department of Agronomy at the University of Illinois, Urbana-Champaign . Information on named soybean varieties, Plant Introductions, Genetic Type Collection lines, Forage Collection varieties, and species collections, has been compiled and computerized so that it is readily available as a reference source. An...
Powdery mildew was introduced into a Station greenhouse in 1968, apparently with seed of Glycine falcata (PI 246.591). This accession was very susceptible; there was abundant conidia production. The mildew spread to G.max and, before control measures could be instituted, varietal differences in resistance and susceptibility were observed.
By R. L. Bernard, R. I. Buzzel, R. L. Cooper, et al., Published on 04/01/75