Tissue magnesium and calcium affect arbuscular mycorrhiza development and fungal reproduction

A. G. Jarstfer, P. Farmer-Koppenol, David M. Sylvia

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Applications of high levels of MgSO4 resulted in reduced root colonization and sporulation by Glomus sp. (INVAM isolate FL329) with sweet potato and onion in aeroponic and sand culture, respectively. Onion shoot-Mg concentrations were elevated when a nutrient solution containing 2.6 or 11.7 mM MgSO4 was applied. Magnesium application depressed tissue-Ca levels. With lower Ca in the tissue, colonization was reduced from > 30% of root length to < 10%, and sporulation from > 1200 to ca. 200 spores per plant, 10 weeks after transplantation and the start of nutrient application. These effects on colonization and sporulation were independent of changes in tissue-P concentration. High Mg/low Ca tissue concentrations induced premature root senescence, which may have disrupted the mycorrhizal association. Our results confirm the importance of Ca for the maintenance of a functioning mycorrhiza.

Original languageEnglish (US)
Pages (from-to)237-242
Number of pages6
JournalMycorrhiza
Volume7
Issue number5
DOIs
StatePublished - Apr 4 1998

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics
  • Plant Science

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