渗透胁迫下高粱幼苗根抗氰呼吸的研究

用呼吸抑制剂和氧肟酸滴定法,在渗透胁迫下测定了两个抗旱性不同的高粱品种三尺三(抗旱性弱)和3197B(抗旱性强)幼苗根中抗氰呼吸的变化。结果表明:正常供水条件下,三尺三根中电子传递以交替途径为主,3197B根中则以细胞色素途径为主。水分胁迫下,三尺三幼苗根中交替途径下降,细胞色素途径上升,转变成以细胞色素途径略占优势,而3197B交替途径运行量增大,细胞色素途径运行量减小,转变成以交替途径为主。

A Study on Cyanide-Resistant Respiration of Sorghum Seedling Roots Under Osmotic Stress

The changes in cyanide resistant respiration of sorghum seedling roots of two different drought resistant cultivars-"San Chi San" (weak drought resistance) and "3197B" (strong drought resistance) under osmotic stress were determined using respiration inhibitor and hydroramic acid titration. The results showed that under normal water supply, electron transport in seedling roots of San Chi San was the alternative pathways in the main, while that in seedling roots of 3197B was mainly cytochrome pathway, and that under water stress, the alternative pathway in seedling roots of San Chi San decreased, but its cytochrome pathway increased, which became dominative, while the situation in 3197B was just opposite, i.e. the alternative pathway increased, and the cytochrome pathway decreased, and the alternative pathway was in the main.