Barley necrotic locus nec1 encodes the cyclic nucleotide-gated ion channel 4 homologous to the Arabidopsis HLM1

Nils Rostoks, Deric Schmierer, Sharon Mudie, Thomas Drader, Robert Brueggeman, David G. Caldwell, Robbie Waugh, Andris Kleinhofs

    Research output: Contribution to journalArticlepeer-review

    52 Citations (Scopus)

    Abstract

    Barley homolog of the Arabidopsis necrotic (disease lesion mimic) mutant HLM1 that encodes the cyclic nucleotide-gated ion channel 4 was cloned. Barley gene was mapped genetically to the known necrotic locus nec1 and subsequent sequence analysis identified mutations in five available nec1 alleles confirming barley homolog of Arabidopsis HLM1 as the NEC1 gene. Two fast neutron (FN) induced mutants had extensive deletions in the gene, while two previously described nec1 alleles had either a STOP codon in exon 1 or a MITE insertion in intron 2 which caused alternative splicing, frame shift and production of a predicted non-functional protein. The MITE insertion was consistent with the reported spontaneous origin of the nec1 Parkland allele. The third FN mutant had a point mutation in the coding sequence which resulted in an amino acid change in the conserved predicted cyclic nucleotide-gated ion channel pore region. The expression of two pathogenesis-related genes, HνPR-1a and β-1,3-glucanase, was elevated in two FN necrotic lines. Ten other members of the barley cyclic nucleotide-gated ion channel gene family were identified and their position on barley linkage map is reported.

    Original languageEnglish
    Pages (from-to)159-168
    Number of pages10
    JournalMolecular Genetics and Genomics
    Volume275
    Issue number2
    DOIs
    Publication statusPublished - 1 Feb 2006

    Keywords

    • Cyclic nucleotide-gated ion channel
    • Disease lesion mimic mutant
    • HLM1
    • NEC1
    • Necrotic mutant

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