Candidates responsible for dwarf pear phenotype as revealed by comparative transcriptome analysis
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Dwarfism is an important character in fruit production for intensive cultivation and effective orchard management. We previously located a single dominant gene at a narrow region on scaffold00074 of pear based on simple sequence repeat markers. To identify the gene and fully understand the different developmental processes, we conducted a transcriptomic analysis of the young apical stem between dwarf and standard pears. A total of 2170 differentially expressed genes (DEGs), of which 987 were down-regulated and 1183 were up-regulated, were determined. These DEGs were mainly involved in ribosome biogenesis, phenylpropanoid biosynthesis, photosynthesis, porphyrin and chlorophyll metabolism and DNA replication. Subsequently, a classical arabinogalactan protein 7-like gene (PCP021014) and a protein WVD2-like 7 gene (PCP021015) were identified as the most likely candidates for the PcDw locus on the basis of the DEGs and annotation of scaffold00074. Furthermore, we performed qRT-PCR to validate the expression patterns of 12 DEGs associated with the dwarf character. Our results provide a systemic viewpoint into the complex regulatory networks between the dwarf and standard pear phenotypes.
KeywordsPear Dwarf Phenotype Transcriptome DEG PcDw
This study was supported by the National Natural Science Foundation of China (31372049) and the Funds for Modern Agricultural Industry Technology System in Shandong Province, China (SDAIT-06-06).
Compliance with ethical standards
Conflict of interest
The authors declare that we have no conflict of interest.
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