Coïc Y, Lesaint C
Ann Nutr Aliment. 1980;34(5-6):929-36.
Nitrate accumulation in the plant represents the difference between nitrate absorption and their use. The absorption depends essentially on the available nitrate supply to the plant. We can distinguish two sources of nitric nutrition: mineral nitrogen fertilising of the crop under consideration, and mineralization of the soil organic nitrogen. While the former is directly dependent on us, the latter can hardly be controlled in terms of quantity as well as timing of the supply. On the basis of an example it is shown that the latter source of supply, as compared to mineral nitrogen fertilizing, sometimes leads to an abnormal accumulation of nitrates when the time of supply (mineralization) is not in conformity with the crop requirements during the corresponding period. The use of nitrates obviously depends on the specific physiology and the conditions affecting plant nutrition. We think that nitrate accumulation in the leaves is linked to the relative importance of nitrate metabolism in the roots and in the leaves. The tendency of various plant component to accumulate nitrates is also discussed on the basis of a few examples.
植物中硝酸盐的积累代表了硝酸盐吸收与利用之间的差异。吸收主要取决于植物可获得的硝酸盐供应。我们可以区分两种氮素营养来源：所考虑作物的矿物氮肥施用，以及土壤有机氮的矿化。虽然前者直接取决于我们，但后者在供应数量和时间方面几乎难以控制。通过一个例子表明，与矿物氮肥施用相比，当供应时间（矿化）与相应时期作物需求不一致时，后一种供应来源有时会导致硝酸盐异常积累。硝酸盐的利用显然取决于特定的生理学以及影响植物营养的条件。我们认为叶片中硝酸盐的积累与根和叶中硝酸盐代谢的相对重要性有关。还基于一些例子讨论了各种植物组分积累硝酸盐的趋势。
