Population size of Clavibacter michiganensis subsp.
sepedonicus in potato cv Russet Burbank and plant response
as affected by drought were assessed in a greenhouse
experiment. Water deficit stress and no stress treatments,
and inoculum densities of 0 or 2 X 10��� cfu C. m.
sepedonicus/seed piece were arranged factorially. Stem
populations of C. m. sepedonicus were significantly lower
in the water deficit stress treatment compared to the non-stressed
treatment at every sampling date in both
experiments. In seven of the eight harvests the number of
C. m. sepedonicus cells/g of stem tissue for the water
deficit stress treated, infected plants was a factor of 10
lower than the non-stressed treatment. Foliar symptoms of
bacterial ring rot were not observed, but symptoms
developed in tubers. Compared to the noninoculated control
inoculum reduced aerial biomass from 12 to 21% and tuber
yield from 15 to 38% in samples taken four times after the
drought was terminated. Reduction of these same variables
due to water deficit stress ranged from 17 to 21% and 15 to
41%, respectively, compared to the non-stressed control.
Therefore, both water deficit stress and C. m. sepedonicus
had similar effects on growth and tuber yield of potato. / Graduation date: 1995
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/35167 |
| Date | 31 May 1994 |
| Creators | Crabtree, Kristine L. |
| Contributors | Powelson, Mary L. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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