Isobaric tags for relative and absolute quantitation-based quantitative proteomics analysis provides novel insights into the mechanism of cross-incompatibility between tree peony and herbaceous peony
Dan He A B , Xue-Yuan Lou A , Song-Lin He C D , Ya-Kai Lei A , Bo-Va Lv A , Zheng Wang A , Yun-Bing Zheng A and Yi-Ping Liu AA College of Forestry, Henan Agricultural University, Zhengzhou 450002, Henan, China.
B Henan Institute of Science and Technology, Postdoctor Researche Base, Xinxiang 453000, Henan, China.
C Henan Institute of Science and Technology, Xinxiang 453000, Henan, China.
D Corresponding author. Email: hsl213@yeah.net
Functional Plant Biology 46(5) 417-427 https://doi.org/10.1071/FP18163
Submitted: 20 June 2018 Accepted: 14 January 2019 Published: 12 February 2019
Abstract
Interspecific hybridisation is the main method for improvement and breeding of tree peony (Paeonia ostii T.Hong & J.X.Zhang), but cross-incompatibility as the major factor restricting the rapid development of interspecific hybridisation. To better understand the molecular mechanisms involved in cross-incompatibility between tree peony (Paeonia ostii cv. Fengdanbai) and herbaceous peony (Paeonia lactiflora Pall. cv. Fenyunu), a quantitative proteomic analysis using isobaric tags for relative and absolute quantitation (iTRAQ) technology was performed on the stigma 24 h after pollination. Of the 2900 proteins whose levels were quantitated, 685 proteins were differentially expressed in the stigma after hybrid pollination, in contrast to self-pollination. Functional annotation analysis showed that dysregulated proteins involved in RNA degradation, the Ca signalling pathway, the phosphatidylinositol signalling system and the mitogen-activated protein kinase (MAPK) signalling pathway may have made contributions to cross-incompatibility. The downregulated expression of enolase, DnaK (Heat Shock Proteins, HSP70), GroEL (Heat Shock Proteins, HSP60), calmodulin and glyoxalase I, and the upregulated expression of adenine nucleotide translocator indicated that the energy synthesis required by pollen tube growth, the signal pathway and the metabolic pathway related to the growth polarity of the pollen tube were blocked after hybrid pollination. Eight genes were selected to confirm their expression by quantitative real-time PCR. Compared with the STRING database, a protein–protein interaction network of the chosen proteins was constructed. These results provide fundamental and important information for research into the molecular mechanisms of cross-incompatibility in peony and should facilitate interspecific hybridisation in agricultural practice.
Additional keywords: interspecific hybridisation, iTRAQ, Paeonia ostii, Paeonia lactiflora.
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