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Iowa State University

Plant Sciences

Soybean Genetics Newsletter

1981

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Front Matter, Soybean Genetics Newsletter Apr 1981

Front Matter, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Variation For Seed Yield, Its Quality And Nutritional Traits In Soybeans, N. D. Rana, R. K. Kalia, V. P. Gupta Apr 1981

Research Notes: Variation For Seed Yield, Its Quality And Nutritional Traits In Soybeans, N. D. Rana, R. K. Kalia, V. P. Gupta

Soybean Genetics Newsletter

To bring about genetic improvement for any economic trait in economic plants, the foremost prerequisite is the presence of sufficient amount of genetic variability for the trait under improvement in the organism t o be improved. In the present investigation, an attempt has been made to get the information on nature and magnitude of variability for various seed quality traits along with seed yield traits in the soybean germplasm maintained at the Himachal Pradesh Agricultural University, Palampur. Materials and methods: The material for the present study consisted of 250 diverse genotypes of soybeans of both indigenous and exotic origin , and ...


Announcements, Soybean Genetics Newsletter Apr 1981

Announcements, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Pod Setting Under Standard Crossing Procedures In Soybean, Hari Har Ram, V. D. Verma, Kamendra Singh, Pushpendra Apr 1981

Research Notes: Pod Setting Under Standard Crossing Procedures In Soybean, Hari Har Ram, V. D. Verma, Kamendra Singh, Pushpendra

Soybean Genetics Newsletter

The success in artificial crossing in soybean is generally poor . Each breeder uses his own imagination and refinements in the technique of crossing. The standard emasculation and pollination procedure as described by Johnson and Bernard (1963) and Paschal (1975) is being followed at this center.


Mailing List, Soybean Genetics Newsletter Apr 1981

Mailing List, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Interactions Of Cultural Practices With Insect-Induced Stress On Soybeans, P. W. Wells, J. M. Joshi, G. P. Dively Apr 1981

Research Notes: Interactions Of Cultural Practices With Insect-Induced Stress On Soybeans, P. W. Wells, J. M. Joshi, G. P. Dively

Soybean Genetics Newsletter

Numerous reports exist which characterize yield loss and defoliation relationships. Management guidelines and decisions regarding defoliating pests have been based largely upon findings from one or more of those studies . The use of such studies as decision-making criteria may be limited since most defoliation yield-related research has been conducted in the Midwest with varieties , growth habits and environmental conditions widely divergent from those found in other areas of production.


Research Notes: Observations And Evaluation Of G. Gracilis And G. Soja Forms For Crossing Within The Glycine Genus Under Climatic Conditions In Poland, H. Skorupska Apr 1981

Research Notes: Observations And Evaluation Of G. Gracilis And G. Soja Forms For Crossing Within The Glycine Genus Under Climatic Conditions In Poland, H. Skorupska

Soybean Genetics Newsletter

Wild species of cultivated plants are well known to possess a high potential of adaptability manifested by high tolerance to unfavorable environmental conditions and to pathogens. They are often carriers of valuable biochemical properties. To have these properties transmitted to cultivated species would no doubt be advantageous from the point of view of agriculture .


Research Notes: Breeding Soybean For Drought Tolerance, A. Vidal Apr 1981

Research Notes: Breeding Soybean For Drought Tolerance, A. Vidal

Soybean Genetics Newsletter

The extension of soybean cultivation in the south part of Europe is limited by climatic conditions and, above all, by drought appearing each year during summer, in a time which is a critical period for water supply of soybeans: the grain and pod filling stages (Mingeau , 1975). By action of this drought, grain yields may decrease drastically. As irrigation is often impossible, one of the most important breeding objectives in France is drought tolerance . Although water relations of ten should be studied in soybeans , varietal differences were rarely investigated except by Mederski and Jeffers (1973) and Sammons et al. (1978 ...


Research Notes: Soybean Tissue Culture, David A. Evans Apr 1981

Research Notes: Soybean Tissue Culture, David A. Evans

Soybean Genetics Newsletter

The recently developed techniques of plant tissue culture have been used to develop somatic cell geneti cs programs in solanaceous species , particularly Petunia , Nicotiana, and Datura (Vasil et al., 1979). Development of tissue culture techniques has permitted the isolation of biochemical mutants, production of somatic hybrids, and recovery of haploid plants. Unfortunately, extrapolation of these techniques to leguminous and graminaceous species of greater economic importance has proven quite difficult.


Research Notes: Effect Of Grafting Date And Maturity Of The Stock On The Flowering Behavior Of Soybean Scions, J. S. Beaver, R. L. Nelson Apr 1981

Research Notes: Effect Of Grafting Date And Maturity Of The Stock On The Flowering Behavior Of Soybean Scions, J. S. Beaver, R. L. Nelson

Soybean Genetics Newsletter

Many crosses made by midwestern U.S. soybean breeders are made between adapted genotypes and genotypes of later maturity. Due to a short growing season, soybean breeders in the northern U. S. are often unable to sufficiently delay planting of adapted genotypes to synchronize flowering with genotypes of later maturity. Photoperiod chambers are expensive and covering plants is time consuming and often produces cleistogamous flowers.


Research Notes: An Allelism Study Of The Inheritance Of The Lack Of Soybean Lectin In Five Soybeain Lines, R. W. Stahlhut, T. Hymowitz Apr 1981

Research Notes: An Allelism Study Of The Inheritance Of The Lack Of Soybean Lectin In Five Soybeain Lines, R. W. Stahlhut, T. Hymowitz

Soybean Genetics Newsletter

Pull et al. (1978) found five soybean lines ( 'Columbia' , 'Norredo', 'Sooty', Tl02 and 'Wilson-5') 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 Seed Β-Amylase Variants, D. F. Hildebrand, T. Hymowitz Apr 1981

Research Notes: Soybean Seed Β-Amylase Variants, D. F. Hildebrand, T. Hymowitz

Soybean Genetics Newsletter

Hildebrand and Hymowitz (1980a) reported that two soybean genotypes were found that lack detectable seed a- amylase activity . The cultivar 'Chestnut' produces an inactive a- amylase protein, Span (Hildebrand and Hymowitz , 1980b) ; 'Altona' 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 'Habaro' and introduced into the U.S. as PI 20,405 in 1906 from Kharbarovsk, USSR (Hymowitz et al ., 1977) .


Research Notes: An Allele At The Rps1 Locus From The Variety 'Kingwa', R. L. Bernard, C. R. Cremeens Apr 1981

Research Notes: An Allele At The Rps1 Locus From The Variety 'Kingwa', R. L. Bernard, C. R. Cremeens

Soybean Genetics Newsletter

Four genes at the sarae locus affecting reaction to phytophthora root rot have been previously identified : rps1, Rps1, Rps1b, Rps1c. As part of our breeding effort to create adapted varieties with resistance from diverse sources we selected the variety ' Kingwa ' which had been reported by Athow et al. (1974) to be r esistant to several races of the phytophthora- rot organism . We used it as a donor parent in backcrossing programs with the varieties 'Clark' (Group IV), ' Corsoy '(Group II ), 'Wells' (Group II), and 'Williams' (Group III) .


Research Notes: Evidence Of A Major Gene Cont Rollin G The Resistance To Race 5 Of Cercospora Sojina, H. R. Boerma, D. V. Phillips Apr 1981

Research Notes: Evidence Of A Major Gene Cont Rollin G The Resistance To Race 5 Of Cercospora Sojina, H. R. Boerma, D. V. Phillips

Soybean Genetics Newsletter

Phillips and Boerma (1981) identified race 5 of Cercospora sojina Hara causing frogeye leafspot, in 1978. Many commonly grown soybean cultivars were found to be susceptible to race 5. A study was initiated in 1979 to determine the inheritance of resistance to race 5.


Research Notes: Alteration In Seed Oil Combustibility By A Soybean Chlorophyll Mutant, Absalom F. Williams Apr 1981

Research Notes: Alteration In Seed Oil Combustibility By A Soybean Chlorophyll Mutant, Absalom F. Williams

Soybean Genetics Newsletter

Crop farmers are understandably interested in use of vegetable products as petroleum substitutes. Much of this interest now centers around fuels for internal combustion engines . Use of "raw" or slightly modified seed oils as diesel fuel is attractive for a number of reasons: 1) oil extraction is a rather simple , straight-forward process; 2) the high-protein by-products are already being used in commercial animal feed supplements ; and 3) energy and dollar cost balances are easily calculated, and seem to favor on-farm processing .


Research Notes: Development Of Cyst Nematode On Different Soybean Varieties, S. C. Anand Apr 1981

Research Notes: Development Of Cyst Nematode On Different Soybean Varieties, S. C. Anand

Soybean Genetics Newsletter

Soybean cyst nematode (SCN) has emerged as one of the most serious pests of soybeans. Over 80% of the cultivable area in southeast Missouri is infested with this organism . Several varieties resistant to SCN race 3 have been developed and released .


Research Notes: Breeding Soybean Varieties For The Northern India, Hari Har Ram, Pushpendra, Kamendra Singh, V. D. Verma Apr 1981

Research Notes: Breeding Soybean Varieties For The Northern India, Hari Har Ram, Pushpendra, Kamendra Singh, V. D. Verma

Soybean Genetics Newsletter

Soybean has been under cultivation in low hills of Kumaon and Garhwal regions of the Himalayas and the foot hills for ages. However, the old varieties were generally late , had viny growth habit, freely shattering pods and gave low yields. The crop got tremendous boost with the start of soybean breeding program in 1968 at this university .


Research Notes: Genotype Response To Soybean Cyst Nematodes In Different Soil Sources, S. C. Anand, G. S. Brar Apr 1981

Research Notes: Genotype Response To Soybean Cyst Nematodes In Different Soil Sources, S. C. Anand, G. S. Brar

Soybean Genetics Newsletter

Soybean cyst nematode was first observed in North Carolina as a pest on soybeans in 1954. Within a few years, it was reported from Virginia, Tennessee, Arkansas, Missouri and Illinois. This necessitated the screening of the soybean germplasm, which lead to the discovery of the following lines carrying resistance to SCN .


Announcement, Soybean Genetics Newsletter Apr 1981

Announcement, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: A New Recurrent Selection Scheme Incorporating Genetic Male Sterility, S. K. St. Martin Apr 1981

Research Notes: A New Recurrent Selection Scheme Incorporating Genetic Male Sterility, S. K. St. Martin

Soybean Genetics Newsletter

The use of genetic male sterility to facilitate recurrent selection in soybeans has been discussed by Brim and Stuber (1973), Fehr and Ortiz (1975), Kenworthy and Brim (1979) and Brim and Burton (1979). A problem with the selection schemes that have been presented is the occurrence of male- sterile segregates in the yield-test plots and the consequent reduction of precision in measuring yield. In the proposed scheme (Table 1), male sterility is employed to recombine selected lines, but tested material consists of homozygous fertile plants.


Research Notes: Amylase And Acid Phosphatase Genotypes Of Glycine Max, Glycine Soja And Neonotonia Wightii, Y. T. Kiang, M. B. Gorman, Y. C. Chiang Apr 1981

Research Notes: Amylase And Acid Phosphatase Genotypes Of Glycine Max, Glycine Soja And Neonotonia Wightii, Y. T. Kiang, M. B. Gorman, Y. C. Chiang

Soybean Genetics Newsletter

Three amylase loci, Am-1, Am-2 , and Am-3, have been identified by electrophoresis (Gorman and Kiang , 1978) . The activity of amylase at Am-1 and Am-2 is very weak, and that at Am-3 is much str onger. Based on heat lability and chemical reaction, Reiss (1978) concluded Am-1 and Am- 2 represent α - amylase and Am-3 β-amylase .


Research Notes: New Races Of Cyst Nematode, S. C. Anand, G. S. Brar Apr 1981

Research Notes: New Races Of Cyst Nematode, S. C. Anand, G. S. Brar

Soybean Genetics Newsletter

Physiological strains of soybean cyst nematode (SCN) were first reported by Ross (1962). Later a new biotype was observed in Arkansas (Riggs et al ., 1968). The SCN pathotypes then known were classified into four races based on their ability to reproduce on a set of soybean differentials (Golden et al. , 1970) .


Research Notes: Reaction To Peanut Mottle Virus In Plant Introductions Of Maturity Groups 00 Through Iv, G. R. Buss, C. W. Roane Apr 1981

Research Notes: Reaction To Peanut Mottle Virus In Plant Introductions Of Maturity Groups 00 Through Iv, G. R. Buss, C. W. Roane

Soybean Genetics Newsletter

The results of screening the soybean plant introductions in Maturity Groups II, III, and IV have been reported by Shipe et al. (1979) . The results of evaluating the earlier maturity groups are reported here. Plant introductions that became available after 1976 have not been screened.


Research Notes: Performance Of Lines From Four Generations Of A Backcrossing Program Involving Glycine Max And G. Soja, Gai Jungyi, W. R. Fehr, R. G. Palmer Apr 1981

Research Notes: Performance Of Lines From Four Generations Of A Backcrossing Program Involving Glycine Max And G. Soja, Gai Jungyi, W. R. Fehr, R. G. Palmer

Soybean Genetics Newsletter

We are interested in the possibility of using Glycine soja as a source of genes for improving cultivars of Glycine max. However, some characteristics in G. soja , such as low yield, vining, l odging, shattering, non-defoliation at maturity, poor seed quality, and non-yellow seed coat color are not acceptable in a cultivar. The purpose of our study is to explore the performance of these characters in lines derived from a backcrossing program in which G. soja is the donor parent .


Front Matter, Soybean Genetics Newsletter Apr 1981

Front Matter, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Pollination Study On Three Varieties Of Soybeans Using Honeybees And Leafcutter Bees, L. L. Hallman, L. H. Edwards Apr 1981

Research Notes: Pollination Study On Three Varieties Of Soybeans Using Honeybees And Leafcutter Bees, L. L. Hallman, L. H. Edwards

Soybean Genetics Newsletter

Soybeans are known to exhibit a high degree of flower abortion . Schaik and Probst (1958) noted that a large number of flowers open but drop off without ever forming pods . They also noted definite physical differences between shed ovules and viable ones.


Research Notes: Study On Biological Measures Of Environment And Its Implications On The Physical Limits To Seed Yield And Other Developmental Traits In Soybean, V. P. Gupta, I. K. Garg, N. D. Rana Apr 1981

Research Notes: Study On Biological Measures Of Environment And Its Implications On The Physical Limits To Seed Yield And Other Developmental Traits In Soybean, V. P. Gupta, I. K. Garg, N. D. Rana

Soybean Genetics Newsletter

Since adaptation of soybean and its dependence on various geographical and climatological factors has been a subject of debate (Byth , 1976 ; Summerfield and Minchin, 1976; Whigham , 1976), therefore, in the present study an attempt has been made to measure the environment biologically and to discuss the same in the light of physical limits of environment. Materials and methods : The experimental material consisted of 40 entries, representing 36 F4-derived lines of an inter-varietal cross , two parents involved in this cross, Pb1 and D60-9647, and two standard varieties, ' Lee' and 'D. S. 73-8'. The F4-derived lines were selected out of the 74 ...


Research Notes: Soybean Linkage Tests With Ms2, J. W. Keaschall, J. E. Specht, J. H. Williams Apr 1981

Research Notes: Soybean Linkage Tests With Ms2, J. W. Keaschall, J. E. Specht, J. H. Williams

Soybean Genetics Newsletter

In the last decade, at least four independently inherited, nuclear recessive genes for male sterility (ms1 , ms2 , ms3, ms4) in soybeans have been discovered (Brim and Young , 1971; Bernard and Cremeens , 1974; Palmer, 1979; Palmer et al., 1980). The successful exploitation of genetic male sterility in soybean breeding programs requires that male-sterile plants be readily distinguishable from male-fertile sibs . At present, soybean male-steriles are conveniently distinguishable from male- fertile sibs only after pod development, when the reduced pod set and delayed physiologic maturity of malesterile plants become evident.


Research Notes: Potential Of Exotic Soybeans In The Sub-Montane Region Of Himachal Pradesh (India), N. D. Rana, Gopi Chand Apr 1981

Research Notes: Potential Of Exotic Soybeans In The Sub-Montane Region Of Himachal Pradesh (India), N. D. Rana, Gopi Chand

Soybean Genetics Newsletter

Himachal Pradesh is a hilly state of Northern India , with its global location between 75°45' - 79°04 ' E longitude and 30°22' - 33°12' N latitude. In this part of the country, soybean is indigenously grown as a rainy season crop up to an altitude of 1800 m above mean sea level . The indigenous soybean comprise small seeded, twining type low- yielding varieties.


Quarantine Restrictions, Soybean Genetics Newsletter Apr 1981

Quarantine Restrictions, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.