Characterization and gene mapping of a brittle culm mutant of diploid wheat (Triticum monococcum L.) with irregular xylem vessels development
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Abstract
Diploid wheat, Triticum monococcum L. (einkorn) is an ideal plant material for wheat functional genomics. Brittle culm mutant was identified by screening of the ethyl methane sulphonate-treated M2 progenies of a T. monococcum accession pau14087 by banding the plant parts manually. The brittle culm mutant with drooping leaves, early flowering, reduced tiller numbers and susceptible to lodging had also exhibited brittleness in all plant parts than the wild-type parents. Comprehensive mechanical strength, histological, biochemical, scanning electron microscopy, and Fourier transform infrared spectroscopy analyses of brittle culm mutant supplemented and complemented the findings that the mutant had defective cellulose biosynthesis pathway and deposition of cell wall materials on secondary cell wall of mechanical tissues. Microscopic studies demonstrated that the decrease in cellulose contents resulted in the irregular cell wall organization in xylem vessels of leaf vascular bundles. To map the brc5 mutant, mapping populations were developed by crossing the brittle culm mutant with wild Triticum boeoticum acc. pau5088, having non-brittle characters. The brittle culm mutation was mapped between SSR markers, Xcfd39 and Xgwm126 on 5AmL chromosome of T. monococcum, with genetic distances of 2.6 and 4.8 cM, respectively. The brc5 mutant mapped on 5AmL, being distinct from a previously mapped brittle culm mutant in wheat, has been designated as brc5. The work on fine mapping and map-based cloning of brc5 gene regulating synthesis and deposition of cellulose on the secondary cell wall is in progress.
Keywords
brc5 mutant Cellulose Gene mapping Irregular xylem vessels SSR marker Triticum monococcum (L.)Abbreviations
- BSA
Bulk segregant analysis
- brc5
Brittle culm mutant 5
- EMS
Ethyl methane sulfonate
- IIT
Indian Institute of Technology
- M2
Second generation after mutagenesis
- F2
Second filial generation
- PCR
Polymerase chain reaction
- RILs
Recombinant inbred lines
- SEM
Scanning electron microscopy
- FTIR
Fourier transform infrared spectroscopy
- VBs
Vascular bundles
- TS
Transverse section
- WT
Wild-type
Notes
Acknowledgments
The authors are grateful to Deanship of Scientific Research and College of Food and Agriculture Science Research, King Saud University Riyadh for providing research support.
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