Rhizosphere carboxylate concentrations of chickpea are affected by genotype and soil type

Wouterlood, Madeleine; Cawthray, Gregory R.; Turner, Steven; Lambers, Hans; Veneklaas, Erik J.

doi:10.1023/b:plso.0000035568.28893.f6

Cited by 46 publications

(27 citation statements)

References 29 publications

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“…Furthermore, preferential microbial degradation of carboxylates may reduce quantities of some rhizosphere carboxylates more so than others; hence, interpretations of the effect of carboxylates on soil P dynamics in this study are by no means conclusive. Despite this, our results agree well with previous studies that chickpea exudes predominantly malonate (Pearse et al 2006;Ryan et al 2001), even in the absence of P-deficiency stress (Wouterlood et al 2004) and canola predominantly malate (Hoffland et al 1989). Depletion of the water Pi pool by faba bean, chickpea, white lupin and wheat has been reported previously on low-P Australian soils (Nuruzzaman et al 2006;Vu et al 2008), and our study confirmed this.…”

Section: Plant Growthsupporting

confidence: 93%

Wheat, canola and grain legume access to soil phosphorus fractions differs in soils with contrasting phosphorus dynamics

2009

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Despite the high phosphorus (P) mobilizing capacity of many legumes, recent studies have found that, at least in calcareous soils, wheat is also able to access insoluble P fractions through yet unknown mechanism(s). We hypothesized that insoluble P fractions may be more available to non-legume plants in alkaline soils due to increased dissolution of the dominant calcium(Ca)-P pool into depleted labile P pools, whereas non-legumes may have limited access to insoluble P fractions in iron(Fe)-and aluminium (Al)-P dominated acid soils. Four crop species (faba bean, chickpea, wheat and canola) were grown on two acid and one alkaline soil under glasshouse conditions to examine rhizosphere processes and soil P fractions accessed. While all species generally depleted the H 2 O-soluble inorganic P (water Pi) pool in all soils, there was no net depletion of the labile NaHCO 3 -extractable inorganic P fraction (NaHCO 3 Pi) by any species in any soil. The NaOH-extractable P fraction (NaOH Pi) in the alkaline soil was the only non-labile Pi fraction depleted by all crops (particularly canola), possibly due to increases in rhizosphere pH. Chickpea mobilized the insoluble HCl Pi and residual P fractions; however, rhizosphere pH and carboxylate exudation could not fully explain all of the observed Pi depletion in each soil. All organic P fractions appeared highly recalcitrant, with the exception of some depletion of the NaHCO 3 Po fraction by faba bean in the acid soils. Chickpea and faba bean did not show a higher capacity than wheat or canola to mobilize insoluble P pools across all soil types, and the availability of various P fractions to legume and non-legume crops differed in soils with contrasting P dynamics.

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Section: Plant Growthsupporting

confidence: 93%

Wheat, canola and grain legume access to soil phosphorus fractions differs in soils with contrasting phosphorus dynamics

2009

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“…the Proteaceae and Casuarinaceae families) which have evolved on low P soils (Roelofs et al 2001;Shane and Lambers 2005). Increased organic anion efflux from roots in response to P-deficiency also occurs in other species including chickpea (Cicer arietinum L.) and pigeon pea (Cajanus cajan L.) and to a lesser extent in lucerne (alfalfa; Medicago sativa L.), canola (oil seed rape; Brassica napus L.) and rice (Oryza sativa L.) (Ae et al 1991;Hedley et al 1982;Hoffland et al 1989;Lipton et al 1987;Otani et al 1996;Pearse et al 2006a;Veneklaas et al 2003;Wouterlood et al 2004). The increase in organic anion efflux by these species in response to P deficiency however, is considerably less than for the Proteaceae or Lupinus spp, and in many cases the agronomic significance of organic anion release remains to be verified in soil environments, as does the role of various organic anions in mobilizing P from different forms of soil P (Pearse et al 2006b).…”

Section: Role Of Root Exudates In Phosphorus Mobilizationmentioning

confidence: 99%

Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms

et al. 2009

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International audienceThe rhizosphere is a complex environment where roots interact with physical, chemical and biological properties of soil. Structural and functional characteristics of roots contribute to rhizosphere processes and both have significant influence on the capacity of roots to acquire nutrients. Roots also interact extensively with soil microorganisms which further impact on plant nutrition either directly, by influencing nutrient availability and uptake, or indirectly through plant (root) growth promotion. In this paper, features of the rhizosphere that are important for nutrient acquisition from soil are reviewed, with specific emphasis on the characteristics of roots that influence the availability and uptake of phosphorus and nitrogen. The interaction of roots with soil microorganisms, in particular with mycorrhizal fungi and non-symbiotic plant growth promoting rhizobacteria, is also considered in relation to nutrient availability and through the mechanisms that are associated with plant growth promotion

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“…Research in this area therefore has potential to increase the productivity or P-fertiliser-use efficiency of agricultural systems. The study of carboxylate release by grain crops has focused primarily on L. albus L. (Dinkelaker et al 1989;Neumann and Rö mheld 1999;Li and Liang 2005), although limited work has now also been done on other grain crops such as Brassica napus L. (Hoffland et al 1989;Zhang et al 1997), and Cicer arietinum L. (Neumann et al 1999;Veneklaas et al 2003;Wouterlood et al 2004a), T. aestivum L., Vicia faba L. and Pisum sativum L. (Nuruzzaman et al 2005a, b), and some other Lupinus species (Barbas et al 1999;Hocking and Jeffery 2004;Ligaba et al 2004). With a few exceptions Hocking et al 2004;Nuruzzaman et al 2005a, b), most studies focus on only one species.…”

Section: Introductionmentioning

confidence: 99%

Carboxylate release of wheat, canola and 11 grain legume species as affected by phosphorus status

et al. 2006

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The capacity of plant roots to increase their carboxylate exudation at a low plant phosphorus (P) status is an adaptation to acquire sufficient P at low soil P availability. Our objective was to compare crop species in their adaptive response to a low-P availability, in order to gain knowledge to be used for improving crop Pacquisition efficiency from soils that are low in P or that have a high capacity to retain P. In the present screening study we compared 13 crop species, grown in sand at either 3 or 300 lM of P, and measured root mass ratio, cluster-root development, rhizosphere pH and carboxylate composition of root exudates. Root mass ratio decreased with increasing P supply for Triticum aestivum L., Brassica napus L., Cicer arietinum L. and Lens culinaris Medik., and increased only for Pisum sativum L., while the Lupinus species and Vicia faba L. were not responsive. Lupinus species that had the potential to produce root clusters either increased or decreased biomass allocation to clusters at 300 lM of P compared with allocation at 3 lM of P. All Lupinus species acidified their rhizosphere more than other species did, with average pH decreasing from 6.7 (control) to 4.3 for Lupinus pilosus L. and 5.9 for Lupinus atlanticus L.; B. napus maintained the most alkaline rhizosphere, averaging 7.4 at 300 lM of P. Rhizosphere carboxylate concentrations were lowest for T. aestivum, B. napus, V. faba, and L. culinaris than for the other species. Exuded carboxylates were mainly citrate and malate for all species, with the exception of L. culinaris and C. arietinum, which produced mainly citrate and malonate. Considerable variation in the concentration of exuded carboxylates and protons was found, even with a genus. Cluster-root forming species did not invariably have the highest concentrations of rhizosphere carboxylates. Lupinus species varied both in P-uptake and in the sensitivity of their cluster-root development to external P supply. Given the carbon cost of cluster roots, a greater plasticity in their formation and exudation (i.e. reduced investment in cluster roots and exudation at higher soil P, a negative feedback response) is a desirable trait for agricultural species that may have variable access to readily available P.

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Rhizosphere carboxylate concentrations of chickpea are affected by genotype and soil type

Cited by 46 publications

References 29 publications

Wheat, canola and grain legume access to soil phosphorus fractions differs in soils with contrasting phosphorus dynamics

Wheat, canola and grain legume access to soil phosphorus fractions differs in soils with contrasting phosphorus dynamics

Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms

Carboxylate release of wheat, canola and 11 grain legume species as affected by phosphorus status

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