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Effect of aluminium on Pinus sylvestris seedlings mycorrhizal with aluminium-tolerant and aluminium-sensitive strains of Suillus luteus

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Rudawska M., Kieliszewska-Rokicka B., Leski T.

Dendrobiology

2000

tom 45

Mycorrhizal syntheses of pine seedlings were conducted with Suillus luteus (L.) S.F. Gray, a strain No 14 characterised by high tolerance to Al3+ ions and a strain No 62, sensitive to aluminium. The experiment was performed as a semi-sterile culture in a peat-perlite medium with Al3+ ion concentration of 11 mM. Abundant coralloid and cluster mycorrhizas of S. luteus were formed on roots of the inoculated plants at the beginning of the experiment. Aluminium treatment limited mycorrhizal morphotypes to single and dichotomous and significantly reduced the total number of mycorrhizal tips but had no effect on extramatrical mycelium development in the potting substrate. Al treatment did not affect growth of the above-ground part of the tested plants but significantly reduced root growth of mycorrhizal seedlings. The effect of Al on the internal nutrient status was variable and not very much pronounced. A considerable amount of Al was absorbed by the roots and translocated to the shoots. Mycorrhiza formation with both strains of S. luteus did not prevent Al3+ translocation to the upper parts of the tested seedlings. The results suggest that low pH and high Al availability may harmfully influence mycorrhizal symbiosis of Scots pine (Pinus sylvestris L.) by anega tive effect on fine-root production and fewer short root tips available for colonisation rather than through a direct negative effect of Al3+ ion concentrations on extramatrical mycelium in the soil.

Ograniczanie wyników

1 Dendrobiology

1 Kieliszewska-Rokicka B.

1 Leski T.

1 Rudawska M.

1 2000

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Effect of aluminium on Pinus sylvestris seedlings mycorrhizal with aluminium-tolerant and aluminium-sensitive strains of Suillus luteus