Journal
GENES
Volume 12, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/genes12010023
Keywords
Solanum lycopersicum; protein disulfide isomerases; genome-wide analysis; gene expression; abiotic stress; fruit development
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2018R1A2B6001781]
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Protein disulfide isomerases (PDI) and PDI-like proteins play a crucial role in catalyzing protein disulfide bond formation and isomerization in the endoplasmic reticulum, preventing the accumulation of misfolded proteins under abiotic stress conditions. In tomato, 19 PDI genes were identified, with most showing differential expression across organs and developmental stages, and being highly induced by heat, salt, and ABA treatments. The predominant expression of specific PDI genes in response to abiotic stress and ABA treatment suggests their regulatory roles in abiotic stress tolerance in a tomato.
Protein disulfide isomerases (PDI) and PDI-like proteins catalyze the formation and isomerization of protein disulfide bonds in the endoplasmic reticulum and prevent the buildup of misfolded proteins under abiotic stress conditions. In the present study, we conducted the first comprehensive genome-wide exploration of the PDI gene family in tomato (Solanum lycopersicum L.). We identified 19 tomato PDI genes that were unevenly distributed on 8 of the 12 tomato chromosomes, with segmental duplications detected for 3 paralogous gene pairs. Expression profiling of the PDI genes revealed that most of them were differentially expressed across different organs and developmental stages of the fruit. Furthermore, most of the PDI genes were highly induced by heat, salt, and abscisic acid (ABA) treatments, while relatively few of the genes were induced by cold and nutrient and water deficit (NWD) stresses. The predominant expression of SlPDI1-1, SlPDI1-3, SlPDI1-4, SlPDI2-1, SlPDI4-1, and SlPDI5-1 in response to abiotic stress and ABA treatment suggested they play regulatory roles in abiotic stress tolerance in tomato in an ABA-dependent manner. Our results provide new insight into the structure and function of PDI genes and will be helpful for the selection of candidate genes involved in fruit development and abiotic stress tolerance in tomato.
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