Original scientific paper

Rudolf Kastori ; Srbija
Novica Petrović ; Srbija

Abstract

In young maize plants, grown on a liquid nutrient medium, the effect of varying nitrate supply on the distribution of the initial and total nitrate reductase activities and on the content of nitrates and total nitrogen in particular parts of roots and shoots was studied.
With increasing nitrate concentrations in the nutrient solution, nitrate content in all analyzed plant parts increased to a significantly greater
extent than total nitrogen. The highest nitrate content in shoots was observed in the oldest laeves and, in the youngest part of root system in the nodular roots.
With sufficient nitrate supply, the initial and total nitrate reductase activities were highest in the youngest leaves and, with insufficient nitrate supply, they were highest in the oldest leaves. In the root system, both initial and total nitrate reductase activities were highest in the primary root, somewhat lower in the lateral roots and lowest in nodular roots, at all levels of nitrate supply.
The hypothesis stated by some authors that nitrate uptake and nitrate reductase activity in the root are closely correlated was not supported by our experiments.

Keywords

Hrčak ID:

159512

URI

https://hrcak.srce.hr/159512

Publication date:

31.12.1989.

Article data in other languages: croatian german

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