The plant genes encoding ABCGs that have been identified to date
play a role in suberin formation in response to abiotic and biotic stress. In
the present study, 80 ABCG genes were identified in
‘Dangshansuli’ Chinese white pear and designated as PbABCGs.
Based on the structural characteristics and phylogenetic analysis, the
PbABCG family genes could be classified into seven main
groups: classes A-G. Segmental and dispersed duplications were the primary
forces underlying the PbABCG gene family expansion in
‘Dangshansuli’ pear. Most of the PbABCG duplicated gene pairs
date to the recent whole-genome duplication that occurred 30~45 million years
ago. Purifying selection has also played a critical role in the evolution of the
ABCG genes. Ten PbABCG genes screened in
the transcriptome of ‘Dangshansuli’ pear and its russet mutant ‘Xiusu’ were
validated, and the expression levels of the PbABCG genes
exhibited significant differences at different stages. The results presented
here will undoubtedly be useful for better understanding of the complexity of
the PbABCG gene family and will facilitate the functional
characterization of suberin formation in the russet mutant.
Michelia compressa is an evergreen ornamental tree species. The high-throughput sequencing technology was used to sequence and assemble the chloroplast genome of Michelia compressa. Results showed that the chloroplast genome is 160,061 bp in length, of which the inverted repeats sequence (IRs) is 26,581 bp, the large single-copy region (LSC) and the small single copy region (SSC) are 88,097 bp and 18,802 bp, respectively. The GC content of the plastome was 39.2%, with 43.2%, 37.9% and 34.2% in IRs, LSC and SSC, respectively. A total of 132 genes are annotated, 86 protein-coding genes, 37 tRNA genes, and 8 rRNA genes. This study enriched the Michelia compressa genomic information which provides the basis for rational exploitation and utilization of germplasm resources.
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