Plant growth, nutrient acquisition and mycorrhizal symbioses of a waterlogging tolerant legume (Lotus glaber Mill.) in a saline-sodic soil |
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Authors: | Rodolfo Mendoza Viviana Escudero Ileana García |
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Institution: | (1) Centro de Estudios Farmacológicos y Botánicos (CEFYBO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Serrano 669, Ciudad de Buenos Aires (C1414DEL)., Buenos Aires, Argentina;(2) Escuela de Agronomía, Universidad del Mar, Carmen 446. Cerro Los Placeres, Valparaíso, Chile |
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Abstract: | Seedlings of Lotus glaberMill., were grown in a native saline-sodic soil in a greenhouse for 50 days and then subjected to waterlogging for an additional
period of 40 days. The effect of soil waterlogging was evaluated by measuring plant growth allocation, mineral nutrition and
soil chemical properties. Rhizobiumnodules and mycorrhizal colonisation in L. glaberroots were measured before and after waterlogging. Compared to control plants, waterlogged plants had decreased root/shoot
ratio, lower number of stems per plant, lower specific root length and less allocation of P and N to roots. Waterlogged plants
showed increased N and P concentrations in plant tissues, larger root crown diameter and longer internodes. Available N and
P and organic P, pH and amorphous iron increased in waterlogged soil, but total N, EC and exchangeable sodium were not changed.
Soil waterlogging decreased root length colonised by arbuscular mycorrhizal (AM) fungi, arbuscular colonisation and number
of entry points per unit of root length colonised. Waterlogging also increased vesicle colonisation and Rhizobium nodules on roots. AM fungal spore density was lower at the end of the experiment in non-waterlogged soil but was not reduced
under waterlogging. The results indicate that L. glaber can grow, become nodulated by Rhizobium and colonised by mycorrhizas under waterlogged condition. The responses of L. glaber may be related its ability to form aerenchyma. |
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Keywords: | arbuscular-micorrhizas halomorphic soil phosphorus and nitrogen uptake waterlogging tolerant legume |
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