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Soil Heat And Water Flow With A Partial Surface Mulch, Sang-Ok Chung, Robert Horton Jr. Dec 1987

Soil Heat And Water Flow With A Partial Surface Mulch, Sang-Ok Chung, Robert Horton Jr.

Agronomy Publications

A computer model using the alternating direction implicit (ADI) finite difference method to study two-dimensional coupled soil heat and water flow with a partial surface mulch cover is developed. A new, simplified computational procedure, which has only tridiagonal matrix problems, for the ADI method is introduced. The model uses a soil surface energy balance equation to determine soil surface boundary conditions for both heat and water flow. The inputs required for the computer simulations are weather data, soil thermal and hydraulic properties, and mulch data. Numerical experiments are performed to examine the effects of soil type, mulch width, and weather ...


Diphenylchloronitroethane Insecticides, Joel R. Coats, Laura L. Karr, Rebecca L. Fryer, Hunter S. Beard Nov 1987

Diphenylchloronitroethane Insecticides, Joel R. Coats, Laura L. Karr, Rebecca L. Fryer, Hunter S. Beard

Entomology Publications

Insecticidal activity of chloronitroalkanes was predicted on the basis of structure-activity relationships. Two series of new bis(substituted-phenyl) chloronitroalkanes were synthesized and evaluated for insecticidal activity. The synthetic pathway proceeded through phenylnitroethanols and diphenylnitroethanes as intermediates. Final products were 1,1-bis (substituted-phenyl)-2-chloro-2-nitroethanes and 1,1-bis(substituted-phenyl)-2,2-dichloro-2-nitroethanes. Aromatic substituents were selected from alkyl, alkoxy, and halogen moieties. Following purifications and confirmation of structures, the compounds were bioassayed against insects. The two series were compared for potency, as were various combinations of X and Y substituents. Adult female house flies (Musca domestica), mosquito larvae (Aedes aegypti), western corn rootworm ...


Allelic Differences At Enzyme Loci And Hybrid Performance In Maize, K. R. Lamkey, A. R. Hallauer, A. L. Kahler Jul 1987

Allelic Differences At Enzyme Loci And Hybrid Performance In Maize, K. R. Lamkey, A. R. Hallauer, A. L. Kahler

Agronomy Publications

Evaluation of hybrids to identify lines with superior combining ability is a time-consuming and expensive phase of hybrid breeding programs. Techniques that would allow the breeder to screen lines for combining ability before evaluation in hybrid combinations are desirable. Twenty-four high-yielding and 21 low-yielding lines selected for their relative yield from a group of 247 inbred lines derived by single-seed descent from the ‘lowa Stiff Stalk Synthetic’ maize (Zea mays L.) population were assayed electrophoretically. High X high, high X low, and low X low hybrids of the high-and low-yielding lines were evaluated, and the genotypes at 11 enzyme marker ...


Molecular-Marker-Facilitated Investigations Of Quantitative-Trait Loci In Maize. I. Numbers, Genomic Distribution And Types Of Gene Action, Jonathan F. Wendel, M. D. Edwards, Charles W. Stuber May 1987

Molecular-Marker-Facilitated Investigations Of Quantitative-Trait Loci In Maize. I. Numbers, Genomic Distribution And Types Of Gene Action, Jonathan F. Wendel, M. D. Edwards, Charles W. Stuber

Jonathan F. Wendel

Individual genetic factors which underlie variation in quantitative traits of maize were investigated in each of two F 2 populations by examining the mean trait expressions of genotypic classes at each of 17-20 segregating marker loci. It was demonstrated that the trait expression of marker locus classes could be interpreted in terms of genetic behavior at linked quantitative trait loci (QTLs). For each of 82 traits evaluated, QTLs were detected and located to genomic sites. The numbers of detected factors varied according to trait, with the average trait significantly influenced by almost two-thirds of the marked genomic sites. Most of ...


Research Notes : United States : New Mutations In A Genetically Unstable Line Of Soybean, R. W. Groose, Reid G. Palmer Apr 1987

Research Notes : United States : New Mutations In A Genetically Unstable Line Of Soybean, R. W. Groose, Reid G. Palmer

Soybean Genetics Newsletter

Most plants of the Asgrow Mutable line of soybean are chimeric for flow-er color (Groose and Palmer, 1986). Mutable plants produce both entirely near-white and entirely purple flowers, as well as flowers of mutable phenotype with purple sectors on near-white petals. This line carries an unstable recessive ('mutable') allele of the w4 locus that conditions anthocyanin pigmentation (Weigelt et al., 1986)..pdf


Research Notes : Varietal Differences Of Soybeans Sensitivity To Low Temperatures During Germination, V. I. Sichkar, V. V. Sherepitko, T. N. Balashov Apr 1987

Research Notes : Varietal Differences Of Soybeans Sensitivity To Low Temperatures During Germination, V. I. Sichkar, V. V. Sherepitko, T. N. Balashov

Soybean Genetics Newsletter

Developing of cold-tolerant soybean varieties is one of the new main trends in soybean breeding. Such studies were started in the USA (Veitenheimer et al., 1984; Unander and Orf, 1984; Harrison and Nickell, 1984; Hillsman et al., 1977; Hicks, 1978; Seddigh and Jolliff, 1984; Littlejohns and Tanner, 1976; Hume and Jackson, 1981; Voldeng et al., 1984; Sanbuichi, 1980; Goto and Yamamoto, 1972; Schmid and Keller, 1980; Szyrmer and Janicka, 1985; Gromova, 1975; Lunin, 1981; Malysh and Bobrikov, 1984; Sherepitko and Balashow, 1985). The experiments demonstrated that low temperatures reduced germination, field emergence, the rate of early growth and soybean yield.


Research Notes : China : Inheritance Of Bloom On Seed Coat In Soybean, Guodong Zhang, Jinling Wang, Qingxi Meng Apr 1987

Research Notes : China : Inheritance Of Bloom On Seed Coat In Soybean, Guodong Zhang, Jinling Wang, Qingxi Meng

Soybean Genetics Newsletter

Woodworth (1932, 1933) reported that three dominant genes (B1 B2 BJ) were necessary for the development of bloom on seed coat. Tang and Tai (1962) and Tang and Li (1964) pointed out that, in interspecific cross, Glycine max x G. formosana, complementary genes for bloom on seed coat existed, and the genetic constitutions for G. max were B1 B1 b2 b2 bJ bJ, those for G. formo-sana were B1 B1 B2 B2 BJ BJ. The purpose of this experiment was to give a further study on this character with more and new parental materials.


Research Notes : Peru : Phenotypic Stability Of Soybean In Peru, Jose Bruno Angeles Apr 1987

Research Notes : Peru : Phenotypic Stability Of Soybean In Peru, Jose Bruno Angeles

Soybean Genetics Newsletter

Introduction: In countries like Peru, where soybean is an introduced crop, it is necessary to utilize high technology suitable for the coast and jungle ecological conditions, in order to achieve productive success. Besides mechanization, it is very important to use seed of high genetic value, stored under optimum conditions. These two conditions would contribute to minimize the risks that very often affect the farmers. The basic idea is to consider the variety to be used and its possible interaction with the environment.


Research Notes : United States : Screening Of The Usda Glycine Soja Collection For Urease Variants, T. L. Mervosh, T. Hymowitz Apr 1987

Research Notes : United States : Screening Of The Usda Glycine Soja Collection For Urease Variants, T. L. Mervosh, T. Hymowitz

Soybean Genetics Newsletter

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 : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards ; Air Pollution, G. Gupta, R. B. Dadson Apr 1987

Research Notes : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards ; Air Pollution, G. Gupta, R. B. Dadson

Soybean Genetics Newsletter

Relationships between the three major ambient air pollutants -ozone (03), sulphur dioxide (S02) and nitrogen dioxide (N02) -have been explored experimentally using linear regression analysis. It has been shown that the amount of 03 in ambient air is based on the total amount of S02 + N02 and that the concentration of 03 can be predicted from the concentration of S02 + N02. On the basis of the data collected, a modified N02 -03 photolytic cycle has been proposed taking into account dry precipitation of S02 and N02.


Research Notes : Australia : Designation Of A "Core" Collection Of Perennial Glycine, A. H. D. Brown, J. P. Grace, S. S. Speer Apr 1987

Research Notes : Australia : Designation Of A "Core" Collection Of Perennial Glycine, A. H. D. Brown, J. P. Grace, S. S. Speer

Soybean Genetics Newsletter

Over the last decade, a large germplasm collection of the 12 currently recognized perennial species of Glycine has been assembled. This collection, now numbering more than 1400 accessions, is held in Canberra, Australia, and is recognized by the International Board of Plant Genetic Resources as the world base collection for perennial Glycine. The 12 species include five that have been described recently.


The Germplasm Resources Information Network: Easy Access To Soybean Germplasm Data, Soybean Genetics Newsletter Apr 1987

The Germplasm Resources Information Network: Easy Access To Soybean Germplasm Data, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes : Inheritance Of Hardseededness In Soybean, V. F. Marjushkin, V. I. Sichkar, V. G. Michailov, L. V. Polivoda Apr 1987

Research Notes : Inheritance Of Hardseededness In Soybean, V. F. Marjushkin, V. I. Sichkar, V. G. Michailov, L. V. Polivoda

Soybean Genetics Newsletter

Soybean is often characterized by hardseededness or seed impermeability, when the seeds do not imbibe water and they germinate very slowly. Germination period of such seeds is very prolonged for a month or more. Hardseededness is caused by reduced water permeability of seed coat. We meet this character in many plant species, but more often in Leguminosae, Rosaceae, Lilium (Chorniy, 1980).


Locus-To-Locus Linkage Assays In Soybean, Soybean Genetics Newsletter Apr 1987

Locus-To-Locus Linkage Assays In Soybean, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Soybean Genetics Committee Report, R. L. Bernard, G. R. Bowers, R. I. Buzzell, X. Delannay, Y. T. Kiang, B. A. Mcblain, R. G. Palmer, J. H. Orf Apr 1987

Soybean Genetics Committee Report, R. L. Bernard, G. R. Bowers, R. I. Buzzell, X. Delannay, Y. T. Kiang, B. A. Mcblain, R. G. Palmer, J. H. Orf

Soybean Genetics Newsletter

No abstract provided.


Research Notes : United States : Seed Production By Male-Sterile Soybeans In Missouri, Robert Graybosch, Mark Edge, Xavier Delannay Apr 1987

Research Notes : United States : Seed Production By Male-Sterile Soybeans In Missouri, Robert Graybosch, Mark Edge, Xavier Delannay

Soybean Genetics Newsletter

The production of hybrid soybean will require the discovery of F1 heterosis of a magnitude that provides growers the incentive to purchase hybrid seed. The primary barrier to the testing of F1 heterosis is the acquisition of adequate quantities of F1 seed (Nelson and Bernard, 1984). Presently, the most efficient means of obtaining experimental quantities of hybrid seed is through the use of nuclear (genie) male-sterile mutations.


Research Notes : United States : Necrotic Root Mutants In A Genetically Unstable Line Of Soybean, R. W. Groose, Reid G. Palmer, S. M. Blomgren Apr 1987

Research Notes : United States : Necrotic Root Mutants In A Genetically Unstable Line Of Soybean, R. W. Groose, Reid G. Palmer, S. M. Blomgren

Soybean Genetics Newsletter

Mutations for necrotic roots were identified in an experiment designed to recover new mutations in the Asgrow Mutable line as evidence for transposition of a mobile genetic element (Groose and Palmer, 1987). Each of three independent mutations for necrotic roots was discovered in a different F11 family, each of which had descended from a different F9 plant of the Asgrow Mutable line. Seedlings of 1"936 F11 families were pulled from the sandbench at the second trifoliolate leaf stage and roots were examined for nonfluorescent root mutations.


Research Notes : United States : New Male-Sterile, Female-Fertile Mutations In Soybean, Halina Skorupska, Reid G. Palmer Apr 1987

Research Notes : United States : New Male-Sterile, Female-Fertile Mutations In Soybean, Halina Skorupska, Reid G. Palmer

Soybean Genetics Newsletter

Three new spontaneous independent male-sterile, female-fertile (MS-FF) mutations were used for cytological observations and for allelism tests. One of them was found in the cultivar 'Beeson'. The JB and BDI mutations were found in advanced breeding populations.


Research Notes : United States : Response Of Soybean Strains To Dpx-F6025 In Hydroponics, G. J. Pomeranke, C. D. Nickell, L. Wax Apr 1987

Research Notes : United States : Response Of Soybean Strains To Dpx-F6025 In Hydroponics, G. J. Pomeranke, C. D. Nickell, L. Wax

Soybean Genetics Newsletter

Introduction: Previous work with DPX-F6025 (2-(([(4-chloro-6-methoxy-pyrimidine-2-yl) amino carbonyl] amino sulfonyl)) benzoic acid, ethyl ester) found differential strain response to increasing rates in hydroponics (Lloyd, 1985). Hanson (1984) reported differential strain response to a single rate of metribuzin in soybeans when evaluated in a hydroponic system similar to one developed by Barrentine et al. (1976). With known agronomic changes in soybeans associated with herbicide treatments, this study was undertaken to study the agronomic effects of DPX-F6025 on a randomly selected group of soybean strains when evaluated in a hydroponic system.


Research Notes : United States : Preliminary Investigations On The Salt Tolerance Of Wild Perennial Glycine Species, T. Hymowitz, J. T. Woolley, D. B. Peters Apr 1987

Research Notes : United States : Preliminary Investigations On The Salt Tolerance Of Wild Perennial Glycine Species, T. Hymowitz, J. T. Woolley, D. B. Peters

Soybean Genetics Newsletter

In 1983, 1984, and 1985, the senior author collected wild perennial Glycine species in the South Pacific (New Caledonia, Vanuatu, Tonga) and in Australia (Queensland including Great Barrier Reef islands, Western Australia, Northern Territory). The collecting trips were sponsored by the Rockefeller Foundation and the International Board of Plant Genetic Resources. The latter collecting trips were conducted jointly with scientists from CSIRO/ Canberra.


Southern Soybean Germplasm Collection Report, Soybean Genetics Newsletter Apr 1987

Southern Soybean Germplasm Collection Report, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes : United States : The Use Of Gradient Page Gels To Study Soybean Isozymes, M. B. Gorman, M. P. Yasenchack, S. Kring, K. Paull Apr 1987

Research Notes : United States : The Use Of Gradient Page Gels To Study Soybean Isozymes, M. B. Gorman, M. P. Yasenchack, S. Kring, K. Paull

Soybean Genetics Newsletter

Soybean isozymes have been studied genetically primarily with simple PAGE and starch gel electrophoresis (see Rennie et al., 1986, for a comparison and Kiang and Gorman, 1983, or Palmer et al., 1985, for reviews). Our objective was to test if the use of vertical gels with a PAGE concentration gradient would enhance isozyrne resolution over simple horizontal PAGE gels. Gradient gels were tested for their ability to resolve: amylase (Am), acid phosphatase (AP), Diaphorase (Dia), gl~cose-6-phosphate dehydrogenase (GPD), 6-phosphogluconate dehydrogenase (PGD), phosphoglucomutase (PGM) and superoxide dismutase/tetrazolium oxidase (SOD/TO) isozymes.


Research Notes : Pakistan : Induction Of Polygenic Variance In Soybean, Mushtaque Ahmed Rajput Apr 1987

Research Notes : Pakistan : Induction Of Polygenic Variance In Soybean, Mushtaque Ahmed Rajput

Soybean Genetics Newsletter

The effect of gamma-rays on variability for three quantitative characters (number of pods, seeds, and grain yield per plant) of soybean were studied. In the M2 generation, the shifts of mean values of irradiated material for all the polygenic characters occurred towards the positive or negative direction. However, the coefficient of variability increased in all the treatments for the attributes studied. This additional genetic variability would provide an opportunity for improvement of soybean by selection.


Research Notes : Turkey : Effect Of Cheese Whey As A Fertilizer On The Increase Of Soybean Nodules, Atilla Konar, H. Halis Arioglu Apr 1987

Research Notes : Turkey : Effect Of Cheese Whey As A Fertilizer On The Increase Of Soybean Nodules, Atilla Konar, H. Halis Arioglu

Soybean Genetics Newsletter

Cheese whey, a dairy by-product with an estimated world production of 72 million tons, is a polluter to the environment if it is not treated before disposal. Among some practical and simple uses of whey is the use of it as a liquid fertilizer, which was the case in the pastures of USA and many other countries in the 1960s (Ryder, 1980). Since whey contains 50-55% of the dry matter of whole milk, it is rich in organic carbohydrate, fat, and some proteins and inorganic matter (mineral matter) and also in mostly lactic acid bacteria; 3 tons of whey equals ...


Research Notes : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards : Pests, M. Rangappa, M. E. Kramer, P. S. Benepal Apr 1987

Research Notes : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards : Pests, M. Rangappa, M. E. Kramer, P. S. Benepal

Soybean Genetics Newsletter

One of the major objectives of the proposal is systematic screening of all available soybean germplasm of Maturity Groups III to VIII for a natural resistance to a major insect pest, the Mexican bean beetle (MBB). These six Maturity Groups (III-VIII) cover abouL 5,000 plant introductions (Pis), 350 commercial varieties, and 80 breeding lines. Selected accessions of the most resistant (35% or less leaf defoliation) and highly susceptible (over 75% leaf defoliation) in general screening under field conditions were re-evaluated in triplicate in 1985 and in quadruplicate in 1986 (Table 2). About 20 special selections were evaluated for MBB ...


Research Notes : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards : Diseases, R. P. Pacumbaba, V. T. Sapra Apr 1987

Research Notes : United States : Evaluation Of Soybean Germplasm For Stress Tolerance And Biological Efficiency Towards : Diseases, R. P. Pacumbaba, V. T. Sapra

Soybean Genetics Newsletter

A field study was conducted for screening and selection of improved soybean germplasm for disease resistance in 1986. The soybean crossing block consisted of 207 germplasm entries screened at flowering and at maturity. One hundred and one were resistant and moderately resistant to bacterial blight (BB).


Soybean Germplasm Crop Advisory Committee Report, Soybean Genetics Newsletter Apr 1987

Soybean Germplasm Crop Advisory Committee Report, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes : Segregation Of The F2 Populations And F3 Families, V. V. Sherepitko, V. I. Sichkar Apr 1987

Research Notes : Segregation Of The F2 Populations And F3 Families, V. V. Sherepitko, V. I. Sichkar

Soybean Genetics Newsletter

To determine the number of genes determining cold resistance, the method proposed by Merezhko (1983) was used. According to the distribution of the F2 plants, it was concluded that the part of the progenies like a recessive parent averaged 25%. From this, we concluded that parental forms in the crosses differ from each other by the alleles of one gene.


Research Notes : Brazil : Effects Of Seed Color On Seed Deterioration, E. A. Kueneman, A. V. Costa Apr 1987

Research Notes : Brazil : Effects Of Seed Color On Seed Deterioration, E. A. Kueneman, A. V. Costa

Soybean Genetics Newsletter

It has been noted (Dassou and Kueneman, 1984) that soybean varieties with colored seed frequently show tolerance to seed deterioration. In Brazil, naturally occurring, colored-seeded mutants of four soybean lines have been found. The existence of these near-isolines provided an opportunity to assess the role of seed color on seed deterioration in similar genetic backgrounds


Research Notes : Canada : Harosoy Rps Isolines, R. I. Buzzell, T. R. Anderson, B. D. Rennie Apr 1987

Research Notes : Canada : Harosoy Rps Isolines, R. I. Buzzell, T. R. Anderson, B. D. Rennie

Soybean Genetics Newsletter

The development of Rps isolines of 'Harosoy' has been reported (Buzzell et al., 1984). The Rpsl-a and Rps5 isolines were available as 'Harosoy 63' and L62-904, respectively. Isolines have been completed for Rpsl-b, Rpsl-k, Rps3, Rps4, and Rps6. Rpsl-c is at BC6 and Rps3-b is at BC1.