Genotype × Environment Interactions for Specific Gravity in Diploid Potatoes

Abstract

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 × 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 cloual 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 × 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 should not result in clones that are less stable for specific

Carotenoid Biosynthesis Regulatory Mechanisms in Plants

“…For example, the Laura cultivar in Palmerston North New Zealand was found to have more intense yellow color compared to the Laura cultivar grown in Pukekohe and Lincoln both in New Zealand which is reflected by the total carotenoid content. These data support the previous claims of significant variations in the intensity of the yellow flesh across environments 24 . In a subsequent study by the same group, it was determined that the yellow flesh intensity was significantly affected by environment, with the general decreasing trend of the yellow flesh intensity in the south to north direction 24 .…”

“…These data support the previous claims of significant variations in the intensity of the yellow flesh across environments 24 . In a subsequent study by the same group, it was determined that the yellow flesh intensity was significantly affected by environment, with the general decreasing trend of the yellow flesh intensity in the south to north direction 24 .…”

Genotype × environment interactions and simultaneous selection for high oil yield and stability in rainfed warm areas rapeseed (Brassica napus L.) from Iran

“…Shukla's (1972) methods of stability (Sh-r i 2 and Sh-S i 2 ), Wricke's (1962) ecovalence (W i ) and Kang's (1988) rank-sum index (RS i ) were not significantly correlated with any of the traits. Several of the previously reported studies showed no correlation of the stability-variance statistic (Sh-r i 2 ) with seed yield in rapeseed (Brandle and Brûlé-Babel 1991), specific gravity in potatoes (Haynes et al 1995). Kang's (1988Kang's ( , 1991 indices (RS i , MRS i and YS i ) were positively correlated with each other.…”

Influence of Environmental Stress toward Carotenogenesis Regulatory Mechanism through In Vitro Model System

“…In addition, the total glycoalkaloid content of potato tubers was found greatly affected as a result of environmental changes during the growing season [14], even though there are also strong genetic effects [15,16]. Seasonal differences, growing conditions, locations, genotypes, and postharvest storage conditions are among the factors that can be significantly affecting the quality and nutritional value of potatoes [17][18][19][20]. The bioavailability of carotenoids is characterized as an intricate issue and influenced by various factors [21].…”