Abstract
Gibberellic acids (GAs) have multiple functions in various stages of plant growth and wood development, and GA receptor GIBBERELLIN INSENSITIVE DWARF 1 (GID1) is a key player in GA signaling. Here, we used association studies to examine the allelic variation within PtoGID1a and PtoGID1b associated with growth and wood properties in a natural population of Populus tomentosa. We isolated two full-length PtoGID1a and PtoGID1b cDNA by reverse transcription PCR, and both of these two genes had an open reading frame with the same length (1035 bp) and encoded a protein of 344 amino acids. Analysis of tissue-specific expression profiles indicated that these two genes had similar transcription patterns, being expressed predominantly in leaves. Nucleotide diversity and linkage disequilibrium (LD) analysis showed that PtoGID1a and PtoGID1b harbor high single nucleotide polymorphism (SNP) diversity (π Τ = 0.08237 and 0.00921, respectively) and low LD (r 2 > 0.1, within 350 and 1000 bp, respectively). SNP- and haplotype-based association tests identified that six single SNPs (Q < 0.05) and six haplotypes (P < 0.05, Q < 0.10) were significantly associated with growth and wood properties, explaining 0.99–10.28 and 3.10–5.39 % of the phenotypic variance, respectively. Therefore, isolation of PtoGID1a and PtoGID1b and dissection of their allelic polymorphisms open an avenue to understand the regulation of PtoGID1 in the growth and wood formation in trees.
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Acknowledgments
This work was supported by the National “863” Plan Project (No. 2013AA102702) and the Project of the National Natural Science Foundation of China (No. 31670333).
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Sequence data from this article has been deposited in the GenBank Data Library under the accession Nos. KU161176–KU161220 and KU161221–KU161265.
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Fig. S1
Putative amino acid sequence alignment of PtoGID1a and PtoGID1b with other plant GID1s. Numbers on the right represent the positions of amino acid residues in each protein. Sequences in the gray boxes refer to the highly conserved domains HGG and GXGSXG of GID1 and HSL. The arrows show the three catalytic centers S (Ser), D (Asp), and H (His) of HSL family. Thirteen binding domains for GA-GID1-DELLA (TWVLIS, LDR, FFHGGSF, HS, IYD, YRR, DGW, GDSSGGNI, GNI, MF, LDGKYF, WYW, and GFY) are indicated in bold font. (GIF 449 kb)
Fig. S2
Pairwise linkage disequilibrium (r 2) between SNP markers. (a) Thirteen distinct haplotype blocks within PtoGID1a. (b) Four distinct haplotype blocks within PtoGID1b. The pairwise r 2 values are shown in color. Within each block, LD among the SNPs was high (r 2 > 0.75). Dashed lines indicate the physical location of the SNPs within PtoGID1a and PtoGID1b. (GIF 312 kb)
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Yang, H., Yang, X., Wang, L. et al. Single nucleotide polymorphisms in two GID1 orthologs associate with growth and wood property traits in Populus tomentosa . Tree Genetics & Genomes 12, 109 (2016). https://doi.org/10.1007/s11295-016-1070-3
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DOI: https://doi.org/10.1007/s11295-016-1070-3