The Biology of Mycorrhiza in the Ericaceae

Abstract

SUMMARY Translocation of nutrients is demonstrated in mycorrhiza of ericaceous plants. [14C]glucose and [32P]orthophosphate are translocated over limited distacnes by the endophyte in pure culture. 32P is translocated to mycorrhizal host plants over distances and at rates which are related to the size of the host plants. Photosynthates from the higher plant are translocated from the roots to the external mycelium of the endophyte. The possible ecological significance of these findings is discussed.

THE RESPONSE OF MYCORRHIZAL AND NONMYCORRHIZAL ROOTED CUTTINGS OF HEATHER (CALLUNA VULGARIS (L.) HULL) TO VARIATIONS IN NUTRIENT AND WATER REGIMES

“…The accumulation of phosphorus in mycorrhizal roots of Calluna is similar to that found by Pearson (1971) using •'^P and provides a parallel with the enhanced uptake of phosphorus by ectotrophic mycorrhizas (Harley, 1969). The accumulation of phosphorus in mycorrhizal roots at the expense of shoots (Pearson, 1971) makes it difficult to see how growth can be enhanced unless the phosphorus is made available to the shoot. This could be accomplished by the transfer of phosphorus from the mycorrhizal fungus to the host.…”

“…The accumulation of phosphorus in mycorrhizal roots at the expense of shoots (Pearson, 1971) makes it difficult to see how growth can be enhanced unless the phosphorus is made available to the shoot. This could be accomplished by the transfer of phosphorus from the mycorrhizal fungus to the host.…”

“…This could be accomplished by the transfer of phosphorus from the mycorrhizal fungus to the host. Smith (1966) has demonstrated such a transfer with an orchid endophyte, whilst Pearson (1971) has found that ^^P moves from root to shoot when a plant is given a further application of non-radioactive phosphorus. Alternatively, phosphorus could be supplied by the digestion of the fungus.…”

THE BIOLOGY OF MYCORRHIZA IN THE ERICACEAE V. THE EFFECTS OF MYCORRHIZAL INFECTION, SOIL TYPE AND PARTIAL SOIL‐STERILIZATION (BY GAMMA‐IRRADIATION) ON GROWTH OF CRANBERRY (VACCINIUM MACROCARPON AIT.)

“…Mycelium of the endophyte, originally isolated from roots of V. macrocarpon by Pearson and Read (1973), was grown in Pearson's (1971) medium. After 10 days' growth at 25° C, mycelium was centrifuged, washed with sterile water and macerated.…”

THE BIOLOGY OF MYCORRHIZA IN THE ERICACEAE IV. THE EFFECT OF MYCORRHIZAL INFECTION ON UPTAKE OF 15N FROM LABELLED SOIL BY VACCINIUM MACROCARPON AIT.

“…of soil on a bed of 50 ml 0.5% water agar. To obtain mycorrhizal seedlings, the soil was inoculated with two drops [c. 76 /ig dry wt) of a suspension of the endophyte, originally isolated from V. macrocarpon (Pearson and Read, 1973) and prepared as described by Pearson (1971) from cultures grown on water agar. In other experiments, the soil was inoculated with spores from cultures of Trichoderma or Aspergillus.…”