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Alleviation of salt stress by arbuscular mycorrhizal in zucchini plants grown at low and high phosphorus concentration

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Abstract

With the aim of determining whether the arbuscular mycorrhizal (AM) inoculation would give an advantage to overcome salinity problems and if the phosphorus (P) concentration can profoundly influence zucchini (Cucurbita pepo L.) plant responses to AM, a greenhouse experiment was carried out with AM (+AM) and non-AM (−AM). Plants were grown in sand culture with two levels of salinity (1 and 35 mM NaCl, giving electrical conductivity values of 1.8 and 5.0 dS m−1) and P (0.3 and 1 mM P) concentrations. The percentages of marketable yield and shoot biomass reduction caused by salinity were significantly lower in the plants grown at 0.3 mM P, compared to those grown at 1 mM P. However, even at high P concentration, the absolute value of yield and shoot biomass of +AM zucchini plants grown under saline conditions was higher than those grown at low P concentration. The +AM plants under saline conditions had higher leaf chlorophyll content and relative water content than −AM. Mycorrhizal zucchini plants grown under saline conditions had a higher concentration of K and lower Na concentration in leaf tissue compared to −AM plants. The P content of zucchini leaf tissue was similar for +AM and −AM treatments at both low and high P concentrations in the saline nutrient solution. The beneficial effects of AM on zucchini plants could be due to an improvement in water and nutritional status (high K and low Na accumulation).

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Authors and Affiliations

  1. Dipartimento di Geologia e Ingegneria Meccanica, Naturalistica e Idraulica per il Territorio, Università della Tuscia, 01100, Viterbo, Italy

    Giuseppe Colla, Youssef Rouphael & Mariateresa Cardarelli

  2. CRA - Istituto Sperimentale per la Nutrizione delle Piante, 00159, Rome, Italy

    Monica Tullio, Carlos Mario Rivera & Elvira Rea

Authors
  1. Giuseppe Colla
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  2. Youssef Rouphael
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  3. Mariateresa Cardarelli
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  4. Monica Tullio
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  5. Carlos Mario Rivera
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  6. Elvira Rea
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Correspondence to Giuseppe Colla.

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Colla, G., Rouphael, Y., Cardarelli, M. et al. Alleviation of salt stress by arbuscular mycorrhizal in zucchini plants grown at low and high phosphorus concentration. Biol Fertil Soils 44, 501–509 (2008). https://doi.org/10.1007/s00374-007-0232-8

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  • DOI: https://doi.org/10.1007/s00374-007-0232-8

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