The effect of phosphorus on cluster-root formation and functioning of Embothrium coccineum (R. et J. Forst.)

Delgado, Mabel; Zúñiga‐Feest, Alejandra; Alvear, Marysol; Borie, Fernando

doi:10.1007/s11104-013-1829-3

Cited by 27 publications

(24 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this sense, Delgado et al (2013) found that E. coccineum presented a greater phosphatase activity compared with that reported in other species bearing-cluster roots. We suggest that, contrary to what happens in extremely nutrient-impoverished environments, on relatively nutrient-rich soils selection is for quick recycling of nutrients from leaf litter and from senesced roots.…”

Section: Total P and Mn Concentrations In Roots Of E Coccineumsupporting

confidence: 44%

“…In addition, we found higher values of FDA hydrolysis and dehydrogenase activity in the rhizosphere of senescent cluster roots, indicating that, due to the short life of these roots, approx. 30 days (Delgado et al 2013;2014), the microbial activity of this root tissue increases significantly by the decomposition. In contrast, in the rhizosphere of mature cluster roots, dehydrogenase activities were significantly lower than those in the other evaluated rhizosphere soils and bulk soil.…”

Section: Discussionmentioning

confidence: 96%

See 1 more Smart Citation

Cluster roots of Embothrium coccineum (Proteaceae) affect enzyme activities and phosphorus lability in rhizosphere soil

et al. 2015

Self Cite

View full text Add to dashboard Cite

Background and aim Cluster roots have a profound effect on their rhizosphere. Our aim was to determine the effect of cluster roots of Embothrium coccineum, growing under natural conditions, on soil enzyme activities and phosphorus (P) lability in its rhizosphere. Methods We determined enzyme activities: acid phosphatase (P-ase), dehydrogenase and β-glucosidase, and the rate of hydrolysis of fluorescein diacetate (FDA), as well as P fractions in the cluster root rhizosphere at different cluster-root developmental stages (juvenile, mature, semi-senescent, senescent), in the non-cluster root rhizosphere, and in bulk soil. In addition, the concentrations of total P and manganese Mn in roots was measured. ResultsThe rhizosphere of senescing cluster roots presented the highest P-ase, β-glucosidase and dehydrogenase activities, and fastest rate of FDA hydrolysis, being 2.6-, 4.6-, 3.3-and 25.8-fold greater, respectively, than those in the rhizosphere of mature cluster roots. The P fractionation showed that the inorganic P (Pi) fraction was 15 % greater in the rhizosphere of mature cluster roots than in that of other stages. Mature cluster roots showed the highest total [P], suggesting the fastest P uptake. Conclusion Cluster roots of E. coccineum modified their rhizosphere depending on their developmental stage, presenting lower soil enzyme activities at the mature stage than at other development stages. In addition, mature cluster roots increased the Pi fraction in their rhizosphere, allowing the highest total root [P] at this developmental stage.

show abstract

Section: Total P and Mn Concentrations In Roots Of E Coccineumsupporting

confidence: 44%

Section: Discussionmentioning

confidence: 96%

Cluster roots of Embothrium coccineum (Proteaceae) affect enzyme activities and phosphorus lability in rhizosphere soil

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Detailed developmental studies have shown that root clusters can be physiologically active for as little as 10 days or up to 4 weeks . For example, after initiation, dauciform roots in Schoenus unispiculatus reach maturity within ∼ 7 days (Figure (e)), whereas proteoid‐roots of Hakea prostrata (Proteaceae) require approximately 14 days (Figure (f)).…”

Section: Role Of Nutrients In Root Cluster Formation: Similarity In Fmentioning

confidence: 99%

Nutritional regulation of root development

Herrera

Shane

López‐Bucio

2015

WIREs Developmental Biology

View full text Add to dashboard Cite

Mineral nutrients such as nitrogen (N), phosphorus (P), and iron (Fe) are essential for plant growth, development, and reproduction. Adequate provision of nutrients via the root system impacts greatly on shoot biomass and plant productivity and is therefore of crucial importance for agriculture. Nutrients are taken up at the root surface in ionic form, which is mediated by specific transport proteins. Noteworthy, root tips are able to sense the local and internal concentrations of nutrients to adjust growth and developmental processes, and ultimately, to increase or decrease the exploratory capacity of the root system. Recently, important progress has been achieved in identifying the mechanisms of nutrient sensing in wild- and cultivated species, including Arabidopsis, bean, maize, rice, lupin as well as in members of the Proteaceae and Cyperaceae families, which develop highly sophisticated root clusters as adaptations to survive in soils with very low fertility. Major findings include identification of transporter proteins and transcription factors regulating nutrient sensing, miRNAs as mobile signals and peptides as repressors of lateral root development under heterogeneous nutrient supply. Understanding the roles played by N, P, and Fe in gene expression and biochemical characterization of proteins involved in root developmental responses to homogeneous or heterogeneous N and P sources has gained additional interest due to its potential for improving fertilizer acquisition efficiency in crops.

show abstract

“…No symptoms of P toxicity have ever been recorded for seedlings of E. coccineum grown in sand and fertilised with nutrient solution containing 1000 μ m P (Zúñiga‐Feest, Delgado & Alberdi ), nor in seedlings growing in nutrient solution with 50 μ m P (Delgado et al . ). These results suggest that E. coccineum is less sensitive to P toxicity than some other Proteaceae species occurring in old and infertile soils in Australia and South Africa (Lambers et al .…”

Section: Introductionmentioning

confidence: 97%

Divergent functioning of Proteaceae species: the South AmericanEmbothrium coccineumdisplays a combination of adaptive traits to survive in high‐phosphorus soils

et al. 2014

View full text Add to dashboard Cite

Summary1. Proteaceae species in south-western Australia thrive on phosphorus-impoverished soils, employing a phosphorus-mining strategy involving carboxylate-releasing cluster roots. Some develop symptoms of phosphorus toxicity at slightly elevated soil phosphorus concentrations, due to their low capacity to down-regulate phosphorus uptake. In contrast, Proteaceae species in Chile, e.g. Embothrium coccineum J.R. Forst. & G. Forst., occur on volcanic soils, which contain high levels of total phosphorus, but phosphorus availability is low. 2. We hypothesised that the functioning of cluster roots of E. coccineum differs from that of south-western Australian Proteaceae species, in accordance with the difference in soil phosphorus status. With more phosphorus to be gained from the soil with high levels of total phosphorus, we expect less investment in biomass and more release of carboxylates. Furthermore, we hypothesised that E. coccineum regulates its phosphorus-uptake capacity, avoiding phosphorus toxicity when grown at elevated phosphorus levels. To test these hypotheses, E. coccineum seedlings were grown at a range of phosphorus supplies in nutrient solution. 3. We show that E. coccineum allocated at least five times less biomass to cluster roots that released at least nine times more carboxylates per unit cluster root weight compared with south-western Australian species (e.g. Banksia, Hakea). The highest phosphorus supply caused a growth inhibition and high leaf phosphorus concentration, without symptoms of phosphorus toxicity. We accept our hypotheses on the functioning of cluster roots and the high capacity to reduce the net phosphorus uptake in plants grown at a high-phosphorus supply. 4. This novel combination of traits indicates divergent functioning of Proteaceae species from southern South America, exposed to frequent phosphorus input due to volcanic activity, in contrast with the functioning of south-western Australian Proteaceae species that thrive on severely phosphorus-impoverished soils. These traits could explain the functioning of E. coccineum on soils that are rich in total phosphorus, but with a low concentration of available phosphorus.

show abstract

The effect of phosphorus on cluster-root formation and functioning of Embothrium coccineum (R. et J. Forst.)

Cited by 27 publications

References 45 publications

Cluster roots of Embothrium coccineum (Proteaceae) affect enzyme activities and phosphorus lability in rhizosphere soil

Cluster roots of Embothrium coccineum (Proteaceae) affect enzyme activities and phosphorus lability in rhizosphere soil

Nutritional regulation of root development

Divergent functioning of Proteaceae species: the South AmericanEmbothrium coccineumdisplays a combination of adaptive traits to survive in high‐phosphorus soils

Contact Info

Product

Resources

About