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Genotype x Environment Interactions for Specific Gravity in Diploid Potatoes

USDA-ARS, Vegetable Laboratory, Beltsville, MD 20705-2350
USDA-ARS, Vegetable Laboratory, Presque Isle, ME 04769
Dep. of Agronomy, Louisiana State Univ., Baton Rouge, LA 70803

^* Corresponding author.

In a clonally propagated crop, such as potato (Solanum tuberosum L.), an estimate of genetic variance as a proportion of the total phenotypic variance (broad-sense heritability) is desirable. Because of its importance to the processing industry, tuber specific gravity has been widely studied. Earlier estimates of narrow-sense heritability for specific gravity in a diploid hybrid population of Solanum phureja x Solanum stenotomum (PHU-STN) were moderate. The purpose of this study was to identify stable, high specific gravity clones for future population improvement efforts and to estimate broad-sense heritability based on clonal means in this PHU-STN population. From 1990 to 1992, 72 diploid hybrid PHU-STN clones were grown in replicated field plots in Presque Isle, ME, and evaluated for specific gravity. There were significant differences among clones. There was also a significant replication (year) effect and clone x year interaction. From the analysis of variance on specific gravity, broad-sense heritability based on clonal means was estimated as 0.66, with a 95% confidence interval of 0.50 to 0.78. Stability-variance statistics calculated for each clone were used to identify stable high specific gravity clones. There was no correlation between average specific gravity during 3 yr and the stability-variance statistic, indicating that selecting for high specific gravity.

Received for publication September 24, 1993.

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