Carbohydrate and lipid balances in the positive plant phenotypic response to arbuscular mycorrhiza: increase in sink strength

Author:

Salmeron‐Santiago Isaac A.1ORCID,Martínez‐Trujillo Miguel1ORCID,Valdez‐Alarcón Juan J.2ORCID,Pedraza‐Santos Martha E.3ORCID,Santoyo Gustavo4ORCID,López Pedro A.5ORCID,Larsen John6ORCID,Pozo María J.7ORCID,Chávez‐Bárcenas Ana T.3ORCID

Affiliation:

1. Facultad de Biología Universidad Michoacana de San Nicolás de Hidalgo Morelia Mexico

2. Centro Multidisciplinario de Estudios en Biotecnología Universidad Michoacana de San Nicolás de Hidalgo Morelia Mexico

3. Facultad de Agrobiología “Presidente Juárez” Universidad Michoacana de San Nicolás de Hidalgo Uruapan Mexico

4. Instituto de Investigaciones Químico Biológicas Universidad Michoacana de San Nicolás de Hidalgo Morelia Mexico

5. Colegio de Postgraduados‐Campus Puebla San Pedro Cholula Mexico

6. Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Mexico

7. Departamento de Microbiología del Suelo y Sistemas Simbióticos Estación Experimental del Zaidín Granada Spain

Abstract

AbstractThe exchange of phosphorus (P) and carbon (C) between plants and arbuscular mycorrhizal fungi (AMF) is a major determinant of their mutualistic symbiosis. We explored the C dynamics in tomato (Solanum lycorpersicum) inoculated or not with Rhizophagus irregularis to study their growth response under different NaH2PO4 concentrations (Null P, 0 mM; Low P, 0.065 mM; High P, 1.3 mM). The percentage of AMF colonization was similar in plants under Null and Low P, but severely reduced under High P. However, the AMF mass biomarker 16:1ω5 revealed higher fungal accumulation in inoculated roots under Low P, while more AMF spores were produced in the Null P. Under High P, AMF biomass and spores were strongly reduced. Plant growth response to mycorrhiza was negative under Null P, showing reduction in height, biovolume index, and source leaf (SL) area. Under Low P, inoculated plants showed a positive response (e.g., increased SL area), while inoculated plants under High P were similar to non‐inoculated plants. AMF promoted the accumulation of soluble sugars in the SL under all fertilization levels, whereas the soluble sugar level decreased in roots under Low P in inoculated plants. Transcriptional upregulation of SlLIN6 and SlSUS1, genes related to carbohydrate metabolism, was observed in inoculated roots under Null P and Low P, respectively. We conclude that P‐limiting conditions that increase AMF colonization stimulate plant growth due to an increase in the source and sink strength. Our results suggest that C partitioning and allocation to different catabolic pathways in the host are influenced by AMF performance.

Funder

CONACYT

CIC

Publisher

Wiley

Subject

Cell Biology,Plant Science,Genetics,General Medicine,Physiology

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