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Proteomic Changes Between Populus Allotriploids and Diploids Revealed Using an iTRAQ-based Quantitative Approach
Yi Wang1,2, Yun Li1,2, Yujing Suo1,2
1National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, College of Biological Sciences and Technology, Beijing Forestry University, No. 35, Qinghua East Road, Beijing100083, China.
Background:
Polyploid breeding is a powerful approach for Populus genetic improve-ment because polyploid trees have valuable characteristics, including better timber quality and a higher degree of stress resistance compared with their full-sib diploids. However, the genetic mech-anism underlying this phenomenon remains unknown.
Objective:
To better understand the proteomic changes between Populus allotriploids and diploids, we examined the proteomic profiles of allotriploid and diploid Populus by iTRAQ labeling coupled with two-dimensional liquid chromatography and MALDI-TOF/TOF mass spectrometry (MS).
Method:
iTRAQ labeling coupled with two-dimensional liquid chromatography and MALDI-TOF/TOF mass spectrometry (MS).
Results:
Between the Populus allotriploid and the full-sib diploid, 932 differentially expressed proteins (DEPs) were identified. These DEPs were primarily involved in stress, defense, transportation, transcriptional and/or translational modification, and energy production. The pathway analysis indi-cated that most of the DEPs were implicated in carbohydrate transport and metabolism, nitrogen me-tabolism and glycolysis, and the ribosome assembly pathway. These data suggest high protein di-vergence between Populus allotriploids and diploids, and rapid changes during hybridization.
Conclusion:
The results provide new data for further understanding of the mechanisms of polyploid trees that generally display increased height growth compared with their full-sib diploids.
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