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Soybean Genetics Newsletter

Abstract

Chief', a very tall Maturity Group IV variety, was used as a donor parent in backcrossing to 'Clark' to transfer Np (a gene for high phosphorus tolerance). In the field in 1963, I grew progenies from 40 selected Np F2 plants from Clark BC5 and was surprised to see 2 of the progenies uniformly very tall and 3 of them segregating approximately 1/4 tall plants. The Np gene appears to have no effect on field-grown plants in normal soils.

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