Summary
The factors which influence disease development greatly affect the nitrogen metabolism and water regime of the rice plant. Soluble nitrogen, mainly the amino acids, accumulates and this favours the establishment of parasitic micro-organisms. In diseased tissues the level of total-N and protein-N (per cent on dry weight) is higher than in the healthy ones. If the amount of protein-N is expressed on a total-N basis the diseased plants exhibit a lower protein content.
High nitrogen doses lead to disturbances of the growth processes and may be attributed to the accumulation of NH3. The physiological activity of the root system of susceptible and resistant rice plants exhibits marked differences, particularly in the later developmental stages. Resistant varieties, due to their highly developed root system, yielded higher amounts of bleeding sap.
As a result of excessive nitrogen nutrition the root/shoot ratio is shifted in favour of the latter and consequently the normal balance of water regime and the mineral nutrition is disturbed. In the so called “brusone years” physiological drought is observed and this leads to serious losses. The resistant varieties are more or less tolerant to the deleterious effect of physiological drought.
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Zsoldos, F. Nitrogen metabolism and water regime of rice plant affected by “brusone” disease. Plant Soil 16, 269–283 (1962). https://doi.org/10.1007/BF01381339
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DOI: https://doi.org/10.1007/BF01381339