Abstract
In planta the enzymatic activity of apoplastic and vacuolar invertases is controlled by inhibitory proteins. Although these invertase inhibitors (apoplastic and vacuolar forms) have been implicated as contributing to resistance to cold-induced sweetening (CIS) in tubers of potato (Solanum tuberosum L.), there is a lack of information on the structure and allelic diversity of the apoplastic invertase inhibitor genes. We have PCR-isolated and sequenced the alleles of the apoplastic invertase inhibitor gene (Stinh1) from three tetraploid potato genotypes: 1021/1 (a genotype with very high tolerance to CIS), ‘Karaka’ and ‘Summer Delight’ (two cultivars that are highly susceptible to CIS). In total, five alleles were identified in these genotypes, of which four (Stinh1-c, Stinh1-d, Stinh1-e, Stinh1-f) were novel. An analysis of allele diversity was conducted by incorporating previously published sequences of apoplastic invertase inhibitors from potato. Eight alleles were assessed for sequence polymorphism in the two exons and the single hypervariable intron. Contrary to the hypervariable intron, only 65 single nucleotide polymorphisms were observed in the exons, of which 42 confer amino acid substitutions. Phylogenetic analysis of amino acid sequences indicates that the alleles of the invertase inhibitor are highly conserved amongst members of the Solanaceae family.
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Acknowledgments
We would like to thank Russell Genet for supplying potato tubers, Samantha Baldwin for help in primer design, and Mei Meiyalaghan and Mark Fiers for stimulating discussions. This work was supported by Ministry of Science & Innovation (New Zealand) contract C02X0805 to The New Zealand Institute for Plant & Food Research Limited, New Zealand, and grants from Lincoln University, New Zealand (SSD) and a New Zealand International Doctoral Research Scholarship (SSD).
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Communicated by C. Gebhardt.
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Supplementary Fig 1 Alignment of the genomic sequences of apoplastic invertase inhibitor alleles. Comparative alignment of the genomic sequences of the apoplastic invertase inhibitor alleles identified in the present study with sequences of apoplastic invertase inhibitors previously isolated from potato. ‘DM1-3 516 R44′ is superscaffold PGSC0003DMB000000114 (position 619958 to 618056) from the potato genome sequence (The Potato Genome Sequencing Consortium, 2011); Stinvinh1 (GU321338) and Stinvinh3 (GU321339) (Liu et al. 2010). Primer sites are highlighted in yellow with forward and reverse arrows, exons are in bold with a red box around the start and stop codons, substitutions/indels are shaded gray, “-“indicates a deletion or absence of sequence information. The conserved 5′GT and 3′AG dinucleotides at the exon/intron boundaries are indicated by blue arrows. Predicted changes in the amino acid sequence are presented in their one letter code below the corresponding underlined nucleotide codon. SumDel = ‘Summer Delight’.
Supplementary Table 1Nucleotide polymorphism in the putative mRNA of invertase inhibitor alleles. Nucleotide sequence and amino acid differences in the predicted mRNA sequences of invertase inhibitor alleles compared with the allele inh1-a (GenBank accession number AY864819). Only polymorphisms in the exons are presented. SNPs in StInvInh3 at nt 78 (C to T) and inh1-c at nt 266 (A to G) do not cause a change in amino acid. The numbering is as in Supplementary Figure 1. StInvInh1 and StInvInh3, Liu et al 2010.
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Datir, S.S., Latimer, J.M., Thomson, S.J. et al. Allele diversity for the apoplastic invertase inhibitor gene from potato. Mol Genet Genomics 287, 451–460 (2012). https://doi.org/10.1007/s00438-012-0690-z
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DOI: https://doi.org/10.1007/s00438-012-0690-z