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Keywords:

  • Vesicular-arbuscular mycorrhizas;
  • extraradical hyphae;
  • transpiration flux

Summary

Results from experiments on clover (Trifolium pratense L.) and leek (Allium porrum L.) revealed that removal of extraradical hyphae from vesicular-arbuscular mycorrhizal (VAM) plants had a detrimental effect on transpiration flux. The advantage of comparisons between VAM plants with and without extraradical hyphae rather than between VAM and non-mycorrhizal plants is discussed in relation to this type of investigation. It is suggested that extraradical hyphae increase the root absorptive-surface area, independently of an enhanced nutrient status.