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Institucional

Zuniga-Feest, Alejandra

Munoz, Gaston#Bustos-Salazar, Angela#Ramirez, Felipe#Delgado, Mabel#Valle, Susana#Diaz, Leyla

The nitrogen fixing specie Sophora cassioides (Fabaceae ), is nutritionally favored and their rhizosphere bacteria modified when is co-cultivated with the cluster root forming Embothrium coccineum (Proteaceae)

SPRINGER INTERNATIONAL PUBLISHING AG

JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

en

The hypothesis that Embothrium coccineum, a species able to solubilize P through cluster roots (CR) carboxylate exudation, makes P more available in volcanic depositions, thus facilitating the growth of other plant species such as the N-fixing Sophora cassioides was tested. In this work, seedlings of these two tree species were grown alone or co-cultivated for six months in greenhouse conditions with either pumice, a recent volcanic deposition with low P availability, or an organic commercial mix. Upon analyzing the aboveground growth of the two substrate treatments, we found no clear evidence of facilitation. Despite this, substrate type did influence the relative growth and some characteristics of CR and nodules. On the other side, the number of total soil bacteria, but not Rhizobium spp, was greater when E. coccineum and S. cassioidea were grown together than when only one species was grown alone. Nutritional parameters, such as the concentration of nitrogen (N) and phosphorous (P) in roots and total leaf protein content in leaves, indicated that the nutritional content of S. cassioides was greater when co-cultivated with E. coccineum in pumice. Specifically, co-cultivation tended to reduced P limitation and improved N acquisition by S. cassioides. Based on these results, our hypothesis is partially accepted.

Artículo original

The authors acknowledge the assistance of Eric Herdocio for the bacteria and Rhizobium determinations. This work was supported by the Chilean National Commission for Scientific and Technological Research (FONDECYT) grants 1130440 and initiation project No 11170368 (MD).

Los autores agradecen la colaboración de Eric Herdocio en la determinación de bacterias y Rhizobium. Este trabajo contó con el apoyo de las subvenciones 1130440 y el proyecto de iniciación n.º 11170368 (MD) del Fondo Nacional de Investigación Científica y Tecnológica (FONDECYT).

10.4067/S0718-95162018005001801

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Facilitation# cluster roots# nodules# volcanic deposition plant colonization

http://dx.doi.org/10.4067/S0718-95162018005001801

Plant Sciences# Environmental Sciences# Soil Science

Facilitación# raíces de racimo# nódulos# Colonización de plantas de deposición volcánica.

Agronomía

Ciencias del suelo

Ecología

WOS:000450917100001

The nitrogen fixing specie <i>Sophora cassioides</i> (Fabaceae ), is nutritionally favored and their rhizosphere bacteria modified when is co-cultivated with the cluster root forming <i>Embothrium coccineum</i> (Proteaceae)

Artículo original

version publicada

SPRINGER INTERNATIONAL PUBLISHING AG

JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

Ciencias Vegetales# Ciencias Ambientales# Ciencia del suelo

0718-9516

en

ANID FONDECYT 11304403#ANID INICIACION 11170368

ANID FONDECYT 1130440

ANID FONDECYT 11170368

The authors acknowledge the assistance of Eric Herdocio for the bacteria and Rhizobium determinations. This work was supported by the Chilean National Commission for Scientific and Technological Research (FONDECYT) grants 1130440 and initiation project No 11170368 (MD).

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