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Iowa State University

Plant Sciences

Soybean Genetics Newsletter

1979

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Research Notes: The Influence Of Low Temperatures On The Development And Structure Of Yield Formation Of Three Cold Tolerant And A Standard Soybean Variety, E. R. Keller, J. Schmid Apr 1979

Research Notes: The Influence Of Low Temperatures On The Development And Structure Of Yield Formation Of Three Cold Tolerant And A Standard Soybean Variety, E. R. Keller, J. Schmid

Soybean Genetics Newsletter

The amount and stability of the yield of soybeans cultivated under Swiss climatic conditions is still unsatisfactory. Breeding studies (Piattini, 1977; Soldati, 1976) in relation to yield structure under various climatic conditions in Switzerland were conducted. It became evident that poor utilization of the available yield potential of different soybean varieties could be attributed mainly to low temperatures in the course of the vegetation period.


Research Notes: Induced Cytoplasmic Sterility In Soybeans, B. B. Singh, Kamendra Singh, Puspendra Apr 1979

Research Notes: Induced Cytoplasmic Sterility In Soybeans, B. B. Singh, Kamendra Singh, Puspendra

Soybean Genetics Newsletter

One of the M4 progenies of PK-71-39 soybean irradiated with 10 Kr gamma rays showed segregation for sterility in soybean in 1976. It had 18 sterile plants and 4 normal plants, indicating that a single dominant gene was responsible for sterility. The sterile plants had no seeds and, therefore, this appeared to be a dead end for this mutant.


Research Notes: Soybean Germplasm Resistant To Heliothis Zea-Boddie, J. M. Joshi Apr 1979

Research Notes: Soybean Germplasm Resistant To Heliothis Zea-Boddie, J. M. Joshi

Soybean Genetics Newsletter

Corn earwonn (Heliothis zea-Boddie) is a very destructive pest of soybeans (Glycine max [L.] Merrill). It feeds both on foliage as well as developing pods. Each larva is capable of damaging 6 to 8.2 pods or 7. 1 seeds between 4th and 6th (both inclusive) instars (Boldt et al., 1975; Smith and Bass, 1972).


Research Notes: A Breeding Project Aimed At Producing Major Morphological Changes Required To Fit A Soybean "Idiotype", J. R. Tattersfield, J. H. Williams Apr 1979

Research Notes: A Breeding Project Aimed At Producing Major Morphological Changes Required To Fit A Soybean "Idiotype", J. R. Tattersfield, J. H. Williams

Soybean Genetics Newsletter

There is evidence that only small increases in yield have resulted from soybean breeding in the United States during the past 30 years and that some major limitations to yield have been reached (Frey, 1971). During this period the main advances have been in developing resistance to pests and diseases, and improving agronomic traits such as resistance to lodging and shattering. Considerable increases in yield have been achieved during this period in programs conducted for the development of soybeans in the tropics and subtropics. through adaptability to short days and high temperatures.


Research Notes: Evaluation Of Soybean Germplasm For Resistance To Corn Earworm -- Iii, J. M. Joshi Apr 1979

Research Notes: Evaluation Of Soybean Germplasm For Resistance To Corn Earworm -- Iii, J. M. Joshi

Soybean Genetics Newsletter

During previous years (1974-75), soybean cultivars belonging to Maturity Groups 00 to IV were tested in the screenhouse for corn earworm (Heliothis zea-Boddie) resistance and the results were reported in the 1978 issue of Soybean Genetics Newsletter (Joshi, 1978a, 1978b). A new batch of soybean cultivars, 30 belonging to Maturity Group IV and 39 to Maturity Group V, were tested in the screenhouse (54' x 72' x 15') during 1976. Ten seeds of each cultivar were planted on June 16, 1976 in 4 replications, the seeds being 2" apart within the row and rows being 36" apart.


Research Notes: Pollen Movement To Male Sterile Soybeans In Southern Illinois, Randall L. Nelson, Richard L. Bernard Apr 1979

Research Notes: Pollen Movement To Male Sterile Soybeans In Southern Illinois, Randall L. Nelson, Richard L. Bernard

Soybean Genetics Newsletter

The effective use of genetic male sterility in soybeans requires controlled pollen movement. Soybean pollen is carried by insects with bees usually considered the most likely candidate in Illinois. The following experiment was designed to determine how far soybean pollen can be carried to fertilize male sterile soybeans when pollen is also available from adjacent plants.


Front Matter, Soybean Genetics Newsletter Apr 1979

Front Matter, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Selection Of A Maternally Inherited Male-Sterile Trait In Soybeans, J. W. Burton, R. H. Liles Apr 1979

Research Notes: Selection Of A Maternally Inherited Male-Sterile Trait In Soybeans, J. W. Burton, R. H. Liles

Soybean Genetics Newsletter

The induction of male sterility in soybeans with the use of ethidium bromide (EB) was reported in 1977 (Burton, 1977). Further investigations have provided evidence that the sterility of one of the plants recovered from mutagenesis is maternally inherited. In 1976, large samples of 'Ransom', 'Jackson' and 'Lee 74' seeds were treated with EB and planted in the field (the M1 generation).


Research Notes: Morphological Mutat Ions Of Soybeans Induced With Chemical Mutagens And Ganma Rays, V. I. Sichkar Apr 1979

Research Notes: Morphological Mutat Ions Of Soybeans Induced With Chemical Mutagens And Ganma Rays, V. I. Sichkar

Soybean Genetics Newsletter

The method of experimental mutagenesis is effective in investigating the hereditary alterations of plants with their further use in selection. Year by year the research in this field grows wider, covering new research institutions and crops. The purpose of this article was to investigate the efficiency of a number of chemical mutagens and gamma rays in induction of morphological mutations in soybeans with their further use in selection of this crop.


Research Notes: Soybean Linkage Tests, R. I. Buzzell Apr 1979

Research Notes: Soybean Linkage Tests, R. I. Buzzell

Soybean Genetics Newsletter

F2 linkage results are presented in Table l with a= XY, b= Xy, c= xY and d= xy for the eight gene pairs listed in the fonn of Xx and Yy. Percentage recombination was obtained from the ratio products following Irrmer and Henderson (1943). The data for each of the gene pairs gave a good fit to a 3:1 ratio.


Research Notes: Soybean Plant Design For Closed Ecological Life Support System, J. M. Joshi, Brenda L. Spence Apr 1979

Research Notes: Soybean Plant Design For Closed Ecological Life Support System, J. M. Joshi, Brenda L. Spence

Soybean Genetics Newsletter

Prior to the establishment of the space habitats of the future, the life science program office of the National Aeronautics and Space Administration (NASA) is interested in the development of a ground-based manned demonstration of the closed ecological life support system (CELSS). Since CELSS concept centers around complete recycling of all available resources, a genetic plant design to render the total plant more useful is very important. Previous studies (Phillips , 1977; Phillips et al., 1978) conducted for NASA clearly indicate the usefulness of soybean-Plants in such a system.


Announcement, Soybean Genetics Newsletter Apr 1979

Announcement, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Usda Soybean Germplasm Report, Randall L. Nelson, Richard L. Bernard Apr 1979

Usda Soybean Germplasm Report, Randall L. Nelson, Richard L. Bernard

Soybean Genetics Newsletter

We would like to use the Soybean Genetics Newsletter as a means of making an annual report on the USDA soybean germplasm collection at Urbana, Illinois, U.S.A. In September 1978, Randall L. Nelson accepted a position of research geneticist with the USDA and has been assigned to work with the soybean germplasm collection at Urbana. His major duties will be evaluation and utilization of the collection and, with your cooperation, compilation of data already collected on the soybean germplasm.


Symbols At The Rps1 Locus, Soybean Genetics Newsletter Apr 1979

Symbols At The Rps1 Locus, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Aluminum Tolerance In Soybean Germplasm, T. E. Devine, C. D. Foy, D. L. Mason, A. L. Fleming Apr 1979

Research Notes: Aluminum Tolerance In Soybean Germplasm, T. E. Devine, C. D. Foy, D. L. Mason, A. L. Fleming

Soybean Genetics Newsletter

Aluminum in the soil solution is a severe growth limiting factor in certain acid soils (Foy, 1964; Long and Foy, 1970). This problem is particularly serious in acid subsoils (Adams and Lund, 1966; Foy, 1964) which are difficult to lime. Recent research has centered on selecting those plant cultivars which demonstrate a degree of tolerance to soil aluminum.


Research Notes: Soybean Parental Lines, R. I. Buzzell, B. R. Buttery Apr 1979

Research Notes: Soybean Parental Lines, R. I. Buzzell, B. R. Buttery

Soybean Genetics Newsletter

Seed of five improved breeding lines (Table 1) is available upon request for use in crosses or experimental work. Disease reactions are given in Table 2 and physiological attributes in Table 3. The lines are somewhat improved over the unadapted parents; however, only OX610I has been yield tested.


Research Notes: Significance Of Incompatibility Reactions Of Rhizobium Japonicum Strains With Soybean Host Genotypes, T. E. Devine Apr 1979

Research Notes: Significance Of Incompatibility Reactions Of Rhizobium Japonicum Strains With Soybean Host Genotypes, T. E. Devine

Soybean Genetics Newsletter

Soybeans normally nodulate with Rhizobium japonicum and fix nitrogen in symbiotic association. However, several interactions, under genetic control, have been reported which result in ineffective nodulation or failure of the fixation process despite substantial nodule development. The recessive gene, rj1 , (Williams and Lynch, 1954) in homozygous mode, results in the exclusion from nodulation of a broad spectrum of Rhizobium jabonicum strains in soil culture.


Research Notes: Transgressive Inheritance Of Early Maturity For Breeding Of Extremely Early Soybean Cultivars, Chin-Ling Wang, Fun-Lang Kao Apr 1979

Research Notes: Transgressive Inheritance Of Early Maturity For Breeding Of Extremely Early Soybean Cultivars, Chin-Ling Wang, Fun-Lang Kao

Soybean Genetics Newsletter

The key point to extend soybean growing area to the cool, long day length, and short-growing season regions of the high latitude is breeding of day-neutral and cool-tolerable extremely early cultivars. Several countries have already got a distinct achievement in this respect. For example, extremely early soybean cultivars of Maturity Group 00 even 000 have been developed in countries of North America and North Europe.


Research Notes: Aneuploids And Chromosome Aberrations From Irradiated Soybeans, K. Sadanaga, R. Grindeland Apr 1979

Research Notes: Aneuploids And Chromosome Aberrations From Irradiated Soybeans, K. Sadanaga, R. Grindeland

Soybean Genetics Newsletter

Irradiation treatment of seeds, pollen, or sporocytes has been used successfully to produce aneuploids in a number of genera. When Dr. E. G. Hammond had finished selecting M1 plants from his neutron irradiation experiment, I had the opportunity to go through his radiated material to select off-type and semi-sterile plants and to determine the kinds of aneuploids produced by radiation of soybeans. One- and two-seeded pods from remnant M1 plants were harvested, the M2 plants grown in the field, and the M3 progenies of M2 plants with more than 20% aborted pollen grains were checked for chromosome number and aberrations ...


Research Notes: Variation In Percent Seed Oil In Related Nodulating And Non-Nodulating F2 Plants And F3 Progenies From Three Soybean Crosses, Henry H. Hadley, Koffi Attiey Apr 1979

Research Notes: Variation In Percent Seed Oil In Related Nodulating And Non-Nodulating F2 Plants And F3 Progenies From Three Soybean Crosses, Henry H. Hadley, Koffi Attiey

Soybean Genetics Newsletter

The soybean (Glycine max [L.] Merrill) uses both combined nitrogen from the soil and symbiotically fixed nitrogen from the air if effective nodules are present on its roots. Both sources of nitrogen are required for maximum yields at reasonable costs. In the absence of nodules, yields can be brought up to the level of those where effective nodules are present, but only with a high rate of nitrogen fertilizer application.


Research Notes: Genetics Of The Meiotic Mutant St5, Reid G. Palmer Apr 1979

Research Notes: Genetics Of The Meiotic Mutant St5, Reid G. Palmer

Soybean Genetics Newsletter

In 1970, a part-sterile plant in Uniform Test I, entry W6-4108 (from Wisconsin), was observed at Ames, Iowa. Seven seeds from this part-sterile plant gave rise to seven plants in 1971; six were fertile and one was sterile and set no seeds. In 1972, five plant progeny rows gave all fertile plants, i.e., they did not segregate fertile and sterile plants.


Research Notes: Preliminary Studies For Screening Techniques On Shade Tolerance Of Soybean, Shin Han Kwon, Jong Lak Won Apr 1979

Research Notes: Preliminary Studies For Screening Techniques On Shade Tolerance Of Soybean, Shin Han Kwon, Jong Lak Won

Soybean Genetics Newsletter

Soybean intercropping with other crops usually causes poor yield, mainly by light reduction . Sometimes, a continuous rainfall during the growing season in the area of monsoon is a major factor for yield reduction in soybean by insufficient sunlight as well as shading by intercropping. Recently our laboratory has collected over 1500 lines as germplasm for Korean native soybean lines and has conducted tests for evaluation of various agronomic characters.


Research Notes: Studies On Phytophthora Rot In Soybeans, Thomas C. Kilen Apr 1979

Research Notes: Studies On Phytophthora Rot In Soybeans, Thomas C. Kilen

Soybean Genetics Newsletter

The cultivar 'Tracy' had been extensively used as a parent in breeding programs even before Laviolette and Athow (1977) reported that it was resistant to all nine of the identified races of Phytophthora megasperma Drech. var. sojae Hildeb. Kilen (1977) reported that Tracy had two major genes for resistance to race 1 of the pathogen. His data, based upon segregation of the F2 generation, also suggested that the two genes occupied loci different from Rps1 and Rps2. This paper is a report on the reaction of (1) F2 populations from the crosses 'Pickett 71' x Tracy and Tracy x D60-9647 ...


Research Notes: A Cytologically Identifiable Short Chromosome, David M. Stelly, Hollys E. Heer, Reid G. Palmer Apr 1979

Research Notes: A Cytologically Identifiable Short Chromosome, David M. Stelly, Hollys E. Heer, Reid G. Palmer

Soybean Genetics Newsletter

Seeds set on partially male-sterile plants (see article 2 for a description of the sterility system) were grown in the greenhouse in the spring of 1977. One of the plants, designated D56, had an unusual growth habit --the plant was somewhat spindly, climbing, and had a thin main stem. It had been noted at the time of transplanting that the root system of the D56 seedling consisted of a very long tap root and unusually thin lateral roots.


Research Notes: Cross Pollination Studies Of Soybeans Using A Genetic Male Sterile System, William H. Davis, Harry Van Der Vliet Apr 1979

Research Notes: Cross Pollination Studies Of Soybeans Using A Genetic Male Sterile System, William H. Davis, Harry Van Der Vliet

Soybean Genetics Newsletter

Information regarding cross pollinating insects in soybeans has been mainly restricted to honeybees. Erickson (1975) reported that attractiveness of soybeans to honey bees appeared to be heritable. Jaycox (1970) reported on the ecological relationships between honey bees and soybeans.


Research Notes: Seed Coats Of Glycine Soja And "G. Gracilis" --Inheritance Of Color/Pattern, David M. Stelly, Reid G. Palmer Apr 1979

Research Notes: Seed Coats Of Glycine Soja And "G. Gracilis" --Inheritance Of Color/Pattern, David M. Stelly, Reid G. Palmer

Soybean Genetics Newsletter

In the preceding note, it was mentioned that the derivation of an abnormally short chromosome involved natural cross-pollination of a partially malesterile (msp msp) plant (A76-517-2) by pollen from G. soja, G. gracilis", or an introgression product of these species into G. max. The recessive allele for self seed coat color (i) and the allele(s) producing the dark seed coat pattern of G. soja and "G.-gracilis" were concomitantly transferred in the cross-pollination. Segregation in later generations and a few testcrosses indicate that the characteristically patterned seed coats of G. soja and "G. gracilis" are governed by an allele ...


Research Notes: Inheritance Of Resistance To Necrotic Strain Of Smv In Soybean, Shin Han Kwon, Jeung Haing Oh Apr 1979

Research Notes: Inheritance Of Resistance To Necrotic Strain Of Smv In Soybean, Shin Han Kwon, Jeung Haing Oh

Soybean Genetics Newsletter

A necrotic strain of soybean mosaic virus (SMV) is one of the most destructive diseases in some leading soybean cultivars of Korea and its infection sometimes causes complete loss of the crop. The necrotic disease reported first as a strain of soybean mosaic virus in 1976, affects the most promising corrmercial cultivars, 'Kwangkyo' and 'Gangrim', which have been cultivated extensively since released in 1969. Hence, an investigation on the mode of inheritance of resistance gene in soybean cultivars was undertaken to develop resistant lines to the necrotic virus disease by mutation technique, which is being carried out with the cultivar ...


Research Notes: Five Marker Genes Independent Of Ms2, Randall L. Nelson, Richard L. Bernard Apr 1979

Research Notes: Five Marker Genes Independent Of Ms2, Randall L. Nelson, Richard L. Bernard

Soybean Genetics Newsletter

In 1976 several crosses were made to determine if any linkage existed between ms2 and selected genes from the Genetic Type Collection (Bernard and Weiss, 1973). The results from the F2 generation are presented in Table 1 with a= XV, b= xV, c= Xy and d= xy for the gene pairs listed in the form Xx and Vy. The ratio of products method (Irrmer and Henderson, 1943) was used to determine the percentage recombination.


Report Of Soybean Genetics Committee, R. L. Bernard, H. R. Boerma, T. E. Devine, Theodore Hymowitz, T. C. Kilen, R. G. Palmer, J. R. Wilcox Apr 1979

Report Of Soybean Genetics Committee, R. L. Bernard, H. R. Boerma, T. E. Devine, Theodore Hymowitz, T. C. Kilen, R. G. Palmer, J. R. Wilcox

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Inheritance Of Male-Sterile, Female-Fertile Mutant Ms4, Reid G. Palmer Apr 1979

Research Notes: Inheritance Of Male-Sterile, Female-Fertile Mutant Ms4, Reid G. Palmer

Soybean Genetics Newsletter

The previous article mentioned male-sterile mutants ms1 and ms2 anddescribed the genetics of a new male-sterile mutant, ms3. We now have evidencefor a fourth completely male-sterile type controlled by a single recessive gene at a different locus from either ms1 , ms2 or ms3. As a result ofthe present study, this mutant was assigned a Genetic Type Collection T-number(T274) and the gene symbol ms 4 by the Soybean Genetics Corrmittee. This line is maintained as the heterozygote T274H .