稀土元素镧(La~(3+))对绿豆下胚轴不定根形成的促进作用

稀土元素(La~(3+))在10~(-8)～10~(-5)mol/L浓度范围内,对绿豆下胚轴切段不定根形成(ARF)有促进作用。10~(-5)mol/LLa3~+与10~(-4)mol/LIBA混合处理时的生根数比用IBA处理的增加20％,即表现出协同效应,La~(3+)在不定根形成中的0～24h内处理时促进作用较大。这说明在ARF的诱导期和起始早期外施适当浓度的La~(3+)有利于根原基形成,并促进不定根形成。

PROMOTIVE EFFECTS OF La~( 3) ON THE ROOTING OF MUNG BEAN HYPOCOTYL CUTTINGS

The La~(+3) of rare earth elements at concentrations of 10~(-8)～10~(-5)mol/L increase adventitious root formation of mung bean hypocotyl cuttings. The root number of combined treatment of 10~(-5)mol/L with 10~(-4)mol/L IBA was 20％ much than the number of 10~(-4)mol/L IBA, indicating they act synergistically in the formation of adventitious root. When La~(+3) is applied on 0～24h after cuttings excision, significant production of adventitious roots are observed. This indecates that application of La~(+3) at optimal c6ncentration at inductive phase and early initiative phase promotes the root primordia formation and root growth.