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Published on: May 16, 2014
Quantitative proteomics and transcriptomics reveal key metabolic processes associated with cotton fiber initiation
Xu-Chu Wang1, Qin Li2, Xiang Jin3
1The State Key Laboratory of Protein and Plant Gene Research, College of Life Sciences, Peking University, Beijing, 100871, China; Key Laboratory of Biology and Genetic Resources for Tropical Crops, Institute of Tropical Biosciences and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China.
Researchers identified 2729 proteins in wild-type cotton ovules, with key roles in metabolism and hormone regulation. Inhibiting very long-chain fatty acid (VLCFA) biosynthesis suppressed cotton fiber initiation, offering insights into fiber development.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Cotton fiber initiation is crucial for fiber yield.
- Understanding the molecular mechanisms of fiber development is essential.
Purpose of the Study:
- To profile gene expression at transcriptome and proteome levels in cotton ovules.
- To identify key proteins and metabolic pathways involved in cotton fiber cell initiation.
Main Methods:
- iTRAQ-based proteomics and RNA sequencing transcriptomics were performed on upland cotton (Gossypium hirsutum) ovules.
- Quantitative real-time PCR was used to verify gene expression levels.
- Functional analysis involved heterogeneous expression of GhPAS2 in yeast and application of VLCFA inhibitor acetochlor.
Main Results:
- 2729 proteins preferentially accumulated in wild-type ovules at anthesis.
- Upregulated proteins were involved in carboxylic acid metabolism, small-molecule metabolic processes, hormone regulation, and lipid metabolism.
- GhPAS2, involved in very long-chain fatty acid (VLCFA) biosynthesis, accumulated in wild-type ovules; its inhibition suppressed fiber initiation.
Conclusions:
- This study provides a genome-scale transcriptomic and proteomic characterization of cotton fiber initial cells.
- Key metabolic pathways and GhPAS2 are implicated in cotton fiber cell initiation.
- Findings lay a foundation for further investigation into molecular processes governing cotton fiber development.
