| Genetic diversity of spring wheat germplasm resources based on drought resistance in Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2017.06.15 |
| Key Words: spring wheat drought resistance ogronomic trait genetic diversity |
| Author Name | Affiliation | | ZHANG Wei-jun | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | YUAN Han-min | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | WANG Xiao-liang | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | KANG Ling | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | HE Jin-shang | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | CHEN Dong-sheng | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China |
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| Abstract: |
| In order to provide a theoretical basis for wheat breeding against drought, 11 agronomic traits of 91 spring wheat germplasm resources, including wheat varieties cultivars, landraces and introduced varieties, were used to analyze their genetic diversity, the drought index and the clustering study. Results showed that sterile spikelet per spike had the largest coefficients of variance (CV) of 63.5% and 51.5% under the conditions of drought stress and normal irrigation, followed by length from flag leaf pulvinus to spike base with CV of 36.9% and 36.3%, respectively. Correlation analysis of drought tolerance index (DTI) showed that DTI of the yield had significant negative correlations with the plant height, peduncle length and length from flag leaf pulvinus to spike base, respectively. Genetic diversity index (H′) of DTI among different traits had a large range from 0.99 to 2.48, with an average value of 1.73. The false spikelet number had the largest H′ of 2.48. Based on the phenotypic traits, all accessions could be clustered into five groups. Varieties from the fourth group were not sensitive to irrigation and may be suitable for cultivation in dryland. Overall, the genetic basis of Ningxia spring wheat is relatively limited. Therefore, breeders should widely collect and use germplasm resources and proximal species of wheat, broadening the genetic basis in order to lay the foundation for breeding of breakthrough cultivars. |
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