切断深层根对黍子根系及地上部营养生长的影响

Effect of cutting deep root system on the growth of roots and aerial parts in proso millet

采用根管土柱栽培的方法,研究了拔节期和抽穗期切断不同深度(20 cm和40 cm)根系对黍子根系整体及地上部营养生长的影响。结果表明,与不断根相比,在抽穗期和拔节期断掉20 cm或40 cm以下根系,均能导致黍子株高、旗叶叶绿素含量、旗叶SOD与POD活性、单株绿叶面积、总根活力、总根长、总根重及产量明显降低,旗叶M DA含量明显增高。抽穗期断深层根对黍子的影响大于拔节期。但同一生育时期不同深度断根处理间黍子产量差异未达显著水平,表明深层根系(40 cm以下根系)对产量的贡献更大。

The effects of cutting root system in different depth （20 cm and 40 cm） at jointing stage and booting stage on the growth of roots and aerial parts as well as the yield of proso millet were studied with the method of soil column cultivation. The results showed that. （1） As compared with CK （without cutting root）, root cutting could lead to the significant decreases of plant height, chlorophyll content of flag leaf, SOD and POD activity of flag leaf, green leaf area, total root activity, total root length, total root weight and yield, while the MDA content of flag leaf was increased significantly, （2） The yield reduction by root cutting at booting stage was higher than that at jointing stages （3） There was no significant difference of yield between different depth of root cutting （20cm or 40cm） at same growth stage, which indicted that the roots below 40cm were more important for the yield formation of proso millet.