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11. Genetic Analyses of Soybean Genotypes Resistant to Soybean Cyst Nematode Race 5

Author

Anand, S. C. and Rao‐Arelli, A. P.

Abstract

All soybean [Glycine max(L.) Merr.] cultivars currently grown in the USA are susceptible to soybean cyst nematode (SCN), Heterodera glycinesIchinohe, Race 5. Soybean plant introductions (PIs) with resistance to SCN Race 5 have been identified, but there is very little information on their genetic analyses for resistance. Our objectives were to determine inheritance of resistance in three PIs for reaction to SCN Race 5, and to evaluate five resistant PIs for their genetic relationship to SCN resistance. The F2plants and F3families from nine different crosses among resistant (R) and susceptible (S) genotypes were evaluated in the greenhouse. Each seedling was inoculated with about 1000 eggs and juveniles of SCN Race 5. Plant roots were washed after 30 d and white females enumerated. Based on the index of parasitism (IP) F2plants and F3progenies were categorized as resistant, susceptible, or segregating. The chisquare test was applied to determine goodness of fit between observed and expected genetic ratios. The segregation data from crosses ‘Peking’ (R) ✕ PI 88788(S), PI 438489B(R) ✕ PI 88788(S), and PI 90763(R) ✕ ‘Forrest’(S) indicated that resistance in Peking and PI 90763 was conditioned by two recessive genes each, whereas PI 438489B had one recessive gene. Crosses between resistant parents, Peking with PI 90763, PI 404166, and PI 84751 have segregated for resistance indicating that genes in Peking compared to other parents are located at different loci. Lack of segregation in crosses of PI 90763(R) ✕ PI 404166(R), Peking(R) ✕ PI 438489B(R) and PI 90763(R) ✕ PI 438489B(R) indicated that the resistance in these parents was controlled by alleles at the same locus. These results showed that there was at least one gene for resistance different in Peking, PI 90763, and PI 404166. Intercrossing these sources of different genes for resistance to SCN Race 5 should result in germplasm with potentially higher levels of resistance. This information will assist breeders in selecting resistant sources to SCN Race 5 for cultivar development.

Published
1989
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32. Registration of S01-9269 Soybean Germplasm Line Resistant to Soybean Cyst Nematode with Seed Oil Low in Saturates.

Author

Shannon, J. G., Sleper, D. A., Arelli, P. R., Burton, J. W., Wilson, R. F., and Anand, S. C.

Subjects
SOYBEAN, SEED development, PLANT growth, FATTY acids, AGRICULTURAL research, RESEARCH institutes, PLANT development
Abstract

The article focuses on the registration of SO1-9269 soybean germplasm line resistant to soybean cyst nematode with seed oil low in saturates. Soybean germplasm line SO 1-9269 was developed and released in May 2004 by the Missouri Agricultural Experiment Station and U.S. Department of Agriculture-Agricultural Research Service. It has value as a parent in soybean improvement programs because of its broad resistance to soybean cyst nematode (SCN), Heterodera glycines Ichinohe, populations and seed oil that averages half the saturated fatty acids as conventional soybeans which average about 14 to 15% saturates. Plants of SO1-9269 have a determinate growth habit with white flowers, tawny pubescence, tan pods, and shiny yellow seed with brown hila. Broad resistance to SCN was relatively easy to recover because the final two of the three crossing cycles involved the resistant parents S93-1475 and S94-1867. Small quantities of seed for research purposes may be ob- tamed from the corresponding author for at least 5 years.

Published
2005
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