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Effect of nitrogen nutrition on Fusarium wilt of tomato plants
Author(s) -
SARHAN A. R. T.,
BARNA B.,
KIRÁLY Z.
Publication year - 1982
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1982.tb00819.x
Subject(s) - fusarium wilt , biology , fusarium oxysporum , nitrogen , peroxidase , proline , wilt disease , nutrient , horticulture , nitrate reductase , nitrate , agronomy , botany , amino acid , enzyme , chemistry , biochemistry , ecology , organic chemistry
SUMMARY The role of nitrate‐nitrogen (NO 3 ‐N) in relation to the development of tomato wilt caused by Fusarium oxysporum f. sp. lycopersici R1 was studied. Plants receiving 284 μg/ml nitrogen in the nutrient solution exhibited the same severe wilt symptoms as the control plants in soil. Disease decreased with increasing nitrogen levels (420, 630 and 1050 μg/ml). Apparently, the plants were also less susceptible to the disease when the concentration of nitrogen was 70 μg/ml, i. e. below the optimal level (284 μg/ml). Protein content in tissues of plants grown with different amounts of nitrogen was also determined. High nitrogen levels, which decreased disease severity, increased the protein content in leaf tissues. Of 17 amino acids only proline content increased with increasing nitrogen supply. High doses of NO 3 –N decreased the phenol content and the activity of peroxidase in stem and leaf tissues of tomato plants. It is suggested that phenolic compounds and the activity of peroxidase are not significant in the resistance of tomato to Fusarlum wilt associated with high nitrogen supply.