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Arbuscular mycorrhiza effects on water stress tolerance of four fruit trees: Balanites aegyptiaca (L.) Del., Parkia biglobosa (Jacq.) Benth., Tamarindus indica L. et Zizyphus mauritiana |
Science et changements planétaires / Sécheresse. Volume 12, Number 2, 121-7, Juin 2001, Note de recherche
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 Résumé
Article gratuit
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Author(s) : Tiby GUISSOU, Amadou Moustapha BA, Christian PLENCHETTE, Sita GUINKO, Robin DUPONNOIS |
Summary : The effects of inoculation with an arbuscular mycorrhizal (AM) fungus, Glomus aggregatum Schenck & Smith emend. Koske, on water stress tolerance in four fruit trees, Balanites aegyptiaca (L.) Del., Parkia biglobosa (Jacq.) Benth., Tamarindus indica L. and Zizyphys mauritiana Lam., was studied in a P-deficient soil (2.18 mug/g P-Bray I). AM and non-AM pots were irrigated daily to field capacity during the first 4 weeks. Then half of the AM and non-AM pots of each species were maintained at field capacity and the second half subjected to water stress (soil moisture = 12 % of the field capacity). After 20 weeks of growth, the triple interaction (mycorrhization x water stress x fruit species) was significant (p < 0.05) only for mycorrhizal dependency (MD) and mineral nutrition variables. Z. mauritiana, T. indica and P. biglobosa had the highest root colonization by G. aggregatum and total dry mass thus increased significantly, irrespective of the watering regime. G. aggregatum poorly colonized and did not stimulate total dry mass in B. aegyptiaca. This fruit tree showed the lowest MD value (17%), while Z. mauritiana showed the highest MD value (70%). Weter consumption of AM and non-AM fruit trees was independent of leaf area, irrespective of the watergin regime. Mycorrhization did not improve the water stress response index (IRS) and water-use efficiency (EUE) in any of the fruit trees. N, P, K and Mg concentrations in shoots of AM-Z. mauritiana increased under water stressed conditions more than under well watered conditions without affecting IRS and EUE. These results showed that G. aggregatum stimulated growth and mineral nutrition of fruit trees but did not improve their stress tolerance. |
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