Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces
Wheat (Triticumaestivum L.) is a major cereal crop grown across a wide range of environments, but its productivity around the world is challenged by various biotic and abiotic factors. Wheat landraces from around the world are a source of unexploited genetic diversity that can be essential for moder...
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MDPI AG
2018-06-01
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| Series: | Agronomy |
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| Online Access: | http://www.mdpi.com/2073-4395/8/6/95 |
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| author | Jinita Sthapit Kandel Meng Huang Zhiwu Zhang Daniel Z. Skinner Deven R. See |
| author_facet | Jinita Sthapit Kandel Meng Huang Zhiwu Zhang Daniel Z. Skinner Deven R. See |
| author_sort | Jinita Sthapit Kandel |
| collection | DOAJ |
| description | Wheat (Triticumaestivum L.) is a major cereal crop grown across a wide range of environments, but its productivity around the world is challenged by various biotic and abiotic factors. Wheat landraces from around the world are a source of unexploited genetic diversity that can be essential for modern wheat-breeding programs in search of resistance to abiotic stresses like freezing tolerance. This genetic diversity study of 553 winter wheat landraces based on single-nucleotide polymorphisms (SNPs) revealed separate clusters of landraces related to the latitude of origin. Linkage block analysis revealed genomic regions with specific alleles skewed towards landraces from higher latitudes, suggesting that migration to higher latitudes resulted in the fixing of specific alleles. Electrolyte leakage was used to measure the tolerance of freezing to −14 °C, −16 °C, and −18 °C of 192 landraces. There was a significant negative correlation between latitude and electrolyte leakage, with an R2 value of 0.14, (p < 0.0001), in a regression analysis indicating greater freezing tolerance in landraces from higher latitudes. Genome-wide association studies identified regions in chromosomes 4A and 6A associated with higher latitudes and freezing tolerance, respectively. Landraces with freezing tolerance may be useful in developing new germplasm as novel sources of greater cold hardiness. |
| first_indexed | 2024-12-17T00:32:41Z |
| format | Article |
| id | doaj.art-c9155bfc48a741bb9dfc5a0d679ba914 |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-12-17T00:32:41Z |
| publishDate | 2018-06-01 |
| publisher | MDPI AG |
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| series | Agronomy |
| spelling | doaj.art-c9155bfc48a741bb9dfc5a0d679ba9142022-12-21T22:10:14ZengMDPI AGAgronomy2073-43952018-06-01869510.3390/agronomy8060095agronomy8060095Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat LandracesJinita Sthapit Kandel0Meng Huang1Zhiwu Zhang2Daniel Z. Skinner3Deven R. See4Department of Plant Pathology, Washington State University, Pullman, WA 99164, USADepartment of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USADepartment of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USAWheat Health, Genetics, and Quality Research Unit, USDA-ARS and Washington State University, Pullman, WA 99164, USADepartment of Plant Pathology, Washington State University, Pullman, WA 99164, USAWheat (Triticumaestivum L.) is a major cereal crop grown across a wide range of environments, but its productivity around the world is challenged by various biotic and abiotic factors. Wheat landraces from around the world are a source of unexploited genetic diversity that can be essential for modern wheat-breeding programs in search of resistance to abiotic stresses like freezing tolerance. This genetic diversity study of 553 winter wheat landraces based on single-nucleotide polymorphisms (SNPs) revealed separate clusters of landraces related to the latitude of origin. Linkage block analysis revealed genomic regions with specific alleles skewed towards landraces from higher latitudes, suggesting that migration to higher latitudes resulted in the fixing of specific alleles. Electrolyte leakage was used to measure the tolerance of freezing to −14 °C, −16 °C, and −18 °C of 192 landraces. There was a significant negative correlation between latitude and electrolyte leakage, with an R2 value of 0.14, (p < 0.0001), in a regression analysis indicating greater freezing tolerance in landraces from higher latitudes. Genome-wide association studies identified regions in chromosomes 4A and 6A associated with higher latitudes and freezing tolerance, respectively. Landraces with freezing tolerance may be useful in developing new germplasm as novel sources of greater cold hardiness.http://www.mdpi.com/2073-4395/8/6/95Triticum aestivumlandracesfreezing toleranceelectrolyte leakagegenome-wide association studies |
| spellingShingle | Jinita Sthapit Kandel Meng Huang Zhiwu Zhang Daniel Z. Skinner Deven R. See Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces Agronomy Triticum aestivum landraces freezing tolerance electrolyte leakage genome-wide association studies |
| title | Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces |
| title_full | Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces |
| title_fullStr | Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces |
| title_full_unstemmed | Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces |
| title_short | Genetic Diversity of Clinal Freezing Tolerance Variation in Winter Wheat Landraces |
| title_sort | genetic diversity of clinal freezing tolerance variation in winter wheat landraces |
| topic | Triticum aestivum landraces freezing tolerance electrolyte leakage genome-wide association studies |
| url | http://www.mdpi.com/2073-4395/8/6/95 |
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