Genotypic differences in the uptake and distribution of radiocaesium in plants |
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Authors: | Jan Buysse Karen Van den Brande Roel Merckx |
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Institution: | (1) Prince Edward Island Department of Agriculture Fisheries and Forest, P.O. Box 1600, C1A 7N3 Charlottetown, P.E.I., Canada |
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Abstract: | The ability of endophytic bacteria to influence Erwinia carotovora var. atroseptica (Eca) growth and disease development was examined in potatoes. Bacterial populations isolated from within the tubers of five
potato (Solanum tuberosum L.) cultivars (Kennebec, Butte, Green Mountain, Russet Burbank and Sebago) showed antibiosis toward Eca in an in vitro assay.
Sebago was host to the highest percentage of bacterial isolates inhibiting Eca growth in vitro (49.5%), followed by Green
Mountain (33.3%), Kennebec (29.3%), Russet Burbank (12.9%) and Butte (1.8%). Of these, Curtobacterium luteum was the most common species. Few endophytic bacteria from Butte were inhibitory to Erwinia; all were from Pantoea agglomerans. Significantly higher populations of Erwinia-inhibiting bacteria were recovered from Kennebec (1.89 × 106 cfu fresh weight tuber tissue) as compared to the other cultivars; the lowest populations were recovered from Butte (0.01
× 106 cfu per g fresh weight tuber tissue). Published levels of cultivar disease resistance to blackleg did not correspond to actual
bacterial soft rot development (induced by Eca) in an in vivo (tuber) assay. However, bacterial soft rot development was negatively
correlated with the density of tuber populations of endophytic bacteria found able to inhibit Eca growth in vitro (R=−0.879,
p=0.05). |
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Keywords: | blackleg endophytic bacteria Erwinia host-resistance soft-rot |
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