Characterization of TaCOMT genes associated with stem lignin content in common wheat and development of a gene-specific marker
Stem lignin content (SLC) in common wheat (Triticum aestivum L.) contributes to lodging resistance. Caffeic acid 3-O-methyltransferase (COMT) is a key enzyme involved in lignin biosynthesis. Characterization of TaCOMT genes and development of gene-specific markers could enable marker-assisted selection in wheat breeding. In the present study, the full-length genomic DNA (gDNA) sequences of TaCOMT genes located on chromosomes 3A, 3B, and 3D were cloned by homologous cloning. Two allelic variants, TaCOMT-3Ba and TaCOMT-3Bb, were identified and differed by a 222-bp insertion/deletion (InDel) in the 3´-untranslated region (3´-UTR). A co-dominant gene-specific marker based on this InDel was developed and designated as TaCOMT-3BM. A total of 157 wheat cultivars and advanced lines grown in four environments were used to validate the associations between allelic patterns and SLC. The SLC of cultivars with TaCOMT-3Ba was significantly (P<0.01) higher than that of those with TaCOMT-3Bb, and the marker TaCOMT-3BM could be effectively used in wheat breeding.
| Main Authors: | , , , , , , , |
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| Format: | Article biblioteca |
| Language: | English |
| Published: |
Elsevier
2019
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| Subjects: | TRITICUM AESTIVUM, GENETICS, LODGING RESISTANCE, |
| Online Access: | https://hdl.handle.net/10883/20441 |
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| Summary: | Stem lignin content (SLC) in common wheat (Triticum aestivum L.) contributes to lodging resistance. Caffeic acid 3-O-methyltransferase (COMT) is a key enzyme involved in lignin biosynthesis. Characterization of TaCOMT genes and development of gene-specific markers could enable marker-assisted selection in wheat breeding. In the present study, the full-length genomic DNA (gDNA) sequences of TaCOMT genes located on chromosomes 3A, 3B, and 3D were cloned by homologous cloning. Two allelic variants, TaCOMT-3Ba and TaCOMT-3Bb, were identified and differed by a 222-bp insertion/deletion (InDel) in the 3´-untranslated region (3´-UTR). A co-dominant gene-specific marker based on this InDel was developed and designated as TaCOMT-3BM. A total of 157 wheat cultivars and advanced lines grown in four environments were used to validate the associations between allelic patterns and SLC. The SLC of cultivars with TaCOMT-3Ba was significantly (P<0.01) higher than that of those with TaCOMT-3Bb, and the marker TaCOMT-3BM could be effectively used in wheat breeding. |
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