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Genome-wide identification of the LEA protein gene family in grapevine (Vitis vinifera L.)

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Abstract

The Late Embryogenesis Abundant (LEA) protein gene family is associated with salt and drought stress tolerance in many plant species. However, the number of LEA-encoding genes in the grape (Vitis vinifera) genome has not been previously determined. Here, we conducted a phylogenetic analysis to identify individual members of the LEA gene family in V. vinifera. This analysis identified 60 members of this gene family classified into nine subfamilies (DHN, LEA1, LEA2, LEA3, LEA4, LEA5, LEA6, WHY and SMP) in the grape genome. With 35 members, the LEA2 subfamily constituted the largest subgroup. LEA-encoding genes are non-randomly distributed across most grape chromosomes, suggesting that, similarly to other species, a significant portion of VvLEAs was originated by segmental or tandem duplications. Bioinformatic analyses suggested that the majority of the grape LEA2 proteins is associated with plasma membrane whilst many members of other families are likely to be found in different subcellular locations such as cytoplasm, nucleus and mitochondria. The promoters of these genes contain cis-acting sequence elements associated with stress responses. Expression profiles of a subset of LEA-encoding genes from publically available Affymetrix Vitis vinifera (grape) Genome Array expression data showed that these genes are responsive to salt and dehydration. We also experimentally studied stress-responsive expression patterns of VvDHN1 encoding a dehydrin (DHN) and VvLEA D29L (VvLEA D29Like) encoding a LEA4 protein in the grape cultivar V. vinifera L. cvs. Cabernet Sauvignon (CS) and the rootstock Solonis X riparia 1616 C (1616 C) under salt- and PEG-induced drought stress by qRT-PCR. Both VvDHN1 and VvLEA D29L responded very strongly to these stresses in 1616 C whilst VvLEA D29L was induced only in CS. In response to PEG, VvLEA D29L was induced in both genotypes whilst VvDHN1 showed induction only in CS. Overall, our results suggest the LEA gene family is associated with stress tolerance and manipulation of these genes might provide increased stress tolerance in grapes.

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Acknowledgements

This study is dedicated in memory of Ibrahime Mohammed, who died in 2015.

Funding

IM was supported by a scholarship from the Turks Abroad and Related Communities (YTB) program.

Data archiving statement

The NCBI accession numbers of the Vitis vinifera protein sequences used in phylogenetic analysis are given in the text and also in Supplementary Table 1.

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Authors and Affiliations

Authors

Contributions

AE designed and outlined the research. Mİ, FM, CYÖ and SDA conducted the experiments. UK analysed the data. KK, FM and CYÖ drafted manuscript. AE, KK and BÇA edited the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Ali Ergül.

Additional information

Communicated by M. Troggio

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Electronic supplementary material

Supplementary Table 1

The number of LEA protein family genes identified in the grape genome and their chromosomal locations. (DOCX 18 kb)

Supplementary Table 2

Published examples of LEA gene families in different plant species. (DOCX 17 kb)

Supplementary Table 3

The distribution of various cis-acting promoter elements in the promoters of LEA encoding genes in grapes (Vitis vinifera). (DOCX 18 kb)

Supplementary Table 4

psRNATarget analysis of V. vinifera miRNA targeted LEA encoding genes. (DOCX 22 kb)

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İbrahime, M., Kibar, U., Kazan, K. et al. Genome-wide identification of the LEA protein gene family in grapevine (Vitis vinifera L.). Tree Genetics & Genomes 15, 55 (2019). https://doi.org/10.1007/s11295-019-1364-3

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  • DOI: https://doi.org/10.1007/s11295-019-1364-3

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