Abstract
The B subfamily of ATP-binding cassette (ABC) proteins (ABCB) plays a vital role in auxin efflux. However, no systematic study has been done in apple. In this study, we performed genomewide identification and expression analyses of the ABCB family in Malus domestica for the first time. We identified a total of 25 apple ABCBs that were divided into three clusters based on the phylogenetic analysis. Most ABCBs within the same cluster demonstrated a similar exon–intron organization. Additionally, the digital expression profiles of ABCB genes shed light on their functional divergence. ABCB1 and ABCB19 are two well-studied auxin efflux carrier genes, and we found that their expression levels are higher in young shoots of M106 than in young shoots of M9. Since young shoots are the main source of auxin synthesis and auxin efflux involves in tree height control. This suggests that ABCB1 and ABCB19 may also take a part in the auxin efflux and tree height control in apple.
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Acknowledgements
This work was supported by the National Science and Technology Supporting Project (2013BAD20B03), National Apple Industry Technology System of Agriculture Ministry of China (CARS-28) and the Major Innovation of Science and Technology Project of Shaanxi Province (2011KTZB02-02-05).
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Ma J. J. and Han M. 2016 Genomewide analysis of ABCBs with a focus on ABCB1 and ABCB19 in Malus domestica. J. Genet. 95, xx–xx
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MA, J.J., HAN, M. Genomewide analysis of ABCBs with a focus on ABCB1 and ABCB19 in Malus domestica . J Genet 95, 141–149 (2016). https://doi.org/10.1007/s12041-016-0614-5
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DOI: https://doi.org/10.1007/s12041-016-0614-5