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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen availability and susceptibility of tomato leaves to Botrytis cinerea (1999)
    Springer
    Plant and soil 210 (1999), S. 263-272 
    Details
    ISSN: 1573-5036
    Keywords: Botrytis cinerea ; Lycopersicon esculentum ; nitrogen availability ; pathogen resistance ; relative growth rate ; α-tomatine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The aim of this study was to investigate the effect of nitrogen availability on susceptibility of tomato leaves to the fungal pathogen Botrytis cinerea. Plants with varying nitrogen availability were grown by adding N daily in exponentially increasing amounts to a nutrient solution at different rates. Leaves of plants grown at low nitrogen availability had a high leaf C/N ratio (21 g g-1) and were about 2.5 times more susceptible to primary lesion formation by B. cinerea compared to plant grown at high nitrogen availability, which had a low leaf C/N ratio (11 g g-1). Leaf C/N ratio accounted for 95% of variation in susceptibility. This relationship between C/N ratio and susceptibility persisted when plants were grown with exponential P addition and optimal N supply, and was thus independent of plant growth rate or related factors. We could not explain the effect of nitrogen availability by variation in the most obvious N-based resistance compound α-tomatine because more susceptible leaves with a high C/N ratio contained more α-tomatine. These leaves also contained more soluble carbohydrates. The level of soluble carbohydrates correlated positively with susceptibility, independent of the growth method. We therefore suggest that the effect of N availability on susceptibility must be explained by variation in levels of soluble carbohydrates and speculate about the role of these carbohydrates in the infection process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004661913224
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  • 2
    Electronic Resource
    Electronic Resource
    Solubilization of rock phosphate by rape (1989)
    Springer
    Plant and soil 113 (1989), S. 155-160 
    Details
    ISSN: 1573-5036
    Keywords: Brassica napus ; Ca uptake ; cation-anion balance ; rock phosphate ; split pot experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Rape and sunflower were compared with respect to their rock phosphate mobilizing capacities, cationanion balance and uptake of Ca and NO3 at P-starvation. Rape was able to mobilize P from rock phosphate, whereas sunflower was not. When grown on a complete nutrient solution with NO3 as the only nitrogen source, both species took up more nutrient anions than cations. Withholding phosphate from the nutrient solution did not change the uptake pattern of rape, but sunflower took up more nutrient cations than anions at P-starvation, due to a strong decline in NO3 uptake. With both species, Ca uptake was not affected by phosphate in the nutrient solution. In split pot experiments, with rock phosphate supplied spatially separated from other nutrients, rape was still able to mobilize rock phosphate. A high Ca concentration had no effect on this capacity. The results indicated that in our experiments rock phosphate mobilization by rape was not associated with an excess of cation over anion uptake and neither with a high Ca uptake rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280175
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  • 3
    Electronic Resource
    Electronic Resource
    Solubilization of rock phosphate by rape (1989)
    Springer
    Plant and soil 113 (1989), S. 161-165 
    Details
    ISSN: 1573-5036
    Keywords: agar plate technique ; Brassica napus ; citric acid ; malic acid ; phosphate nutrition ; rhizosphere acidification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Local rhizosphere acidification by rape as a reaction to P-starvation was visualized by means of an agar plate technique. By means of a modification of this technique local differences in cation-anion uptake and organic acid exudation along intact roots of rape were observed for plants grown on nutrient solution with or without added P. No differences in uptake rates of K-, NO3- and Ca-ions could be detected between P-starved and P-supplied plants. However, exudation of malic and citric acid was distinctly higher in acidified root zones of P-starved plants, coinciding with higher levels of malate in the corresponding root tissue. Organic acid exudation is indicates as the cause of local rhizosphere acidification by rape as a reaction to P-starvation and as a possible mechanism of its phosphate-solubilizing capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280176
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