水分胁迫下持绿型高粱根系形态及其活力研究

在盆栽条件下,研究了开花期和灌浆期干旱胁迫对持绿型高粱B35和普通高粱三尺三根系形态及其活力的影响。结果表明,与对照相比,持绿型高粱B35具有较高的根干重,较大的根冠比、总根长、根表面积、根体积、根尖数、根系还原力和相对吸收表面积,并且在水分胁迫下降幅较小。在干旱条件下,持绿型高粱B35能保持较好的根系形态和具有较高的根系活力,是持绿型高粱抗旱机制之一。

Root morphology and activity of stay green sorghum under water stress

The effects of water stress at flowering and filling stages on root morphology and activity of stay green sorghum B35 and normal sorghum Sanchisan were studied under pot cultivation.Compared with normal sorghum Sanchisan,stay green sorghum B35 showed higher root dry weight,root/shoot,total root length,root surface area,root volume,tips of root,root reducing capacity and relative absorbing surface area.Under water stress,root morphology indexes and reducing capacity of stay green sorghum B35 decreased in smaller extents than did normal sorghum Sanchisan.We suggested that stay green sorghum B35 could maintain good root morphology and high root activity under the condition of water stress,which ensured stay green sorghum being in normal growth and development.