Volume 186, Issue 5 pp. 554-567
RESEARCH ARTICLE

Silencing of FRO1 gene affects iron homeostasis and nutrient balance in tomato plants

Florinda Gama

Florinda Gama

MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Faro, Portugal

GreenCoLab—Associação Oceano Verde, University of Algarve, Faro, Portugal

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Teresa Saavedra

Teresa Saavedra

MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Faro, Portugal

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Susana Dandlen

Susana Dandlen

MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Faro, Portugal

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Pedro García-Caparrós

Pedro García-Caparrós

Agronomy Department of Superior School Engineering, University of Almeria, Almeria, Spain

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Amarilis de Varennes

Amarilis de Varennes

Instituto Superior de Agronomia, University of Lisbon, Lisbon, Portugal

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Gustavo Nolasco

Gustavo Nolasco

Faculty of Science and Technology, University of Algarve, Faro, Portugal

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Pedro José Correia

Pedro José Correia

MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Faro, Portugal

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Maribela Pestana

Corresponding Author

Maribela Pestana

MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Faro, Portugal

Correspondence

Maribela Pestana, MED—Mediterranean Institute for Agriculture, Environment and Development and CHANGE—Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Building 8, Campus of Gambelas, 8005-139 Faro, Portugal.

Email: [email protected]

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First published: 16 July 2023

This article has been edited by Michael Frei.

Abstract

Background

Iron chlorosis is an abiotic stress of worldwide importance affecting several agronomic crops. It is important to understand how plants maintain nutrient homeostasis under Fe deficiency and recovery.

Aims

We used the virus-induced gene silencing (VIGS) method to elucidate the role of the FRO1 gene in tomato plants and identify the impact on regulation of the root ferric-chelate reductase (FCR) activity and nutritional homeostasis.

Methods

Tomato plantlets cv. “Cherry” were transferred into half-strength Hoagland's nutrient solution containing 0.5 µM of Fe (Fe0.5). In phase I, two treatments were established: control (Fe0.5) plants and VIGS-0.5 plants corresponding to plants with the FRO1 gene silenced. In phase II, plants from Fe0.5 and VIGS-0.5 were transferred to new nutrient solution and then grown for a further 14 days under 0 and 10 µM of Fe (as 0.5 µM would not be enough for the larger plants during phase II). Therefore, four treatments were imposed: Fe0, Fe10, VIGS-0, and VIGS-10.

Results

VIGS-0.5 plants had significantly lower chlorophyll (Chl) and root FCR activity compared to the respective non-silenced plants and retained more Cu and Zn in the roots at the expense of stems (Cu) or young leaves (Zn). Iron concentration in roots and stems decreased in FRO1 gene-silenced plants, compared to control plants, but the allocation to different organs was similar in both treatments.

Conclusions

There was a partial recovery of leaf Chl in the VIGS-10 plants and a higher concentration of Fe in all organs. In contrast, the allocation of Cu to roots decreased in the VIGS-10 plants.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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