Iron nutrition dynamics - Differences between calcicole and calcifuge plants

Research output: ThesisDoctoral Thesis (compilation)

Abstract

One third of the earth´s soils is calcareous. Calcifuge plants are excluded from these soils, and one of the main causes is Fe deficiency, as Fe solubility in calcareous soil is very low.

A lack of Fe lowers chlorophyll content, visible as yellowing of leaves, called chlorosis. It is demonstrated that the main cause of chlorosis in calcifuges is that a large part of the Fe in their leaf tissues is immobilized in a form that is not metabolically 'active', which is not the case in calcicole plants adapted to growth on such soils. The Fe fraction in leaves responsible for chlorophyll synthesis may be Fe2+ and can be extracted by synthetical chelators. 1,10-phenanthroline extractable Fe correlates well with degree of chlorosis. An additional cause of chlorosis in some calcifuges is a decreased Fe uptake by the root. Phosphorus concentration in the leaf tissue does not seem to have an influence on metabolically 'active' Fe, though phosphate addition to the soil may aggravate chlorosis. Studied were also other conditions of possible importance to calcicole-calcifuge behaviour, such as differences among plants in compartmentation of Fe between shoots, roots and the soil/root interface, as well as allocation of Fe and other plants nutrients to plant seeds.

Iron immobilization in the tissue is ecologically important to the calcicole-calcifuge behaviour of plants, as it might decrease vitality in calcifuges and exclude them from calcareous soil.

Details

Authors
  • Angelika Zohlen
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ecology

Keywords

  • 10-phenanthroline, 1, chlorophyll, plaque, root, leaf, immobilization, plants, calcifuge, Iron, calcicole, Plant ecology, Växtekologi
Original languageEnglish
QualificationDoctor
Awarding Institution
Supervisors/Assistant supervisor
  • [unknown], [unknown], Supervisor, External person
Award date2000 Apr 20
Publisher
  • Department of Ecology, Lund University
Print ISBNs91-628-4107-6
StatePublished - 2000

Bibliographic note

Defence details Date: 2000-04-20 Time: 10:00 Place: Blå hallen, Ekologihuset External reviewer(s) Name: Abadía, Javier Title: Dr Affiliation: Dept. of Plant Nutrition, Estación Experimental Aula Dei (CSIC), Zaragoza, Spain --- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Plant Ecology and Systematics (Closed 2011) (011004000)