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Effects of some pure and mixed Frankia strains on seedling growth in different Alnus species

D. PRAT
Plant and Soil
Vol. 113, No. 1 (January (I), 1989), pp. 31-38
Published by: Springer
Stable URL: http://www.jstor.org/stable/42937727
Page Count: 8
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Effects of some pure and mixed Frankia strains on seedling growth in different Alnus species
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Abstract

In greenhouse experiments plants of eight Alnus species, from various parts of the world, and from different taxonomic sections, were inoculated with three Frankia strains in order to show any possible interaction. Mixtures in equal parts of these Frankia strains were also tried. The growth of inoculated plants was significantly higher than of the controls, with one of the three strains being superior. Mixtures of strains generally provided higher growth than the best individual strain. No interaction between Frankia strains and Alnus species was detected in the young plants 60 days after inoculation. Three clones of Alnus glutinosa were inoculated with the same pure cultures of Frankia, without producing any interaction. Inoculation time was studied in one clone and one progeny of Alnus glutinosa. The best results were obtained with the earlier inoculation (at sowing for the progeny and at transfer to soil for the in viro-propagated clone). The results are discussed in terms of nursery practice and field experiments for selection in breeding programmes.

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