Graduate Thesis Or Dissertation
 

The effect of drought stress on the chemical composition and distribution in Russet Burbank and AO82260-8 potatoes

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  • The effects of early season and late season drought stress on various carbohydrates, calcium and/or nitrogen content at apical, central and basal tuber locations were studied for Russet Burbank and A082260-8 potatoes. Drought stress which occurred early in the stage of tuber development appeared to have more detrimental effect than later season stress. Interactions between treatment and sampling date and variety x position x date were significant during early season stress. Generally, percent total solids increased during potato development for both varieties. The central portion of tuber had the lowest total solids. Total reducing sugar content generally decreased during potato development for both varieties with significant (P<.05) differences at early season stress due to the interaction effects of treatment x date and variety x position. No significant difference in reducing sugar at later season stress was found regardless of treatment. Variety difference in reducing sugar content occurred at the apical end. Russet Burbank had more reducing sugars than A082260-8 at this end. The exploration of fructose, glucose and sucrose individually showed the same developing pattern as total reducing sugar. Sucrose made up over 50% of the total sugars with glucose and fructose the next in order of importance. The apical end had more sucrose and glucose than the basal end. The interaction of variety and position for both nitrogen and dietary fiber may be a result of growth pattern differences in the two treatments. Total dietary fiber content was generally the highest at the basal portion for both varieties. Russet Burbank appeared to have higher total dietary fiber than A082260-8 at this end. The level of calcium in Russet Burbank was significantly higher than that in A082260-8. Basal and apical portions had higher calcium content than the central portion.
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