Nutrient interactions and arbuscular mycorrhizas: a meta-analysis of a mycorrhiza-defective mutant and wild-type tomato genotype pair
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Background and aims
Arbuscular mycorrhizas (AM) enhance plant uptake of a range of mineral nutrients from the soil. Interactions between nutrients in the soil and plant, are complex, and can be affected by AM. Using a mycorrhiza-defective mutant tomato genotype (rmc) and its wild-type (76R), provides a novel method to study AM functioning.
We present a meta-analysis comparing tissue nutrient concentration (P, Zn, K, Ca, Cu, Mg, Mn, S, B, Na, Fe), biomass and mycorrhizal colonisation data between the 76R and rmc genotypes, across a number of studies that have used this pair of tomato genotypes. Particular attention is paid to interactions between soil P or soil Zn, with tissue nutrients.
For most nutrients, the difference in concentration between genotypes was significantly affected either by soil P, soil Zn, or both. When soil P was deficient, AM were particularly beneficial in terms of uptake of not only P, but other nutrients as well.
Colonisation by AMF significantly affects the uptake of many soil macro- and micro-nutrients. Furthermore, the soil P and Zn status also influences the difference in nutrient concentrations between mycorrhizal and non-mycorrhizal plants. The interactions identified by this meta-analysis provide a basis for future research in this area.
KeywordsArbuscular mycorrhizas (AM) Micro-nutrients Macro-nutrients Nutrient interactions Phosphorus (P) Zinc (Zn) 76R, rmc Solanum lycopersicum (tomato)
The authors wish to thank members of Cavlab, particularly Dr. Michael Rose for advice on the meta-analysis. We also gratefully acknowledge Prof. Sally Smith and A/Prof. Susan Barker for continued access to the rmc and 76R genotypes of tomato. We also thank Prof. Sally Smith for valuable discussions, and two anonymous reviewers for their helpful comments on an earlier version of this manuscript. TRC also wishes to acknowledge the Australian Research Council for financial support (FT120100463).
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