Impacts of Inoculation with Two Species of Arbuscular Mycorrhizae on Rice (Oryza sativa L.) Growth, Phosphorus and Potassium Uptake and Rhizosphere pH

Document Type : Research Paper

Authors

1 Associate Professor of Plant Physiology, University of Tabriz, Iran

2 Associate Professor of Soil Biology, University of Tabriz, Ira

3 Former M.Sc. Student of Plant Physiology, University of Tabriz, Iran

Abstract

Association between AM fungi and crop species is important because of effect on growth and uptake of mineral nutrients. Limited studies have been undertaken on this association in waterlogged species in general and rice in particular. In this work, the effect of inoculation with two species of AM fungi, namely, Glomus mosseae and Glomus intraradices on growth and phosphorus and potassium uptake was investigated in two cultivars of rice (Oryza sativa L.) cv. Tarom Hashemi and Fajr. In spite of a slight reduction in above-groung growth in colonized plants, root growth and phosphorus uptake were significantly stimulated. Interestingly, the positive response of growth and phosphorus uptake to colonization was observed only in Tarom Hashemi that had higher susceptibility to phosphorus deficiency and lacked induction of root growth under –P conditions. In another experiment using rhizobox technique, it was shown that AM colonization resulted in a significant increase of weight, length and branching of roots. It was also shown that, rhizosphere pH in inoculated and P-deficient plants was lowered up to 1.68 units, could have an important role in dissolving and increasing availability of nutrients such as phosphorus and zinc in soil grown plants. It was demonstrated that, the positive effect of mycorrhizal association on growth and uptake of nutrients depends highly on AM species, plant growth and nutritional status. The positive effect of inoculation is attributable to enhancement of root surface area and reduction of rhizosphere pH.

Keywords

References

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Iranian Journal of Soil Research
Volume 21, Issue 1
May 2007
Pages 111-120

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