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Nutritional value of potato (Solanum tuberosum) in hot climates: anthocyanins, carotenoids, and steroidal glycoalkaloids

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Abstract

Main conclusion

Growth in hot climates selectively alters potato tuber secondary metabolism—such as the anthocyanins, carotenoids, and glycoalkaloids—changing its nutritive value and the composition of health-promoting components.

Abstract

Potato breeding for improved nutritional value focuses mainly on increasing the health-promoting carotenoids and anthocyanins, and controlling toxic steroidal glycoalkaloids (SGAs). Metabolite levels are genetically determined, but developmental, tissue-specific, and environmental cues affect their final content. Transcriptomic and metabolomic approaches were applied to monitor carotenoid, anthocyanin, and SGA metabolite levels and their biosynthetic genes’ expression under heat stress. The studied cultivars differed in tuber flesh carotenoid concentration and peel anthocyanin concentration. Gene expression studies showed heat-induced downregulation of specific genes for SGA, anthocyanin, and carotenoid biosynthesis. KEGG database mapping of the heat transcriptome indicated reduced gene expression for specific metabolic pathways rather than a global heat response. Targeted metabolomics indicated reduced SGA concentration, but anthocyanin pigments concentration remained unchanged, probably due to their stabilization in the vacuole. Total carotenoid level did not change significantly in potato tuber flesh, but their composition did. Results suggest that growth in hot climates selectively alters tuber secondary metabolism, changing its nutritive value and composition of health-promoting components.

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Abbreviations

ANS:

Anthocyanidin synthase

CHS:

Chalcone synthase

DFR:

Dihydroflavonol 4-reductase

GAME:

Glycoalkaloid metabolism

SGA:

Steroidal glycoalkaloid

SGT:

Solanidine glucosyltransferase

ZEP:

Zeaxanthin epoxidase

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Acknowledgements

This work was supported by the Chief Scientist of the Ministry of Agriculture and Rural Development—Italian-Israel NUTRISOL project (261-0929-14), and is a contribution of the ARO, the Volcani Center, Israel. Authors would like to thank Dr. Mira Weisberg for the SGA metabolite analyses.

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Authors and Affiliations

  1. Agricultural Research Organization, the Volcani Center, Institute of Plant Sciences, 68 HaMaccabim Road, P.O. Box 15159, 7505101, Rishon LeZion, Israel

    Edna Fogelman, Michal Oren-Shamir, Rinat Ovadia, Zachariah Tanami, Adi Faigenboim & Idit Ginzberg

  2. Department of Genetics, Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel

    Joseph Hirschberg

  3. Research Centre for Cereal and Industrial Crops (CREA-CI), Via di Corticella, 133-40128, Bologna, Italy

    Giuseppe Mandolino & Bruno Parisi

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  1. Edna Fogelman
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Table S2

List of genes identified in the phelloderm and tuber flesh transcriptomes including EdgeR analysis of their differential expression (XLSX 6636 kb)

Table S3

Cluster and GO analyses of phelloderm and tuber flesh genes whose expression was modified by the heat treatment (XLSX 174 kb)

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Fogelman, E., Oren-Shamir, M., Hirschberg, J. et al. Nutritional value of potato (Solanum tuberosum) in hot climates: anthocyanins, carotenoids, and steroidal glycoalkaloids. Planta 249, 1143–1155 (2019). https://doi.org/10.1007/s00425-018-03078-y

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