通过旱棚盆栽试验，以4个抗旱性不同的白菜型冬油菜品种陇油6号、陇油7号、天油2号、天油4号为材料，用人工控制浇水的方法模拟干旱环境，测定干旱胁迫对其生理生化指标、主要农艺性状的影响。结果表明，随着干旱胁迫时间的延长，4个油菜品种的幼苗叶片叶绿素质量浓度呈现先增加后降低的趋势，相对电导率增大，根系的主根长、侧根数、根系干重、根冠比上升，根系活力下降。干旱胁迫后，抗旱性强的冬油菜品种陇油7号主根长，侧根数多，根干重较重，根冠比大，根系活力稳定；弱抗旱冬油菜品种天油2号主根较短，侧根数少，根干重轻，根冠比小，根系活力变化幅度较大；中抗旱冬油菜品种陇油6号、天油4号各指标居于陇油7号和天油2号之间。

Through a pot experiment, 4 Brassica rapa cultivars, Lonyou 6, Longyou 7, Tianyou 2 and Tianyou 4, with different drought resistance, were used as materials to measure the effects of drought stress on the main agronomic characters and physiological and biochemical indexes under the condition of simulated dry environment with artificial control of water. The results show that with the prolongation of the drought stress time the seedling leaf chlorophyll concentration of 4 Brassica rapa cultivars had a trend of increasing first and then decreasing, while relative electric conductivity increased, the taproot length, lateral root number, root dry weight and root cap ratio rose, and root activity decreased. After drought stress, Longan 7, with strong drought resistance, possessed long main root, more lateral roots, heavier root dry weight, larger root crown and stable root viability. Tianyou 2, with weak drought resistance, possessed shorter main root, less lateral roots , lighter root dry weight, smaller root crown, and the root activity varied greatly. The corresponding indexes of Lonyou 6 and Tianyou 4 were between Longyou 7 and Tianyou 2 .

S565.4

甘肃农业大学省级大学生创新创业训练计划项目(201610733008)。