The growth of seedlings of Townsville sytlo (Stylosanthes humilis H.B.K.) is inhibited by aluminium (Al) ions, their elongation being re-covered with sodium selenate at 1.0 μM. Methyl viologen and hydrogen peroxide, ...The growth of seedlings of Townsville sytlo (Stylosanthes humilis H.B.K.) is inhibited by aluminium (Al) ions, their elongation being re-covered with sodium selenate at 1.0 μM. Methyl viologen and hydrogen peroxide, reactive oxy-gen species (ROS)-generating compounds, also inhibited seedling elongation and again growth was relieved by selenate. Selenate, thus, seemed to be operating as a ROS quencher, since N-acetylcysteine (NAC), an antioxidant com-pound, also stimulated largely the growth of Al-inhibited seedlings. At a higher concentra-tion (0.1 mM), however, selenate inhibited seed-ling growth and elongation was recovered by NAC. Ethylene production by selenate plus NAC-treated seedlings was very higher and thus the gaseous hormone was not responsible for the seedling growth inhibition caused by sele-nate. Hence, it seems that at high levels sele-nate operates as a ROS-generating compound whose effects were counteracted by NAC. It can be deduced that, at low concentration, sele-nates behave as a ROS quencher and at high level as a ROS-promoting species.展开更多
[目的]探索磷对柱花草的影响。[方法]利用盆栽试验,研究了热研2号,热研5号和热研13号3种柱花草牧草在磷水平为0(P0)、0.2(P1)、0.8(P2)、1.6(P3)g P2O5/kg土条件下的生长和养分吸收情况。[结果]结果表明,磷促进了柱花草的生长、植株干...[目的]探索磷对柱花草的影响。[方法]利用盆栽试验,研究了热研2号,热研5号和热研13号3种柱花草牧草在磷水平为0(P0)、0.2(P1)、0.8(P2)、1.6(P3)g P2O5/kg土条件下的生长和养分吸收情况。[结果]结果表明,磷促进了柱花草的生长、植株干物质积累和植株对磷和氮量的吸收。综合考虑各生长指标,选择P2水平,即0.8 g P2O5/kg土作为最佳磷水平。而3种柱花草中,热研二号柱花草相对来讲是最优的品种。[结论]适量的磷对柱花草的生长具有一定的促进作用。展开更多
文摘The growth of seedlings of Townsville sytlo (Stylosanthes humilis H.B.K.) is inhibited by aluminium (Al) ions, their elongation being re-covered with sodium selenate at 1.0 μM. Methyl viologen and hydrogen peroxide, reactive oxy-gen species (ROS)-generating compounds, also inhibited seedling elongation and again growth was relieved by selenate. Selenate, thus, seemed to be operating as a ROS quencher, since N-acetylcysteine (NAC), an antioxidant com-pound, also stimulated largely the growth of Al-inhibited seedlings. At a higher concentra-tion (0.1 mM), however, selenate inhibited seed-ling growth and elongation was recovered by NAC. Ethylene production by selenate plus NAC-treated seedlings was very higher and thus the gaseous hormone was not responsible for the seedling growth inhibition caused by sele-nate. Hence, it seems that at high levels sele-nate operates as a ROS-generating compound whose effects were counteracted by NAC. It can be deduced that, at low concentration, sele-nates behave as a ROS quencher and at high level as a ROS-promoting species.
文摘[目的]探索磷对柱花草的影响。[方法]利用盆栽试验,研究了热研2号,热研5号和热研13号3种柱花草牧草在磷水平为0(P0)、0.2(P1)、0.8(P2)、1.6(P3)g P2O5/kg土条件下的生长和养分吸收情况。[结果]结果表明,磷促进了柱花草的生长、植株干物质积累和植株对磷和氮量的吸收。综合考虑各生长指标,选择P2水平,即0.8 g P2O5/kg土作为最佳磷水平。而3种柱花草中,热研二号柱花草相对来讲是最优的品种。[结论]适量的磷对柱花草的生长具有一定的促进作用。
