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Systems biology and genome-wide approaches to unveil the molecular players involved in the pre-germinative metabolism: implications on seed technology traits

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Abstract

The pre-germinative metabolism is among the most fascinating aspects of seed biology. The early seed germination phase, or pre-germination, is characterized by rapid water uptake (imbibition), which directs a series of dynamic biochemical events. Among those are enzyme activation, DNA damage and repair, and use of reserve storage compounds, such as lipids, carbohydrates and proteins. Industrial seedling production and intensive agricultural production systems require seed stocks with high rate of synchronized germination and low dormancy. Consequently, seed dormancy, a quantitative trait related to the activation of the pre-germinative metabolism, is probably the most studied seed trait in model species and crops. Single omics, systems biology, QTLs and GWAS mapping approaches have unveiled a list of molecules and regulatory mechanisms acting at transcriptional, post-transcriptional and post-translational levels. Most of the identified candidate genes encode for regulatory proteins targeting ROS, phytohormone and primary metabolisms, corroborating the data obtained from simple molecular biology approaches. Emerging evidences show that epigenetic regulation plays a crucial role in the regulation of these mentioned processes, constituting a still unexploited strategy to modulate seed traits. The present review will provide an up-date of the current knowledge on seed pre-germinative metabolism, gathering the most relevant results from physiological, genetics, and omics studies conducted in model and crop plants. The effects exerted by the biotic and abiotic stresses and priming are also addressed. The possible implications derived from the modulation of pre-germinative metabolism will be discussed from the point of view of seed quality and technology.

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Acknowledgments

The financial support from University of Pavia (Italy) and Fundação para a Ciência e a Tecnologia (Lisbon, Portugal) is acknowledged through the research unit “GREEN-it: Bioresources for Sustainability” (UID/Multi/04551/2013), as well as S.S.A. post-doctoral grant (SFRH/BPD/108032/2015). A.P. has been awarded with a PhD fellowship granted by the IUSS-Institute for Advanced Study of Pavia. This work has been partially supported by Reg.CE n. 1698/2005 Programma di Sviluppo rurale per la Puglia 2007/2013 (Misura 214—Azione 4 Sub azione a) “SaVeGraINPuglia—Progetti integrati per la Biodiversità-Recupero, caratterizzazione, salvaguardia e valorizzazione di leguminose, cereali da granella e foraggio in Puglia”.Network sponsorship from COST Action FA1306 Plant Phenotyping “The quest for tolerant varieties—phenotyping at the plant and cellular level” is acknowledged.

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Correspondence to Susana S. Araújo.

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The authors declare that they have no conflict of interest.

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Communicated by N. Sreenivasulu.

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Macovei, A., Pagano, A., Leonetti, P. et al. Systems biology and genome-wide approaches to unveil the molecular players involved in the pre-germinative metabolism: implications on seed technology traits. Plant Cell Rep 36, 669–688 (2017). https://doi.org/10.1007/s00299-016-2060-5

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  • DOI: https://doi.org/10.1007/s00299-016-2060-5

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