论文部分内容阅读
采用盆栽的方法,以6个糜子品种(农-021;农-034;农-092;品-011;品-029;品-076)作为试验材料,研究了干旱胁迫下不同品种糜子根系的形态学与生理学特征。结果表明:干旱胁迫下糜子的株高、叶面积、地上重、根重、总根长、根活力及根系SOD活性均明显降低,不同品种间的变化趋势相似,但变化幅度明显不同。中度干旱胁迫下,上述指标最小的下降幅度分别为13.39%、18.33%、8.11%、9.99%、20.92%、10.18%、32.83%;而最大的下降幅度分别为22.67%、38.22%、24.15%、28.87%、41.07%、28.89%、44.97%。同一含水量条件下不同供试品种间根系的形态与生理学特征及同一糜子品种在不同供水条件下的根系形态与生理学特征均存在着明显的差异,表明这两种性状的差异是由基因型和环境因素共同决定的。根重、总根长、根活力、Pro含量及根系SOD活性变化在材料间存在显著差异,在一定程度上反映了糜子品种的抗旱性强弱,可作为糜子苗期鉴定抗逆性强弱筛选的生理指标。在供试的6个品种中,农-021对干旱环境的适应性最强。
Using the method of pot experiment, the morphology of the roots of different varieties of millet under drought stress was studied with 6 varieties of millet (Agro-021; Agro-034; Agro-092; Agro-011; Learning and physiology characteristics. The results showed that the plant height, leaf area, above ground weight, root weight, total root length, root vigor and root activity of the three cultivars decreased significantly under drought stress. The trend of variation among different cultivars was similar, but the variation range was obviously different. Under the moderate drought stress, the minimum decrease rates of the above indexes are respectively 13.39%, 18.33%, 8.11%, 9.99%, 20.92%, 10.18% and 32.83%, while the largest decreases are 22.67%, 38.22% and 24.15% , 28.87%, 41.07%, 28.89%, 44.97%. Under the same water content, the morphological and physiological characteristics of root systems of different tested cultivars and the root morphological and physiological characteristics of the same cultivars under different water supply conditions all showed significant differences, indicating that the difference of these two traits was determined by genotype and Environmental factors jointly determine. Root weight, total root length, root vigor, Pro content and SOD activity in roots were significantly different among the materials, which could reflect the drought resistance of the cultivars to a certain extent. Physiological indicators. Among the six cultivars tested, Nong-021 had the strongest adaptability to arid environment.