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Background Canopy architecture is critical in determining the light environment and subsequently the photosynthetic productivity of fruit crops. Numerous CCT domain-containing genes are crucial for plant adaptive responses to diverse environmental cues. Two  CCT  genes, the orthologues of  AtPRR5  in pear, have been reported to be strongly correlated with photosynthetic performance under distinct canopy microclimates. However, knowledge concerning the specific expression patterns and roles of pear CCT family genes ( PbCCTs ) remains very limited. The key roles played by  PbCCTs  in the light response led us to examine this large gene family in more detail. Results Genome-wide sequence analysis identified 42 putative  PbCCTs  in the genome of pear ( Pyrus bretschneideri  Rehd.). Phylogenetic analysis indicated that these genes were divided into five subfamilies, namely, COL (14 members), PRR (8 members), ZIM (6 members), TCR1 (6 members) and ASML2 (8 members). Analysis of exon–intron structures and conserved domains provided support for the classification. Genome duplication analysis indicated that whole-genome duplication/segmental duplication events played a crucial role in the expansion of the CCT family in pear and that the CCT family evolved under the effect of purifying selection. Expression profiles exhibited diverse expression patterns of  PbCCTs  in various tissues and in response to varying light signals. Additionally, transient overexpression of  PbPRR2  in tobacco leaves resulted in inhibition of photosynthetic performance, suggesting its possible involvement in the repression of photosynthesis. Conclusions This study provides a comprehensive analysis of the  CCT  gene family in pear and will facilitate further functional investigations of  PbCCTs  to uncover their biological roles in the light response.

bmc plant biology

Genome-wide analysis of the CCT gene family in Chinese white pear (Pyrus bretschneideri Rehd.) and characterization of PbPRR2 in response to varying light signals