Salinity impairs photosynthetic capacity and enhances carotenoid-related gene expression and biosynthesis in tomato (Solanum lycopersicum L. cv. Micro-Tom)

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Leiva-Ampuero et al. @iBioChile examine the effects of salt stress in tomato. @thePeerJ article - Salinity impairs photosynthetic capacity and enhances carotenoid-related #gene expression and #biosynthesis in #tomato. Article: https://t.co/JIRJlPBjOi https://t.co/BXFk2Nt3lZ
Plant Biology

Main article text

 

Introduction

Materials & Methods

Plant material, growth conditions and salt treatments

Plant sampling and phenotypic analysis

Photosynthetic parameters

Carotenoid levels analysis

Gene expression analysis

Statistical analysis

Results

Photosynthetic capacity is hampered by salt stress in tomato plants

Salinity-induced differential expression of carotenoid-related genes and accumulation of metabolites in tomato fruits

Discussion

Conclusions

Supplemental Information

Maximum quantum yield of PSII (Fv/Fm) in salt-stressed plants

Samples were collected at (A) 2 and (B) 8 weeks of 0, 40, 80, 120, or 160 mM NaCl irrigation. Data points represent mean ± SEM of five and between three and five biological replicates for 2 and 8 weeks of salinity treatment (wst), respectively. Different letters indicate statistically significant differences among treatments, as determined by Tukey’s multiple comparison test (P ≤ 0.05)

DOI: 10.7717/peerj.9742/supp-1

Analysis of tomato clusters in salt-stressed plants

Plants were evaluated at 9 (A) and 14 (B) weeks, employing the indicated NaCl concentrations. Data points represent mean ± SEM (n = 3). Different letters indicate statistically significant differences among treatments as determined by Tukey’s multiple comparison test (P ≤ 0.05).

DOI: 10.7717/peerj.9742/supp-2

Influence of salinity in tomato fruit production

(A) The number of initial flowers and (B) the number of remaining fruits in plants exposed for 14 weeks employing the indicated NaCl concentrations. Data points represent mean ± SEM (n = 3). Different letters indicate statistically significant differences among treatments, as determined by Tukey’s multiple comparison test (P ≤ 0.05).

DOI: 10.7717/peerj.9742/supp-3

Tomato fruit quality parameters in salt-stressed plants

(A) Fruit fresh weight; (B) Fruit caliber; (C) Soluble solids. Fruit samples were collected at 40 and 60 days post-anthesis (dpa) from plants exposed to salinity treatment for 11 and 14 weeks, respectively, employing the indicated NaCl concentrations. Data points represent mean ± SEM (n = 3). Different letters indicate statistically significant differences among treatments as determined by Tukey’s multiple comparison test (P ≤ 0.05).

DOI: 10.7717/peerj.9742/supp-4

Total carotenoid content of tomato fruits from salt-stressed plants

Fruit samples were collected at 40 (A) and 60 (B) days post-anthesis (dpa) from plants exposed for 11 and 14 weeks, respectively, employing the indicates NaCl concentrations. Data points represent mean ± SEM (n = 3). Different letters indicate statistically significant differences among treatments as determined by Tukey’s multiple comparison test (P ≤ 0.05). DW, dry weight.

DOI: 10.7717/peerj.9742/supp-5

RT-qPCR analysis of carotenoid biosynthesis pathway genes in response to salt stress

(A, B) LYCE; (C, D) CRTISO; (E, F) PSY2. Fruit samples were collected at 40 (A, C, E) and 60 (B, D, F) days post-anthesis (dpa) from plants exposed for 11 and 14 weeks, respectively, employing the indicates NaCl concentrations. Data points represent mean ± SEM (n=6). Different letters indicate statistically significant differences among treatments, as determined by Tukey’s multiple comparison test (P ≤ 0.05).

DOI: 10.7717/peerj.9742/supp-6

RT-qPCR analysis of ripening-related ethylene genes in response to salt stress

DOI: 10.7717/peerj.9742/supp-7

Representative plants in salinity treatments

A representative plant at 14 weeks after salinity treatments. The concentration of NaCl is indicated in each pot. The white line represent 10 cm.

DOI: 10.7717/peerj.9742/supp-8

Primer sequences used in RT-qPCR analysis

DOI: 10.7717/peerj.9742/supp-9

Raw data for all figures and supplemental figures

DOI: 10.7717/peerj.9742/supp-10

Additional Information and Declarations

Competing Interests

The authors declare there are no competing interests.

Author Contributions

Andrés Leiva-Ampuero conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, and approved the final draft.

Mario Agurto analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, and approved the final draft.

José Tomás Matus and Paulo Canessa analyzed the data, authored or reviewed drafts of the paper, and approved the final draft.

Gustavo Hoppe, Claudio Inostroza-Blancheteau and Marjorie Reyes-Díaz performed the experiments, prepared figures and/or tables, and approved the final draft.

Camila Huidobro analyzed the data, prepared figures and/or tables, and approved the final draft.

Claudia Stange performed the experiments, authored or reviewed drafts of the paper, and approved the final draft.

Andrea Vega conceived and designed the experiments, analyzed the data, authored or reviewed drafts of the paper, and approved the final draft.

Data Availability

The following information was supplied regarding data availability:

The raw data is available in the Supplemental File.

Funding

This research was funded by Instituto Milenio iBio—Iniciativa Científica Milenio MINECON, ANID/FONDECYT 1171631 (Andrea Vega), 1180747 (Claudia Stange) and by the Ramón y Cajal program grant (RYC-2017-23645) awarded to José Tomás Matus from the Ministerio de Ciencia, Innovación y Universidades (MCIU, Spain), Agencia Estatal de Investigación (AEI, Spain), and Fondo Europeo de Desarrollo Regional (FEDER, European Union). Andrés Leiva-Ampuero and Camila Huidobro were supported by the Agencia Nacional de Investigación y Desarrollo (ANID PhD fellowship no. 21100365 and 21191219, respectively) and Mario Agurto was supported by ANID/FONDECYT postdoctoral grant number 3190888. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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