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Index Of Authors, Soybean Genetics Newsletter Apr 1979

Index Of Authors, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


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: 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: The Frequency Of Chlorophyll Mutations In Soybeans, V. I. Sichkar Apr 1979

Research Notes: The Frequency Of Chlorophyll Mutations In Soybeans, V. I. Sichkar

Soybean Genetics Newsletter

The first mutations of soybeans in the USSR were received by Leschenko A. in the 30's. In the late 50's, through direct selection of mutations, the first variety called 'Universal 1' was received in the USSR. The second strain-- 'Wonder of Georgia' --was received through crossing of induced mutants of soybeans.


Research Notes: Relay Cropping Of Soybeans And Oats, R. L. Mcbroom, H. H. Hadley, C. M. Brown Apr 1979

Research Notes: Relay Cropping Of Soybeans And Oats, R. L. Mcbroom, H. H. Hadley, C. M. Brown

Soybean Genetics Newsletter

One possibility of increasing land productivity in Illinois is to double crop soybeans following wheat. This practice has been limited to the southern half of the state because of the shorter growing season in the northern half. A modification of double cropping known as relay cropping might allow the earlier establishment of soybeans in wheat or oats and extend the northern limit of double cropping in the state.


Research Notes: Photosynthetic Activity In Chlorophyll Deficient Soybean Leaves Carrying The Y11 Mutant, Reginald D. Nobel Apr 1979

Research Notes: Photosynthetic Activity In Chlorophyll Deficient Soybean Leaves Carrying The Y11 Mutant, Reginald D. Nobel

Soybean Genetics Newsletter

In soybeans, the Y11 gene is involved in chlorophyll synthesis. Thus, in the.heterozygous condition Y11y11 , an intermediate or light-green leaf pigmentation results. Photosynthetic C02 assimilation in the light-green, on a surface area basis, has been reported to be as high or nearly as high as in the homozygous dominant, dark-green plant (Wolf, 1965; Keck et al., 1974; Cappy and Noble, 1974; Crang and Noble, 1978).


Genetic Stocks Available, Soybean Genetics Newsletter Apr 1979

Genetic Stocks Available, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Inheritance Of Male-Sterile, Female-Fertile Mutant Ms3, Reid G. Palmer Apr 1979

Research Notes: Inheritance Of Male-Sterile, Female-Fertile Mutant Ms3, Reid G. Palmer

Soybean Genetics Newsletter

Two non-allelic male-sterile strains each controlled by a single recessive gene, ms1 (Brim and Young, 1971) and ms2 (Bernard and Cremeens, 1975),respectively, have been reported in soybeans. We now have evidence for a third completely male-sterile type controlled by a single recessive gene at adifferent locus from either ms1 or ms2 . As a result of the present study,this mutant was assigned a Genetic Type Collection T-number (T273) and the gene symbol ms3 by the Soybean Genetics Conmittee. This line is maintained as the heterozygote T273H .


Mailing List, Soybean Genetics Newsletter Apr 1979

Mailing List, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Response Of Four Soybean Varieties To Foliar Zinc Fertilizer, I. A. Rose Apr 1979

Research Notes: Response Of Four Soybean Varieties To Foliar Zinc Fertilizer, I. A. Rose

Soybean Genetics Newsletter

Zinc deficiency symptoms are commonly encountered in irrigated soybean crops grown on grey self-mulching clay soils in Northern N.S.W . These experiments aimed to (1) quantify the yield loss due to zinc deficiency at different sites and (2) examine the differences in genotypic sensitivity to zinc deficiency among commercially grown soybean cultivars. Materials and Methods : Experiments were conducted at (1) Narrabri Agricultural Research Station, (2) Breeza Substation and (3) Trangie Agricultural Research Station.


Research Notes: Resistance To Heliothis Armigera And Heliothis Punctigera In Three Soybean Lines, L. D. Tuart, I. A. Rose Apr 1979

Research Notes: Resistance To Heliothis Armigera And Heliothis Punctigera In Three Soybean Lines, L. D. Tuart, I. A. Rose

Soybean Genetics Newsletter

Multiple insect resistance has been detected in the soybean lines PI 171,451, PI 227,687 and PI 229,358 (Van Duyn et al., 1971; Clark et al., 1972; Hatchett et al., 1976). In particular Hatchett et al. (1976) demonstrated resistance to Heliothis zea and Heliothis virescens in all three lines. On the basis of percentage larval mortality, PI 171,451 and PI 229,358 were more resistant to H. zea than H. virescens, while PI 227,687 was equally resistant to both species and also showed superior levels of resistance.


Research Notes: Genetic Analysis Of Factors Controlling Nodulation Response In Soybeans, T. E. Devine, B. H. Breithaupt Apr 1979

Research Notes: Genetic Analysis Of Factors Controlling Nodulation Response In Soybeans, T. E. Devine, B. H. Breithaupt

Soybean Genetics Newsletter

Two of the genes controlling nodulation response in soybeans were tested for linkage associations with genes controlling pubescence color (T) and flower color (W1 ), chlorophyll deficiency (y9 ) and absence of pubescence (P). The rj1 gene (W1lliams and Lynch, 1954) in homozygous recessive condition results in a non-nodulating phenotype with a broad spectrum of Rhizobium japonicum strains. The dominant gene, Rj4 (Vest and Caldwell, 1972) conditions an ineffective nodulation response when inoculated specifically with R. japonicum strain 61 of the Beltsville Culture Collection.


Research Notes: Characterization Of Several Abnormal Nodulation Reactions In Soybeans, R. M. Lawson, J. W. Lambert, G. E. Ham Apr 1979

Research Notes: Characterization Of Several Abnormal Nodulation Reactions In Soybeans, R. M. Lawson, J. W. Lambert, G. E. Ham

Soybean Genetics Newsletter

Several abnormal nodulation reactions in soybeans are known. These range from a complete lack of nodules, caused by the non-nodulating gene (Williams and Lynch, 1954) to plants with normal-appearing nodules (Vest et al., 1973), but low nitrogen fixation as exemplified by the 'Peking'-strain T23 combination. The purpose of the study reported here was threefold.


Research Notes: Inheritance Of Abnormal Nodulation Between Rhizobium Japonicum Strain 62 And The Soybean Variety Amsoy 71, R. M. Lawson, J. W. Lambert, G. E. Ham Apr 1979

Research Notes: Inheritance Of Abnormal Nodulation Between Rhizobium Japonicum Strain 62 And The Soybean Variety Amsoy 71, R. M. Lawson, J. W. Lambert, G. E. Ham

Soybean Genetics Newsletter

To date, four genes are known that result in abnormal nodulation in soybeans. The gene rj1 (Williams and Lynch, 1954; Caldwell, 1966) prevents nodulation with almost all Rhizobium japonicum strains. The genes Rj2 (Caldwell, 1966 ) in combination with strains b7 and bl4 of the 3-24-44 serogroup and bl22 of the 122 serogroup, Rj3 (Vest, 1970) in combination with strain 33, and Rj4 (Vest and Caldwell, 1972) in combination with strain 61 all result in chlorotic plants with abnormal nodulation.


Research Notes: Effect Of Row Spacing And Seed Rate On Soybean Pod Damage By Heliothis Zea-Boddie Under Normal And Late Planting, J. M. Joshi, A. Q. Sheikh Apr 1979

Research Notes: Effect Of Row Spacing And Seed Rate On Soybean Pod Damage By Heliothis Zea-Boddie Under Normal And Late Planting, J. M. Joshi, A. Q. Sheikh

Soybean Genetics Newsletter

Corn earworm (Heliothis zea-Boddie) is one of the most destructive pestsof soybeans (Glycine max [L.] Merrill). Cultural practices, since early days, have been known to play an important role in controlling insect pests in various crops. Some researchers have observed that soybeans with closed canopy escape corn earwonn damage (Dietz et al., 1976) but recent reports from extension entomologists in Maryland are contrary to this effect.


Research Notes: A New Chlorophyll Mutant, David M. Stelly, Patricia S. Muir, Reid G. Palmer Apr 1979

Research Notes: A New Chlorophyll Mutant, David M. Stelly, Patricia S. Muir, Reid G. Palmer

Soybean Genetics Newsletter

A new recessive chlorophyll mutant was unexpectedly recovered in an F2 family of A76-518-3 (a homozygous partially male-sterile, msp msp plant) x A76-669 (a 'Clark' isoline homozygous for the chromosome translocation from PI 101,404B). Furthennore, the translocation did not appear in the F2 generation. We are uncertain as to whether the intended cross was unsuccessful and followed by a natural outcross, or if a new chromosomal rearrangement had taken place. The former seems more likely. The F2 population segregated the partial male sterility trait, so we are certain that a cross was involved.


Research Notes: Spontaneously Occurring Sterile Plants, David M. Stelly, Patricia S. Muir, Reid G. Palmer Apr 1979

Research Notes: Spontaneously Occurring Sterile Plants, David M. Stelly, Patricia S. Muir, Reid G. Palmer

Soybean Genetics Newsletter

Two sterile plants were found in a commercial field of soybeans in Ames in 1977. The plants were noticed because of their retention of chlorophyll when fertile plants had matured and turned brown. One of the plants, 'Sterile A', had set two one-seeded pods, and the other, 'Sterile B', had set 7 seeds.


Recent Soybean Genetics And Breeding Publications, Soybean Genetics Newsletter Apr 1979

Recent Soybean Genetics And Breeding Publications, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


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: 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: 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: 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: 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.


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: 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.


Research Notes: Soybean Linkage Test Between Ti And Le Seed Proteins, J. H. Orf, T. Hymowitz Apr 1979

Research Notes: Soybean Linkage Test Between Ti And Le Seed Proteins, J. H. Orf, T. Hymowitz

Soybean Genetics Newsletter

The F2 linkage results between the Ti locus and Le locus are presented in Table 1. In the table a= Ti Le, b =Tile, c = ti Le and d =ti le. The parents used in the cross were in repulsion phase.Percentage recombination was obtained from the ratio of products following Immer and Henderson (1943).


Research Notes: Evaluation Of Soybean Germplasm, Md. F. Haque, Bhupan Singh, R. Prakash Apr 1979

Research Notes: Evaluation Of Soybean Germplasm, Md. F. Haque, Bhupan Singh, R. Prakash

Soybean Genetics Newsletter

Soybean has been called the miracle crop of the twentieth century. It is one of the most nutritious among beans and pulses, having 40% protein and 20% oil. In view of the chronic shortage of protein and oil in India, soybean is a welcome introduction to provide the much needed stability and boost to the production of these two essential items of food.


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).


Front Matter, Soybean Genetics Newsletter Apr 1979

Front Matter, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.