On leave from Escola Superior de Agricultura de Lavras, 372000-Lavras, MG-Brazil.
Stimulation of vesicular-arbuscular mycorrhiza formation and growth of white clover by flavonoid compounds
Article first published online: 28 APR 2006
Volume 118, Issue 1, pages 87–93, May 1991
How to Cite
SIQUEIRA, J. O., SAFIR, G. R. and NAIR, M. G. (1991), Stimulation of vesicular-arbuscular mycorrhiza formation and growth of white clover by flavonoid compounds. New Phytologist, 118: 87–93. doi: 10.1111/j.1469-8137.1991.tb00568.x
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- (Received 31 August 1990; accepted 13 December 1990)
- VA mycorrhiza;
- mycorrhizal fungi;
- root micro-organisms;
- phenolic compounds;
The effects of flavonoid compounds on VA mycorrhiza root colonization and growth of white clover (Trifolium repens L.) plants under growth chamber conditions are reported. The isoflavonoids, formononetin and biochanin A, previously identified from clover roots, stimulated colonization and growth of clover, while several other flavonoid compounds were inactive when tested at concentrations of 5 mg 1−1. The flavone, chrysin, when applied at concentrations higher than those tested for formononetin and biochanin A, also increased root colonization and plant growth. The stimulatory effects of the isoflavonoids on plant growth were mediated by VA mycorrhizal fungi and were dependent on concentration, period of growth and soil spore density. Maximum responses were found when 5 mg 1−1 solutions were applied to soil containing 2 to 4 VA mycorrhiza spores g−1 of soil. These results may provide insights on the molecular mechanisms of host-fungus interaction and for the development of technology to exploit the potential of the indigenous VA mycorrhizal fungi in field soil.