| Drought resistance identification of sunflower cultivars at different growth stages |
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| DOI：10.7606/j.issn.1000-7601.2026.01.02 |
| Key Words: sunflower germination stage seedling stage budding stage drought resistance identification |
| Author Name | Affiliation | | ZHU Zirong | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | ZHANG Xinrong | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | WU Jiajun | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | WANG Ping | Crop Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia Hui Autonomous Region 750002, China | | ZHANG Yuxue | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | TAN Meilian | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | WANG Ling | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | WANG Lei | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China | | WANG Wei | Oil Crops Research Institute, Chinese Academy of Agricultural Science, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan, Hubei 430062, China |
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| Abstract: |
| In order to establish a simple, efficient and practical drought\|resistant identification method for sunflowers and to clarify the differences of drought resistance among sunflower varieties (lines) at different growth stages, 19 sunflower varieties (lines) were used as materials. Different PEG-6000 concentrations were used to simulate drought stress at the germination stage, and natural drought treatment was conducted at the seedling stage and the budding stage. Five indexes (germination potential, germination rate, germ length, radicle length, and fresh mass) at the germination stage, six indicators (plant height, stem thickness, leaf area, SPAD value, root\|shoot ratio, and leaf relative water content) at the seedling stage, and six indexes (plant height, stem thickness, leaf area, SPAD value, leaf relative water content, and diameter of sunflower dish) at the budding stage were measured and compared, respectively. The drought resistance at the germination stage and seedling stage was comprehensively evaluated by combining the methods of principal component analysis, cluster analysis, comprehensive subordinate function method, and step\|by\|step analysis, and the drought resistance at the budding stage was evaluated based on the average subordinate function value. The results showed that the relative indexes of germination potential, germination rate, germ length, and fresh mass for all sunflower varieties (lines) decreased with the increase of PEG-6000 concentration at the germination stage, and the overall decrease ranged from 5.57% to 80.11% at different concentrations, while the relative radicle length initially increased 73.50% at low concentrations (12% PEG-6000) and then decreased by 24.66% to 88.19% with increasing concentration. Natural drought stress at the seedling stage inhibited the growth of plant height, stem thickness, and leaf area, and reduced the root\|shoot ratio and leaf relative water content by 25.24%, 21.57%, 43.79%, 12.00%, and 24.53%, respectively. However, the SPAD value increased by 21.88% compared with the control. The suitable PEG-6000 concentration and the key observation indexes (relative germination rate, relative germ length, and relative radicle length) for drought\|resistance identification of sunflower during the germination stage were determined, as well as the key indexes (relative plant height, relative stem thickness, relative leaf area, and relative root\|shoot ratio) for drought\|resistance identification under natural drought conditions at the seedling stage, and the drought\|resistance identification method of sunflower at the germination stage, seedling stage, and budding stage was established. Using the established method, one strong drought\|resistant material (‘NO.67’) at the germination stage and two strong drought\|resistant varieties (‘NO.35’ and ‘Bakui138’) at the seedling stage were screened from 19 sunflower varieties (lines), and it was found that ‘NO.35’ was drought\|resistant in all three periods by combining with the evaluation of drought resistance at the budding stage. |
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