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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (4): 697-712.doi: 10.16420/j.issn.0513-353x.2022-0011

• Research Papers •     Next Articles

Expression Analysis of MdTOPP13/28 During Axillary Bud Outgrowth in Malus

LIU Youxian, LI Guofang, TAN Ming, YANG Zhichang, ZHOU Shiwei, HUO Wenjing, ZHANG He, SUN Jianshe, SHAO Jianzhu()   

  1. College of Horticulture,Hebei Agricultural University,Baoding,Hebei 071001,China
  • Received:2022-06-20 Revised:2022-12-07 Online:2023-04-25 Published:2023-04-27
  • Contact: *(E-mail:yysjz@hebau.edu.cn) E-mail:yysjz@hebau.edu.cn

Abstract:

In this study,apple whole-genome data were used to identify and conduct a biological analysis of the MdTOPP gene family. A total of 44 TOPP genes were systematically identified from apple genome,and they distributed on 15 chromosomes. The phylogenetic tree analysis showed that MdTOPP,PpTOPP and AtTOPP were highly homologous;the gene structure and conserved domain analysis showed that 1-2 exons,0-20 introns and 10 conserved motifs were in MdTOPP genes. The promoter cis-acting element analysis showed that the MdTOPP genes were not only affected by the external environment such as light and heat,but also comprehensively regulated by multiple hormones. All the MdTOPP genes have distinctive expression patterns in different apple tissues. MdTOPP13 and MdTOPP28 were identified from the transcriptome data of exogenous cytokinin(6-BA and TDZ)induced apple axillary bud outgrowth,and cloning sequence alignment showed high homology. Using quantitative real-time PCR,the expressions of MdTOPP13 and MdTOPP28 were upregulated after exogenous 6-BA or TDZ applied on the axillary buds of apple rootstock‘SH40’. In summary,MdTOPP13 and MdTOPP28 may play an important role in mediating cytokinin regulation of axillary bud outgrowth.

Key words: apple, TOPP, axillary bud, outgrowth, cytokinin

CLC Number: