›› 2020, Vol. 32 ›› Issue (7): 1206-1214.DOI: 10.3969/j.issn.1004-1524.2020.07.09

• Horticultural Science • Previous Articles     Next Articles

Isolation and expression of floral organ development regulating gene LiFUL1 in Lagerstroemia indica L.

HUANG Xiaozhen1,2, QIAO Zhongquan1,*, ZENG Huijie1, LI Yongxin1,3, HE Gang2, WANG Xiaoming1   

  1. 1. Hunan Key Laboratory for Breeding of Clonally Propagated Forest Trees, Hunan Academy of Forestry, Changsha 410004, China;
    2. College of Life Science of Biotechnology, Central South University of Forestry & Technology, Changsha 410004, China;
    3. Changsha Woody Flower Engineering Technology Research Center, Changsha 410004, China
  • Received:2020-02-01 Online:2020-07-25 Published:2020-07-28

Abstract: Flowers of crape myrtle Xiangyun are not strong enough to seeding, the manifestations of Xiangyun are indehiscent anther, pollen abortion and abnormal ovule. Redleaf is common crape myrtle with normal flowering and bearing. Crape myrtle Xiangyun was selected as the experimental material, RT-PCR was employed to isolate a homologous gene of FRUITFULL (FUL) from Xiangyun, named as LiFUL1(GenBank accession No. MN894547). Sequence analysis indicated that length of the open reading frame of LiFUL1 cDNA was 753 bp, which encoded a protein with 251 amino acids, its molecular weight was 28.453 13 ku. Analysis of sequence alignment and conserved structural domain showed that LiFUL1 protein belonged to FUL/AP1, a subfamily of the MADS, for it had both typical MADS-MEF2 and K-box domain, and the highly conserved motif euFUL MOTIF at C terminus. Phylogenetic tree analysis revealed that LiFUL1 of crape myrtle was most closely related to Eucalyptus globulus’s FUL/AP1 sequence. qRT-PCR test demonstrated that expressions of LiFUL1 in Xiangyun were significantly higher than those in crape myrtle Redleaf at calyx differentiation, petals and stamens differentiation, stamens and pistils differentiation stages. Successful expression of LiFUL1 in Escherichia coli using the prokaryotic expression system provided a basis for further study of LiFUL1 gene function.

Key words: crape myrtle, LiFUL1, genetic relationship, prokaryotic expression, RT-qPCR

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