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Constitutive expression of two apple (Malus × domestica Borkh.) homolog genes of LIKE HETEROCHROMATIN PROTEIN1 affects flowering time and whole-plant growth in transgenic Arabidopsis

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Abstract

Fruit trees, such as apple (Malus × domestica Borkh.), are woody perennial plants with a long juvenile phase. The biological analysis for the regulation of flowering time provides insights into the reduction of juvenile phase and the acceleration of breeding in fruit trees. In Arabidopsis, LIKE HETEROCHROMATIN PROTEIN1 (LHP1) is involved in epigenetic silencing of the target genes such as flowering genes. We isolated and characterized twin apple LHP1 homolog genes, MdLHP1a and MdLHP1b. These genes may have been generated as a result of ancient genome duplication. Although the putative MdLHP1 proteins showed lower similarity to any other known plant LHP1 homologs, a chromo domain, a chromo shadow domain, and the nuclear localization signal motifs were highly conserved among them. RT-PCR analysis showed that MdLHP1a and MdLHP1b were expressed constantly in developing shoot apices of apple trees throughout the growing season. Constitutive expression of MdLHP1a or MdLHP1b could compensate for the pleiotropic phenotype of lhp1/tfl2 mutant, suggesting that apple LHP1 homolog genes are involved in the regulation of flowering time and whole-plant growth. Based on these results, LHP1 homolog genes might have rapidly evolved among plant species, but the protein functions were conserved, at least between Arabidopsis and apple.

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Abbreviations

FBS:

Fruit-bearing shoot

LD:

Long-day

SD:

Short-day

SS:

Succulent shoot

VS:

Vegetative shoot

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Acknowledgments

We thank Dr. H. Ichikawa, National Institute of Agrobiological Sciences (Tsukuba, Japan), for kindly providing the binary vectors, pSMAK312Blue and pSMAK193E. We also thank Dr. E.E. Hood, Texas A&M University College Station, for kindly providing Agrobacterium tumefaciens EHA101. A. thaliana tfl2-2 seeds were kindly provided by the Arabidopsis Biological Resource Center at Ohio State University. This work was supported by the “PROBRAIN (Program for Promotion of Basic Research Activities for Innovative Biosciences)” from the Bio-Oriented Technology Research Advancement Institution (BRAIN). This publication constitutes the contribution number 1445 of the National Institute of Fruit Tree Science.

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Correspondence to Nobuhiro Kotoda.

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Communicated by S. Hohmann.

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438_2007_250_MOESM1_ESM.pdf

S1. Restriction fragments of PCR products of the MdLHP1a gene PCR products of the MdLHP1a gene corresponding to the probe region used in Southern blot analysis were digested with EcoRI, PstI, BamHI, or EcoRV. The molecular size marker is shown in kbp on the left. (PDF 69.6 kb)

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Mimida, N., Kidou, Si. & Kotoda, N. Constitutive expression of two apple (Malus × domestica Borkh.) homolog genes of LIKE HETEROCHROMATIN PROTEIN1 affects flowering time and whole-plant growth in transgenic Arabidopsis . Mol Genet Genomics 278, 295–305 (2007). https://doi.org/10.1007/s00438-007-0250-0

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