| Comprehensive evaluation of drought resistance of seventeen confectionary sunflower hybrid at seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2021.03.03 |
| Key Words: confectionary sunflower drought stress root morphology biomass drought resistance identification |
| Author Name | Affiliation | | SONG Dianxiu | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | CUI Liangji | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | WANG Dexing | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | LIU Jingang | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | SUN Enyu | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | YI Bing | Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China |
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| Abstract: |
| Studying the effect of drought stress on sunflower root morphology and biomass and identifying drought resistance sunflower are of great significance for drought resistance breeding and water\|saving cultivation of sunflower. In this study, 17 confectionary sunflower hybrids were used, the method of 1/2 Hoagland nutrient solution hydroponic was used to simulate drought stress with PEG-6000, and the response of root morphology and biomass at seedling stage to drought stress was analyzed. A comprehensive evaluation of the drought resistance of these hybrids was conducted. The results showed that the root morphology of confectionary sunflower at seedling stage was more sensitive to drought stress than the biomass. The sensitivity of root morphology to drought stress was ranked in the order of root volume＞average root diameter＞root tips number＞total root length＞root surface area. The sensitivity of biomass to drought stress in oder was shoot dry weight＞root\|to\|shoot ratio＞plant dry weight＞root dry weight. The comprehensive drought resistance capacity D value was highly significant positively correlated with total root length, root dry weight, plant dry weight, root tips number， and root surface area, with the correlation coefficients being 0.81, 0.70, 0.66, 0.63， and 0.60, respectively. The shoot dry weight was significantly positively correlated with the comprehensive drought resistance capacity D values, with the correlation coefficient being 0.58. The Con15, Con03, Con16 and Con14 were confectionary sunflowers with strong comprehensive drought resistance at seedling stage. |
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