| Relationship between growth characteristics of above- and under-ground and drought resistance of three rapeseed cultivars under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2019.05.17 |
| Key Words: drought stress Brassica napus L. above-ground and under-ground growth drought resistance |
| Author Name | Affiliation | | GUAN Zhou-bo | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | DONG Yu-hong | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | TIAN Jian-hua | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | CHEN Liang | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Yao-wen | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | ZHAO Xiao-guang | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | WANG Xue-fang | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China | | ZHANG Zhong-xin | Hybrid Rapeseed Research Center of Shaanxi Province, Shaanxi Rapeseed Branch of National Oil Crops Genetic Improvement Center, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to explore the relationship between growth characteristics of above- and under-ground and drought resistance of different drought resistance rapeseed varieties under drought stress, through soil column cultivation experiment under the condition of different water treatment, we studied the relationship of root in different soil layer, above-ground biomass and canopy cover with drought resistance of rapeseed varieties DR1, DR2 and DR3. The results showed that under the condition of water stress and normal water, yield and root biomass of all three varieties achieved significant differences and the drought resistance of three varieties as follows: DR1>DR3>DR2. Under different water treatments, the root weight of rapeseeds was mainly distributed in the soil layer of 0~30 cm, accounting for more than 70% of the total root weight. Under drought stress, the total root weight of the three varieties DR1, DR2 and DR3 were decreased by 22.53%, 24.17% and 24.53%, respectively. But, the root weight of DR1 was the greatest and reached 12.07 g, which showed strong drought resistance, followed by DR3 and DR2. In different soil layers, the root weight of the DR1 was higher than that of DR2 and DR3. In the soil layer below 30 cm, the root weight of the DR1 had the largest percentage of the total root weight. This indicated that the vertical distribution of root considerably impacted the yield under drought resistance. Meanwhile, the direct path coefficients of plant canopy area, total biomass, dry weight of roots, and drought resistance were 0.5861, 0.4514 and 0.5715, respectively, that indicated that except for the root system, reducing the surface evaporation was conducive to crop drought resistance. |
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