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Molecular characterization of two lipoxygenases from barley

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Author: Mechelen, J.R. van · Schuurink, R.C. · Smits, M. · Graner, A. · Douma, A.C. · Sedee, N.J.A. · Schmitt, N.F. · Valk, B.E.
Institution: Centraal Instituut voor Voedingsonderzoek TNO
Source:Plant Molecular Biology, 6, 39, 1283-1298
Identifier: 71511
doi: doi:10.1023/A:1006118003998
Keywords: Barley · Chromosomal mapping · Grain dormancy · Hordeum distichum · Jasmonate (jasmonic acid) · Lipoxygenase (LOX) · Chromosomal localization · Complementary DNA · Dormancy · Gene locus · Germination · Lipoxygenase · Messenger RNA · Restriction fragment length polymorphism · Sequence homology · Southern blotting · Amino Acid Sequence · Antibodies, Monoclonal · Base Sequence · Chromosomes · Cloning, Molecular · Gene Dosage · Gene Expression · Genes, Plant · Germination · Hordeum · Isoenzymes · Lipoxygenase · Molecular Sequence Data · Physical Chromosome Mapping · Polymorphism, Restriction Fragment Length · Recombinant Proteins · RNA, Messenger · Sequence Analysis · Sequence Homology, Amino Acid · Embryophyta · Hordeum · Hordeum vulgare subsp. vulgare · Loxa


Two full-length lipoxygenase cDNA sequences (LoxB and LoxC) from barley (Hordeum distichum cv. L. Triumph) are described. The cDNAs share high homology with the barley LoxA cDNA. Southern blotting experiments indicate single copy numbers of the three lipoxygenase genes. RFLP mapping revealed the presence of single lipoxygenase loci. LoxA and LoxB map on chromosome 4 and LoxC on chromosome 7. Two isoenzymes, LOX1 and LOX2, have been purified previously from germinating barley and characterized. LOX1 is encoded by LoxA, while LOX2 is encoded by LoxC. The product related to the third cDNA (loxB) has not been identified so far, suggesting a low protein abundance for the corresponding isoform in barley. Transcripts corresponding with these LOX genes are predominantly observed in grain and in seedling, whereas transcripts corresponding to LoxB and LoxC are also observed in mature vegetative tissue. No lipoxygenase mRNA could be detected in aleurone layer of germinating grain. No significant differences in lipoxygenase mRNA levels were observed in developing grains grown under dormant or non-dormant conditions, suggesting that LOX is not directly involved in induction of grain dormancy. Chemicals/CAS: Antibodies, Monoclonal; Isoenzymes; Lipoxygenase, EC; Recombinant Proteins; RNA, Messenger