Fatty acid desaturases and mutant sequences thereof
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Abstract
Seeds, plants and oils are provided having high oleic acid; low linoleic acid; and low linoleic acid plus linolenic acid; and advantageous functional or nutritional properties. Plants are disclosed that contain a mutation in a delta-12 or delta-15 fatty acid desaturase gene. Preferred plants are rapeseed and sunflower plants. Plants carrying such mutant genes have altered fatty acid composition in seeds. In one embodiment, a plant contains a mutation in a region having the conserved motif His-Xaa-Xaa-Xaa-His, found in delta-12 and delta-15 fatty acid desaturases. A preferred motif has the sequence His-Glu-Cys-Gly-His. A preferred mutation in this motif has the amino acid sequence His-Lys-Cys-Gly-His. Nucleic acid fragments are disclosed that comprise a mutant delta-12 or delta-15 fatty acid desaturase gene sequence.
50 Citations
59 Claims
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1-34. -34. (canceled)
- 35. An isolated nucleic acid fragment comprising a sequence of at least about 20 nucleotides from a Brassicaceae delta-15 fatty acid desaturase gene having at least one mutation, wherein said at least one mutation is effective for increasing levels of oleic acid in Brassicaceae seeds and wherein said sequence includes said at least one mutation.
- 43. A Brassicaceae plant containing a sequence of at least 20 nucleotides from a delta-15 fatty acid desaturase gene having at least one mutation, said at least one mutation in a region encoding a His-Xaa-Xaa-Xaa-His amino acid motif and wherein said mutation confers an altered fatty acid composition in seeds of said plant.
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52. A Brassicaceae plant containing:
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a) a sequence of at least 20 nucleotides from a delta-15 fatty acid desaturase gene having at least one mutation, said at least one delta-15 gene mutation in a region encoding a His-Xaa-Xaa-Xaa-His amino acid motif;
b) a sequence of at least 20 nucleotides from a delta-12 fatty acid desaturase gene having at least one mutation, said at least one delta-12 gene mutation in a region encoding a His-Xaa-Xaa-Xaa-His amino acid motif; and
c) said delta-15 gene mutation and said delta-12 gene mutation conferring an altered fatty acid composition in seeds of said plant. - View Dependent Claims (53, 56, 57)
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58. A method for producing a Brassicaceae plant line, comprising the steps of:
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a) inducing mutagenesis in cells of a starting variety of a Brassicaceae species;
b) obtaining progeny plants from said cells;
c) identifying at least one of said progeny plants that contains a delta-15 fatty acid desaturase gene having at least one mutation, said at least one mutation in a region encoding a His-Xaa-Xaa-Xaa-His amino acid motif;
d) producing said plant line from said at least one progeny plant by self-pollination for at least three additional generations. - View Dependent Claims (59)
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Specification