Examinando por Autor "Delgado, M."

Mostrando 1 - 1 de 1
  • Miniatura
    Ítem
    Contrasting responses of cluster roots formation induced by phosphorus and nitrogen supply in Embothrium coccineum populations from different geographical origin
    (Springer Science and Business Media Deutschland GmbH, 2020-08) Bertin-Benavides, A.; Bascuñán-Godoy, L.; Henríquez-Castillo C.; Delgado, M.; Burgos, C.F.; Mardones, C.; Ávila-Valdés, A.; Valdebenito, F.; Bravo, S.; Rubilar, R.; Hasbún, R.; Zúñiga-Feest, A.
    Aims: Embothrium coccineum is a pioneer tree that produces cluster roots (CR) induced by phosphorus (P) or nitrogen (N) deficiency, but the role which both N and P play in CR formation for different E. coccineum populations is still unknown. We hypothesized that in E. coccineum, N influences the CR formation response, primarily induced by P limitation. However, this response depends on local adaptations to their specific conditions of geographic origin. Methods: Seedlings from three contrasting edaphoclimatic conditions (Northern, Central and Southern populations) were grown in hydroponic culture under high and low N supply and at five different P supply. Morphophysiological responses, including CR number, growth, biomass, P and N plant concentration, were studied. Results: Our results showed that at high N supply, CR formation was stimulated with increased P supply, but just until it reaches a maximum of 5 μM, above this concentration CR formation decreases. However, at low N supply, a constitutive response was observed regardless of P supply. Moreover, each of these responses depends on the populations. Conclusions: Our study suggests that N drives CR formation induced by P supply and that a differential response exists among E. coccineum populations, that could be related to their origin edaphoclimatic conditions. © 2020, Springer Nature Switzerland AG.