Gevuina avellana and Lomatia dentata, two Proteaceae species from evergreen temperate forests of South America exhibit contrasting physiological responses under nutrient deprivation

Zúñiga‐Feest, Alejandra; Sepúlveda, Francisco; Delgado, Mabel; Valle, Susana Raquel Morcelle del; Muñoz, Gastón; Pereira, Maria Julia Salim; Reyes‐Díaz, Marjorie

doi:10.1007/s11104-020-04640-y

Cited by 9 publications

(16 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Larger amounts of carboxylate can be released by cluster roots compared with non-cluster roots. Furthermore, a limited number of cluster roots in Lomatia dentata were found to have a high exudation rate ( Zúñiga-Feest et al, 2020 ). Carboxylate-exudation rates of excised cluster roots are much faster than those from whole root systems ( Delgado et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

Leaf Phosphorus Concentration Regulates the Development of Cluster Roots and Exudation of Carboxylates in Macadamia integrifolia

et al. 2021

View full text Add to dashboard Cite

Phosphorus (P) deficiency induces cluster-root formation and carboxylate exudation in most Proteaceae. However, how external P supply regulates these root traits in Macadamia integrifolia remains unclear. Macadamia plants were grown hydroponically with seven P levels to characterize biomass allocation, cluster-root development, and exudation of carboxylates and acid phosphatases. Plant biomass increased with increasing P supply, peaking at 5 μM P, was the same at 5–25 μM P, and declined at 50–100 μM P. Leaf P concentration increased with increasing P supply, but shoot biomass was positively correlated with leaf P concentration up to 0.7–0.8 mg P g–1 dry weight (DW), and declined with further increasing leaf P concentration. The number of cluster roots declined with increasing P supply, with a critical value of leaf P concentration at 0.7–0.8 mg P g–1 DW. We found a similar trend for carboxylate release, with a critical value of leaf P concentration at 0.5 mg g–1 DW, but the activity of acid phosphatases showed a gradually-decreasing trend with increasing P supply. Our results suggest that leaf P concentration regulates the development and functioning of cluster roots, with a critical P concentration of 0.5–0.8 mg g–1, above which macadamia growth is inhibited.

show abstract

Section: Discussionmentioning

confidence: 99%

Leaf Phosphorus Concentration Regulates the Development of Cluster Roots and Exudation of Carboxylates in Macadamia integrifolia

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The endodermis and the exodermis are key impermeable apoplastic barriers that are common in vascular plant roots [ 28 , 29 , 36 , 37 , 63 , 64 , 65 , 66 , 67 , 68 ]. Apoplastic barriers can be histochemically characterized by the presence of Casparian bands, suberin lamellae, and lignin; these barriers protect tissues from oxygen shortages and inhibit water-solute exchanges [ 18 , 23 , 30 , 34 , 35 , 69 , 70 , 71 , 72 , 73 , 74 ]. All the species examined in this study had roots with an endodermis, but only the roots of Paspalum distichum and Chlorophytum comosum had an exodermis [ 27 , 75 ].…”

Section: Resultsmentioning

confidence: 99%

“…These data will support the development of plants that can be used for the phytoremediation of ion-contaminated soils and oligotrophic water. Our results will also provide suggestions for the breeding of crops that can outcompete weed species [ 3 , 8 , 11 , 12 , 14 , 19 , 23 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 97%

“…Some invasive aquatic plants, including Alternanthera philoxeroides (Amaranthaceae), Eichhornia crassipes (Pontederiaceae), and Pistia stratiotes (Araceae), also hyperaccumulate ions: these species purify eutrophic water bodies and tend to outcompete indigenous plants in similar hostile environments [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Similarly, plants in the Proteaceae have evolved cluster roots with lignified or phenol-rich cortical walls to adapt to environments deficient in phosphorus and other nutrients [ 21 , 22 , 23 ]. Plants with cluster roots potentially facilitate alterations in plant community structure [ 24 ] and outcompete species without cluster roots [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…We also tested the apoplastic permeability of Pteris vittata and Paspalum distichum. An improved understanding of these plant roots’ apoplastic histochemical features might help explain how these plants become invasive, tolerate oligotrophic conditions, and hyperaccumulate ions [ 4 , 5 , 8 , 10 , 11 , 12 , 19 , 20 , 22 , 23 , 25 , 26 ]. These data will support the development of plants that can be used for the phytoremediation of ion-contaminated soils and oligotrophic water.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Apoplastic histochemical features of plant root walls that may facilitate ion uptake and retention

et al. 2021

Open Life Sciences

View full text Add to dashboard Cite

We used brightfield and epifluorescence microscopy, as well as permeability tests, to investigate the apoplastic histochemical features of plant roots associated with ion hyperaccumulation, invasion, and tolerance of oligotrophic conditions. In hyperaccumulator species with a hypodermis (exodermis absent), ions penetrated the root apex, including the root cap. By contrast, in non-hyperaccumulator species possessing an exodermis, ions did not penetrate the root cap. In vivo, the lignified hypodermis blocked the entry of ions into the cortex, while root exodermis absorbed ions and restricted them to the cortex. The roots of the hyperaccumulators Pteris vittata and Cardamine hupingshanensis, as well as the aquatic invasives Alternanthera philoxeroides, Eichhornia crassipes, and Pistia stratiotes, contained lignin and pectins. These compounds may trap and store ions before hypodermis maturation, facilitating ion hyperaccumulation and retention in the apoplastic spaces of the roots. These apoplastic histochemical features were consistent with certain species-specific characters, including ion hyperaccumulation, invasive behaviors in aquatic environments, or tolerance of oligotrophic conditions. We suggest that apoplastic histochemical features of the root may act as invasion mechanisms, allowing these invasive aquatic plants to outcompete indigenous plants for ions.

show abstract

Ecophysiological responses of southern South American Proteaceae to nutrient deprivation are related to their edaphic distributions

2021

Plant Soil

View full text Add to dashboard Cite

Gevuina avellana and Lomatia dentata, two Proteaceae species from evergreen temperate forests of South America exhibit contrasting physiological responses under nutrient deprivation

Cited by 9 publications

References 66 publications

Leaf Phosphorus Concentration Regulates the Development of Cluster Roots and Exudation of Carboxylates in Macadamia integrifolia

Leaf Phosphorus Concentration Regulates the Development of Cluster Roots and Exudation of Carboxylates in Macadamia integrifolia

Apoplastic histochemical features of plant root walls that may facilitate ion uptake and retention

Ecophysiological responses of southern South American Proteaceae to nutrient deprivation are related to their edaphic distributions

Contact Info

Product

Resources

About