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Interaction between fructan metabolism and plant growth regulators

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Abstract

Main conclusion

The relationship of fructan to plant growth regulators is clearly more complicated than it looks and is likely related to differences between fructan molecules in size and structure as well as localization.

Abstract

Fructans are a complex group of carbohydrates composed mainly of fructose units linked to a sucrose molecule. Fructans are present in plants as heterogeneous mixtures with diverse molecular structures and mass, different polymerization degrees, and linkage types between fructosyl residues. Like sucrose, they are frequently stored in leaves and other organs, acting as carbohydrate reserves. Fructans are synthesized in the cell vacuole by fructosyltransferase enzymes and catabolized by fructan exohydrolase enzymes. Several publications have shown that fructan metabolism varies with the stage of plant development and in response to the environment. Recent studies have shown a correlation between plant growth regulators (PGR), fructan metabolism, and tolerance to drought and cold. PGR are compounds that profoundly influence the growth and differentiation of plant cells, tissues, and organs. They play a fundamental role in regulating plant responses to developmental and environmental signals. In this review, we summarize the most up-to-date knowledge on the metabolism of fructans and their crosstalk with PGR signaling pathways. We identify areas that require more research to complete our understanding of the role of fructans in plants.

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Fig. 1
Fig. 2

source to sink organs. B The involvement of PGR in fructan degradation. CiMYB3, CiMYB5, and CiMYB17 transcription factors control the expression of 1-FEH1 and 1-FEH2. The figure shows the signaling pathways of ABA, auxin, GA, and ethylene. ABA induces the expression of CiMYB3, CiMYB5, and CiMYB17 and a co-expression of 1-FEH1 and 1-FEH2. On the other hand, 1-FEH1 has motifs for response to auxin (ASF1, ARF, and CATATGGMSAUR), abscisic acid (ABRE), ethylene (GC box and ERE), and gibberellin (GARE) that may be involved in the control of its expression. However, more detailed analysis is required to determine their role in 1-FEH1 gene expression

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Acknowledgements

This research was supported by the Research and Postgraduate Studies Secretariat (SIP) of the  Instituto Politécnico Nacional (IPN-México) (Projects 20210545 and PRO21DTIA, Fructans from Agave angustifolia and A. potatorum during their life cycle and potential use). During the writing of this paper, REML was supported by a CONACYT (N° 788256) Doctoral Fellowship.

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All authors contributed to the intellectual discussion underlying this paper, literature exploration, writing, reviews and approve the published version and take responsibility for its content.

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Correspondence to Patricia Araceli Santiago-García.

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None of the authors has any conflict of interest that could affect the performance of the work or the interpretation of the data.

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Communicated by Gerhard Leubner.

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Márquez-López, R.E., Loyola-Vargas, V.M. & Santiago-García, P.A. Interaction between fructan metabolism and plant growth regulators. Planta 255, 49 (2022). https://doi.org/10.1007/s00425-022-03826-1

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