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Journal of Biological Sciences

Year: 2001  |  Volume: 1  |  Issue: 8  |  Page No.: 785 - 787

Genotype X Environment Interaction in Soybeans Grown in Oklahoma (USA) and in NWFP (Pakistan)

F. Subhan and L. H. Edwards


Fifteen genotypes of group IV and group V soybeans from the Oklahoma Soybean Variety Test were grown from 1991 to 1994 at four Oklahoma (USA) locations and in 1994 four NWFP (Pakistan) locations to investigate Genotype x Environment (GE) interactions and genotypic stability. Significant Genotype x Locations and Genotype x Location x Year (GLY) interactions was observed for seed yield. The top-yielding genotypes at Bixby were Hartwig, OK 885409, HSC 591 and Hutcheson. At Haskell the top-yielding genotypes included Hutcheson, OK 885409 and Manokin. At Chickasha and Goodwell 7 and 9 genotypes were in the top yielding group; respectively. OK 885409 was in the top-yielding group in 1991, 1992 and 1994 at Bixby, in 1991, 1993 and 1994 at Chickasha, and in all four years at Haskell. A significant Genotype x Location (GL) interaction was observed for seed yield when all eight locations (in Pakistan and the USA) were studied in 1994. Only Haskell-Mansehra and Chickasha-Mansehra showed nonsignificant Genotype x Location interactions. Combined regression analysis was also used. Genotypes OK 885409, Hutcheson, HSC 401 and Bay had nonsignificant residual mean squares but only OK 885409 and Hutcheson had b value close to one and a mean yield higher than the grand mean. These genotypes are less responsive to favorable environments, but should perform in a more predictable or stable manner.

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