论文部分内容阅读
以EV1、EV2、EV3、EV4、EV5、EV66个抗旱性不同的油菜品种为试验材料,通过不同浓度PEG-6000渗透溶液模拟干旱胁迫处理,研究油菜幼苗的抗旱指数、根长、苗高和根冠比等性状变化,探索在大田环境条件下的苗期生长特征。结果表明,水分胁迫下EV2的抗旱指数最大,EV6的抗旱指数最小;不同浓度PEG胁迫下,各品种差异显著,EV1、EV2、和EV3的根长、苗高和根冠比较大,而EV5和EV6的表现较差。在大田油菜五叶期时,EV2的冠层覆盖面积最大,与其它品种之间存在极显著性差异;总生物量以EV2、EV3和EV1较大,根系干重以EV2较大,而且三者之间存在显著相关性;与抗旱指数进行通径分析,冠层覆盖面积对抗旱性的直接通径系数最大,达到0.5975。冠层覆盖面积的大小反映了早期活力的强弱,早期活力强,相应的品种抗旱指数高,抗旱性强。
The rape cultivars with different drought resistance of EV1, EV2, EV3, EV4, EV5 and EV66 were used as experimental materials to study the drought resistance index, root length, seedling height and root of rape seedlings by simulating drought stress with different concentrations of PEG-6000 infiltration solution Crown ratio and other traits, to explore the growth characteristics of seedlings under field conditions. The results showed that the drought resistance index of EV2 was the highest under water stress and the drought resistance index of EV6 was the lowest. Under the different concentrations of PEG, there was significant difference among the varieties, and the root length, seedling height and root-crown ratio of EV1, EV2 and EV3 were relatively large, EV6’s performance is poor. At the five-leaf stage of the field, the canopy area of EV2 was the largest with significant difference from other cultivars. The total biomass was larger with EV2, EV3 and EV1, and the root dry weight was larger with EV2, and the three There was a significant correlation between them. With the path analysis of drought resistance index, the direct path coefficient of canopy coverage to drought resistance was the largest, reaching 0.5975. The size of canopy cover reflects the strength of early vigor, early vigor, corresponding drought resistance index of varieties, drought resistance.