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The induced resistance response of carrot root slices to heat killed conidia and cell free germination fluid of botrytis cinerea 2. nuclear migration nucleolar volume and uptake of tritiated uracil



The induced resistance response of carrot root slices to heat killed conidia and cell free germination fluid of botrytis cinerea 2. nuclear migration nucleolar volume and uptake of tritiated uracil



Annals of Botany 49(6): 859-872



Of the nuclei in the cells of the upper 4 layers of carrot slices treated with heat-killed conidia of B. cinerea for 6 h followed by inoculation with live spores for 18 h, 68% migrated to the cell face nearest to the treated surface, compared with 46% in cells of control slices showing a wound-healing response only. Nucleolar volumes in the surface cell layers of control slices increased from a mean of 1.0 .mu.m3 to 3.8 .mu.m3 over 24 h, and in 'indcued' slices to 7.28 .mu.m3. Using a 40 min pulse of [5-3H]uracil, there was an increase within 15 h of slicing in the number of labeled nuclei in cells from control slices undergoing healing. Within 8 h after treatment of slice surfaces with heat-killed conidia, there was an accelerated incorporation of label into 'nuclear' RNA. Slices from roots cold-stored for 12 mo. failed to show an induction response and nucleolar volumes did not increase more than in control slices. These results are discussed in relation to active defense mechanisms in plant tissue.

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