| Characterization and assessment of drought resistance in tigernut germplasm resources at seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2022.06.02 |
| Key Words: Cyperus esculeutus germplasm assessment seedling stage drought resistance membership function |
| Author Name | Affiliation | | WANG Yaru | School of Life Science, Jilin Normal University, Siping，Jilin 136000, China
Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | YANG Xiangdong | Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | ZHAO Handong | Changchun Agricultural Expo Garden, Changchun, Jilin 130000, China | | NIU Lu | Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | ZHANG Yuanyu | Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | YANG Chunming | Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China | | REN Wei | Agricultural Biotechnology Institute, Jilin Academy of Agricultural Sciences, Changchun, Jilin 130033, China |
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| Abstract: |
| Tigernut (Cyperus esculeutus L.) is a multipurpose cultivated crop with high eco\|economic value. Characterization and assessment of drought resistance in tigernut germplasm resources can greatly facilitate the development of varieties adapted to the arid and semi\|arid sandy land widely distributed in China. In the present study, a total of 39 Tigernut accessions were tested for 17 phenotypical and physiological traits under the treatment of normal irrigation and drought stress in indoor pot\|planting experiment. Comprehensive assessment of drought resistance at seedling stage for these accessions was carried out by using correlation, principal component, membership function, and cluster analysis. The results showed that the effects of drought were significant on the width and thickness of leaf and root length (P＜0.05), and extremely significant on plant height, tiller number, dry weight of root and leaf, and total dry weight of plants (P＜0.01). The coefficient of variation among different germplasms ranged from 0.148 to 0.584. The results of principal component analysis using 17 phenotypical and physiological variables indicated that the first 5 principal components accounted for 74.174% of the total variation among these accessions. Leaf width, leaf yellowing rate, root length, fresh and dry weight, and crown root ratio were suitable as comprehensive criteria for evaluating drought resistance of Tigernut. Cluster analysis produced four major clusters based on their resistance to drought stress, with cluster I containing 2 accessions, cluster Ⅱ containing 10 accessions, cluster Ⅲ and cluster Ⅳ containing 16 and 11 accessions, respectively. Comprehensive evaluation value was an appropriate index for assessing drought resistance of Tigernut accessions. Based on the results of comprehensive assessment of drought resistance, 3 Tigernut accessions (JYD-39, JYD-34 and JYD-28) were identified as the germplasm with higher resistance to drought stress at seedling stage. |
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