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. / Graduation date: 1990
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27038 |
| Date | 07 July 1989 |
| Creators | Zhang, Peifang |
| Contributors | Holmes, Zoe Ann |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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