Relationships between environmental factors and level of mycorrhizal infection of citrus on four islands in the Eastern Caribbean

Authors

  • Stan Michelini Fruit Experiment Station for the Caribbean, Lascelles, St James, Barbados
  • Stan Nemec Fruit Experiment Station for the Caribbean, Lascelles, St James, Barbados
  • Louis E. Chinnery Department of Biology, The University of the West Indies, PO Box 64, Bridgetown, Barbados

Keywords:

Vesicular-arbuscular mycorrhizae, pH, Calcium, Boron, Rainfall· Barbados, Dominica, Grenada, St Lucia

Abstract

Citrus root and soil samples were collected from the Caribbean islands of Barbados, Dominica, Grenada, and St Lucia. The roots were examined for the presence of vesicular-arbuscular mycorrhizal (VAM) fungi and the soil samples analysed to determine pH; percentage of organic matter; and Ca, Mg, K, N, P, S, B, Cu, Fe, Mn, and Zn contents. The age of the trees sampled, the altitude of each site, and its annual rainfall were also recorded. The significant correlations found between measures of VAM fungal infection and site characteristics varied between islands. For each island, multiple regression equations were developed to predict levels of VAM fungal colonization of the roots on the basis of site characteristics. Plant health and degree of V AM fungal infection were related; the healthiest plants were the most highly colonized.

Issue

Section

Research Papers