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Open AccessArticle

Expression and Regulation of PpEIN3b during Fruit Ripening and Senescence via Integrating SA, Glucose, and ACC Signaling in Pear (Pyrus pyrifolia Nakai. Whangkeumbae)

by Haiyan Shi 1,*,†, Yuxing Zhang 1,† and Liang Chen 2,*
1
Pear Engineering and Technology Research Center of Hebei, College of Horticulture, Agricultural University of Hebei, Baoding 071001, China, [email protected]
2
Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
*
Authors to whom correspondence should be addressed.
Haiyan Shi and Yuxing Zhang contributed equally to this work.
Genes 2019, 10(6), 476; https://doi.org/10.3390/genes10060476
Received: 17 May 2019 / Revised: 6 June 2019 / Accepted: 19 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Hormonal Control of Gene Expression in Plants)
The economic value of fruit is reduced by having a short shelf life. Whangkeumbae is a type of sand pear (Pyrus pyrifolia) considered a climacteric fruit. The pear is famous for its smooth surface and good flavor. However, its shelf life is very short because of senescence and disease after harvest and a burst of ethylene (ET) production prompting the onset of fruit ripening. In plants, ETHYLENE INSENSITIVE3 (EIN3) and EIN3like (EIL), located in the nucleus, are important components of the ET signaling pathway and act as transcription factors. EIN3s and EILs belong to a small family involved in regulating the expression of ethylene response factor gene (ERF), whose encoding protein is the final component in the ET signaling pathway. The mutation of these components will cause defects in the ethylene pathway. In this study, one gene encoding an EIN3 was cloned and identified from Whangkeumbae and designated PpEIN3b. The deduced PpEIN3b contained a conserved EIN3 domain, a bipartite nuclear localization signal profile (NLS_BP), and an N-6 adenine-specific DNA methylase signature (N6_MTASE). PpEIN3b belongs to the EIN3 super-family by phylogenetic analysis. Quantitative RT-PCR (qRT-PCR) analysis revealed that PpEIN3b was preferentially expressed in fruit. Additionally, its expression was developmentally regulated during fruit ripening and senescence. Furthermore, PpEIN3b transcripts were obviously repressed by salicylic acid (SA) and glucose treatment in pear fruit and in diseased fruit, while it was significantly induced by 1-aminocyclopropane-1-carboxylic acid (ACC) treatment. Taken together, our results reveal the expression and regulation profiles of PpEIN3b and suggest that PpEIN3b might integrate SA, glucose, and ACC signaling to regulate fruit ripening and senescence in pear, which would provide a candidate gene for this regulation to obtain fruit with a long shelf life and improved economic value. View Full-Text
Keywords: pear (Pyrus pyrifolia Nakai. Whangkeumbae); ethylene insensitive3; salicylic acid; gene expression; fruit ripening and senescence pear (Pyrus pyrifolia Nakai. Whangkeumbae); ethylene insensitive3; salicylic acid; gene expression; fruit ripening and senescence
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Shi, H.; Zhang, Y.; Chen, L. Expression and Regulation of PpEIN3b during Fruit Ripening and Senescence via Integrating SA, Glucose, and ACC Signaling in Pear (Pyrus pyrifolia Nakai. Whangkeumbae). Genes 2019, 10, 476.

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