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Chalara elegans (Nag Raji and Kendrick) causes root rot of tobacco with the same symptoms but dif... more Chalara elegans (Nag Raji and Kendrick) causes root rot of tobacco with the same symptoms but différent intensities on two cultivars of N. tabacum, one sensible (Sota 50) and the other résistant (Kentucky 170). Résistance or sensibility of the cultivars is expressed in calli. The type of auxins (2,4-D, AIA, NAA) influence the disease rate of the calli. However, calli from the résistant cultivar are less attacked than those from the sensible cul¬ tivar when grown with the same concentration of 2,4-D or AIA, but not with NAA. The concentration of soluble aminoacids is higher in calli than in roots, there is no corrélation between the amount of aminoacids in the tissue, except for the aromatic ones, and the résistance of the tissue to C. elegans. The résistant cultivar contains more soluble phenolic compounds in roots and calli than the sensible cultivar. After infection, the résistant cultivar accumulâtes more phenolic compounds, or looses less, than the sensible cultivar. The same ma...
Chalara elegans (Nag Raji and Kendrick) causes root rot of tobacco with the same symptoms but dif... more Chalara elegans (Nag Raji and Kendrick) causes root rot of tobacco with the same symptoms but différent intensities on two cultivars of N. tabacum, one sensible (Sota 50) and the other résistant (Kentucky 170). Résistance or sensibility of the cultivars is expressed in calli. The type of auxins (2,4-D, AIA, NAA) influence the disease rate of the calli. However, calli from the résistant cultivar are less attacked than those from the sensible cul¬ tivar when grown with the same concentration of 2,4-D or AIA, but not with NAA. The concentration of soluble aminoacids is higher in calli than in roots, there is no corrélation between the amount of aminoacids in the tissue, except for the aromatic ones, and the résistance of the tissue to C. elegans. The résistant cultivar contains more soluble phenolic compounds in roots and calli than the sensible cultivar. After infection, the résistant cultivar accumulâtes more phenolic compounds, or looses less, than the sensible cultivar. The same ma...