Multicellular living organisms and unmodified parts thereof and – Plant – seedling – plant seed – or plant part – per se – Higher plant – seedling – plant seed – or plant part
Patent
1998-04-01
1999-08-17
McElwain, Elizabeth F.
Multicellular living organisms and unmodified parts thereof and
Plant, seedling, plant seed, or plant part, per se
Higher plant, seedling, plant seed, or plant part
800260, 435415, A01H 500, A01H 510, A01H 102, C12N 504
Patent
active
059396059
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to the field of soybean breeding. In particular, the invention relates to the novel soybean cultivar CX257RR.
2. Description of Related Art
There are numerous steps in the development of any novel, desirable plant germplasm. Plant breeding begins with the analysis and definition of problems and weaknesses of the current germplasm, the establishment of program goals, and the definition of specific breeding objectives. The next step is selection of germplasm that possess the traits to meet the program goals. The goal is to combine in a single variety an improved combination of desirable traits from the parental germplasm. These important traits may include higher seed yield, resistance to diseases and insects, better stems and roots, tolerance to drought and heat, better agronomic quality, resistance to herbicides, and improvements in compositional traits.
Choice of breeding or selection methods depends on the mode of plant reproduction, the heritability of the trait(s) being improved, and the type of cultivar used commercially (e.g., F.sub.1 hybrid cultivar, pureline cultivar, etc.). For highly heritable traits, a choice of superior individual plants evaluated at a single location will be effective, whereas for traits with low heritability, selection should be based on mean values obtained from replicated evaluations of families of related plants. Popular selection methods commonly include pedigree selection, modified pedigree selection, mass selection, recurrent selection and backcrossing.
The complexity of inheritance influences choice of the breeding method. Backcross breeding is used to transfer one or a few favorable genes for a highly heritable trait into a desirable cultivar. This approach has been used extensively for breeding disease-resistant cultivars (Bowers et al., 1992; Nickell and Bernard, 1992). Various recurrent selection techniques are used to improve quantitatively inherited traits controlled by numerous genes. The use of recurrent selection in self-pollinating crops depends on the ease of pollination, the frequency of successful hybrids from each pollination, and the number of hybrid offspring from each successful cross.
Each breeding program should include a periodic, objective evaluation of the efficiency of the breeding procedure. Evaluation criteria vary depending on the goal and objectives, but should include gain from selection per year based on comparisons to an appropriate standard, overall value of the advanced breeding lines, and number of successful cultivars produced per unit of input (e.g., per year, per dollar expended, etc.).
Promising advanced breeding lines are thoroughly tested and compared to appropriate standards in environments representative of the commercial target area(s) for generally three or more years. The best lines are candidates for new commercial cultivars. Those still deficient in a few traits may be used as parents to produce new populations for further selection.
These processes, which lead to the final step of marketing and distribution, may take as much as eight to 12 years from the time the first cross is made. Therefore, development of new cultivars is a time-consuming process that requires precise forward planning, efficient use of resources, and a minimum of changes in direction.
A most difficult task is the identification of individuals that are genetically superior, because for most traits the true genotypic value is masked by other confounding plant traits or environmental factors. One method of identifying a superior plant is to observe its performance relative to other experimental plants and to one or more widely grown standard cultivars. Single observations are generally inconclusive, while replicated observations provide a better estimate of genetic worth.
The goal of plant breeding is to develop new, unique and superior soybean cultivars and hybrids. The breeder initially selects and crosses two or more parental lines, followed by repeated selfi
REFERENCES:
patent: 5084082 (1992-01-01), Sebastian
patent: 5304728 (1994-04-01), Eby
patent: 5569815 (1996-10-01), Eby
patent: 5576474 (1996-11-01), Lussenden
Allard, R.W., University of California, Davis, California. "Principles of Plant Breeding," Published by John Wiley & Sons, New York, University of California, Davis, California, pp. 50-98, 1960.
Bernard, ed., "Evaluation of Maturity Groups I and II of the U.S.D.A. Soybean Collection," pp. 1-3, 58-59, Sep. 1966.
Bernard, ed., "Evaluation of Maturity Groups III and IV of the U.S.D.A. Soybean Collection," pp. 1-3, 5a-5d, 8a-8d, 9a-9d, 14a-14d, 17a-17d, 24a-24d, and 25a-25d, Apr. 1969.
Fehr, "In: Soybeans: Improvement, Production and Uses," 2nd Edition, Manograph 16, pp. 249 and 259, 1987.
Fehr, Walter R., Iowa State Univeristy. "Principles of Cultivar Development," vol. 1 Theory and Technique and vol. 2 Crop Species, Soybean, Published by Macmillian Publishing Company, New York, pp. 360-376, 1987.
GRIN Database Entry PI438065 (Aug. 9, 1994), From The Internet http://www.ars-grin.gov.
Nickell and Bernard, "Registration of L84-5873 and L84-5932 Soybean Germplasm Lines Resistant to Brown Stem Rot," Crop Sci., 32:835, 1992.
Plant Variety Protection Certification Application 9000006.
Sneep, J. and A.J.T. Hendriksen, eds., "Plant Breeding Perspectives," Wageningen: Centre for Agricultural Publishing and Documentation, 1979.
Rieger et al. Glossary of Genetics: Classical and Molecular, Fifth Edition. Springer-Verlag, New York, pp. 192-193, 1991.
Dekalb Genetics Corporation
McElwain Elizabeth F.
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