Partner und Internationale Organisationen
(Englisch)
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A, B, CH, CZ, D, DK, E, F, FIN, H, I, IRL, IS, N, P, PL, S, Sl, UK
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Abstract
(Englisch)
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There is increasing evidence that arbuscular mycorrhizas perform various other functions than increasing P inflow and that P nutrition may not be the major benefit that plants derive from arbuscular mycorrhizal fungi in many instances. The interactions between plant and fungus suggest essential changes in plant physiology and ecology consequent on colonization by arbuscular mycorrhizal fungi. Mycorrhical symbiosis enables plants in overcoming of biotic and abiotic stress. Various substrates were tested for raising micropropagated raspberry plantlets to be used for long-term field trials under praxis relevant conditions. The plantlets regenerating from tissue culture were inoculated with different AMF isolates during their acclimatization to the unsterile substrate. The field performance of inoculated and non-inoculated strawberries and raspberries is tested in various trials under practical conditions. Positive effects can be expected by introducing beneficial fungal isolates if the indigenous mycorrhizal fungal population in the experimental plots is of low symbiotic efficiency. The mechanisms of stress alleviation in mycorrhizal plants needs further elucidation. It is concluded that depending on kestose accumulation soluble carbohydrates of both the plant and its symbiotic fungus are affected particularly under drought. This is most noticeable with respect to glucose on the plant side and to trehalose on the fungal side. Moderate drought stress induced a conspicuous increase in the trehalose pool in the mycorrhizal roots, probably because it was accumulated by the fungal symbiont. Our results show that drought stress and the presence of a mycorrhizal fungus have a considerable effect on carbon partitioning, imino acid and amino acid accumulation in plants.
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