Putting the P in Ptilotus: a phosphorus-accumulating herb native to Australia

Ryan, Megan H.; Ehrenberg, Susanne; Bennett, Richard G.; Tibbett, Mark

doi:10.1093/aob/mcp021

Cited by 47 publications

(65 citation statements)

References 35 publications

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“…Such high root P concentrations have seldom been reported. Many Australian native plants have evolved in severely P-impoverished environments (Handreck 1997) and efficient Pacquisition mechanisms appear to be poorly regulated at high P availability in some of these species (Lambers et al 2008b;Ryan et al 2009;Shane et al 2004). The ability to accumulate high concentrations of P in roots of perennial legumes in the present study and in shoots (Pang et al 2009) might be related to a low capacity to down-regulate P uptake as found in Hakea prostrata (Shane et al 2004).…”

Section: P Concentrations In Rootsmentioning

confidence: 56%

Variation in morphological and physiological parameters in herbaceous perennial legumes in response to phosphorus supply

et al. 2009

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Change in morphological and physiological parameters in response to phosphorus (P) supply was studied in 11 perennial herbaceous legume species, six Australian native (Lotus australis, Cullen australasicum, Kennedia prorepens, K. prostrata, Glycine canescens, C. tenax) and five exotic species (Medicago sativa, Lotononis bainesii, Bituminaria bituminosa var albomarginata, Lotus corniculatus, Macroptilium bracteatum). We aimed to identify mechanisms for P acquisition from soil. Plants were grown in sterilised washed river sand; eight levels of P as KH 2 PO 4 ranging from 0 to 384 μg P g −1 soil were applied. Plant growth under low-P conditions strongly correlated with physiological P-use efficiency and/ or P-uptake efficiency. Taking all species together, at 6 μg P g −1 soil there was a good correlation between P uptake and both root surface area and total root length. All species had higher amounts of carboxylates in the rhizosphere under a low level of P application. Six of the 11 species increased the fraction of rhizosphere citrate in response to low P, which was accompanied by a reduction in malonate, except L. corniculatus. In addition, species showed different plasticity in response to P-application levels and different strategies in response to P deficiency. Our results show that many of the 11 species have prospects for low-input agroecosystems based on their high P-uptake and P-use efficiency.

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Section: P Concentrations In Rootsmentioning

confidence: 56%

Variation in morphological and physiological parameters in herbaceous perennial legumes in response to phosphorus supply

et al. 2009

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“…A low capacity to downregulate P uptake at elevated soil P availability would appear to be a highly undesirable trait in crop and pasture plants, but this requires further investigation. For example, the Australian native herb Ptilotus polystachyus (Amaranthaceae), a fast-growing plant with an apparent low capacity to down-regulate its P uptake, accumulates P to very high concentrations, approximately 40 mg g 21 shoot dry weight, without signs of P toxicity (Ryan et al, 2009). …”

Section: Leaf P Concentrationsmentioning

confidence: 99%

“…We discuss the P-use efficiency of photosynthesis and growth, P-remobilization efficiency and proficiency, and P allocation to seeds. More sustainable, P-efficient cropping systems are urgently needed, and knowledge about native plant physiology in ancient landscapes may guide us toward their development, either through directing the breeding or engineering of existing major crop species or through aiding the development as crops of species that originate from these P-impoverished landscapes (Ryan et al, 2009;Pang et al, 2010aPang et al, , 2010bSuriyagoda et al, 2010;Bell et al, 2011).…”

mentioning

confidence: 99%

Phosphorus Nutrition of Proteaceae in Severely Phosphorus-Impoverished Soils: Are There Lessons To Be Learned for Future Crops?

Lambers

Finnegan²,

Laliberté³

et al. 2011

Plant Physiology

188

132

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“…Various root characteristics including root architecture, root diameter, root hairs, cluster roots (Bates and Lynch 2000 ;Hill et al 2006 ;Singh Gahoonia and Nielsen 2004 ), symbiotic relationship with mycorrhiza, kinetics of P uptake, and rhizospheric processes (Aziz et al 2011a ;Hinsinger 2001 ;Pang et al 2010 ;Ryan et al 2009 ) cause variations in P uptake among the plant species/cultivars Singh Gahoonia and Nielsen 2004 ). Response to P defi ciency by plant roots involves changes in root architecture and the shift of biomass allocation from basal to adventitious roots in such a way to explore more topsoil or P-rich (Lambers and Shane 2007 ) sites for P acquisition (Liao et al 2001Lynch and Brown 2001 ).…”

Section: Architectural Adaptationsmentioning

confidence: 99%

Phosphorus Deficiency in Plants: Responses, Adaptive Mechanisms, and Signaling

Aziz

Ṣābir

Farooq

et al. 2013

Plant Signaling: Understanding the Molecular Crosstalk

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Phosphorus (P) defi ciency is a common nutritional factor limiting agricultural production around the globe. Application of phosphatic fertilizers is generally recommended to cope with P defi ciency; however, low use efficiency of available P fertilizers both in calcareous and acid soils limits its viability and also had serious environmental concerns. Higher plants have adapted a number of mechanism to live with low available P in soil such as changes in root morphology and architecture, decreased growth rate, improved P uptake and utilization effi ciency, and exudation of organic acids and enzymes to solubilize external inorganic and organic P compounds in the rhizosphere. Plant species and even cultivars widely differ in P effi ciency because of differences in one or more of these mechanisms. Exploitation of these genetic variations among crop plants can sustain agricultural production. Understanding the mechanism involved in sensing P defi ciency could facilitate selection, breeding, and genetic engineering approaches to improve crop production in P-stressed environments and could reduce dependence on nonrenewable inorganic P resources. In this chapter, we briefl y reviewed the responses of P defi ciency in higher plants, their adaptive mechanisms, and signaling pathways.

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Putting the P in Ptilotus: a phosphorus-accumulating herb native to Australia

Abstract: In comparison to chicory, ptilotus demonstrated an impressive ability to grow well under conditions of low and high P availability. Further study of the mechanisms of P uptake and tolerance in ptilotus is warranted.

Cited by 47 publications

References 35 publications

Variation in morphological and physiological parameters in herbaceous perennial legumes in response to phosphorus supply

Variation in morphological and physiological parameters in herbaceous perennial legumes in response to phosphorus supply

Phosphorus Nutrition of Proteaceae in Severely Phosphorus-Impoverished Soils: Are There Lessons To Be Learned for Future Crops?

Phosphorus Deficiency in Plants: Responses, Adaptive Mechanisms, and Signaling

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