Journal
PHYSIOLOGIA PLANTARUM
Volume 174, Issue 1, Pages -Publisher
WILEY
DOI: 10.1111/ppl.13475
Keywords
abiotic stress; genome-wide analysis; Solanum tuberosum; ubiquitination; U-box
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Funding
- Science and Technology Innovation Funds of Gansu Agricultural University-Scientific research start-up funds for openly-recruited doctors [GAU-KYQD2018-31]
- National Natural Science Foundation of China [31860399]
- Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University [GSCS-2019-2]
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The study revealed a diverse array of U-box genes in the potato genome, which showed significant responses to abiotic stress, particularly enhanced ubiquitination modification under PEG-induced drought stress.
Protein ubiquitination is one of the most important posttranslational modifications in eukaryotic cells, and it is involved in a variety of biological processes, including abiotic stress response. The ubiquitination modification is highly specific, which depends on the accurate recognition of substrate proteins by ubiquitin ligase. Plant U-box (PUB) proteins are a class of ubiquitin ligases, multiple members of which have shown to participate in water-deficit stress in Arabidopsis and rice. U-box gene family and large-scale profiling of the ubiquitome in potato has not been reported to date, although it is one of the most important food crops. The identified 66 U-box genes from the potato genome database were unevenly distributed on 10 chromosomes. These StPUBs have a large number of tandem repeat sequences. Analysis of gene expression characteristics revealed that many StPUBs responded to abiotic stress. Three hundred and fourteen lys modification sites were identified under PEG-induced drought stress, which were distributed on 200 proteins, with 25 differential ubiquitination modification sites, most of which were up-regulated. The ubiquitination modification in potato protein was enhanced under PEG-induced drought stress, and U-box ubiquitin ligase was involved. This study provides an overall strategy and rich data set to clarify the effects of ubiquitination on potatoes under PEG-induced drought stress and the ubiquitination modification involved in potato U-box genes in response to PEG-induced drought stress.
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