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Near-Isogenic Analyses of Soybean Pubescence Genes¹

Soybean [Glycine max (L.) Merr.] pubescence morphology can be altered by various qualitative genes. Such alterations have potential for the development of cultivars adapted to unique production environments. Near-isogenic lines of ‘Clark’ and ‘Harosoy’, which possessed alleles (singly and in combination) for pubescence morphology (i.e., pa₁, pa₂, Pb, pc, Pd₁, Pd₂, Ps, Ps², and Pd₁), were evaluated for their agronomic performance in irrigated vs. nonirrigated experiments for 2 years. Analyses of the data in terms of "allelic means" indicated that the pa₁pa₂ combination (appressed pubescence) consistently enhanced seed yield in the Clark genetic background, but not in Harosoy. The Pd₁ allele (dense pubescence) had little effect on seed yield in Harosoy, but reduced seed yield in Clark. The latter results contrast with previous studies where the Pd₁ allele increased seed yield in Harosoy, but had no effect in Clark. All other alleles were either deleterious, or at most neutral, in their effects on soybean yield. Only the Pd₁ and Pd₂ alleles resulted in greater plant height; the other alleles had either no effect or reduced plant height. The Pd₁ and pa₁pa₂ alleles may thus offer adaptive advantages in cultivars for certain production environments.

Key Words: Glycine max (L.) Merr. • Seed yield • Maturity • Plant height • Lodging • Seed quality • 100-seed weight • Cultivar development • Plant population

² Associate professor, professor,and graduate student, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication May 11, 1983.

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