植物激素对油菜植株富集^(133)Cs和^(88)Sr的影响

The effect of phytohormones on the ^(133)Cs and ^(88)Sr accumulation in oilseed rape

通过水培试验,研究外源植物激素(生长素IAA、赤霉素GA、水杨酸SA)对油菜吸收和累积133Cs、88Sr的影响。以西南地区普遍种植的甘蓝型油菜为试验材料,利用火焰原子吸收光谱法对油菜苗进行88Sr和133Cs含量的测定。结果表明:在三种植物激素处理下,油菜地上部和根部的生物量显著高于对照(未加激素),油菜中133Cs和88Sr富集量也增多。油菜对133Cs、88Sr吸收规律总体表现出根部含量>地上部含量,133Cs含量>88Sr含量。三种激素处理下油菜植株对锶铯的总累积量规律为GA>SA>IAA,133Cs和88Sr在油菜体内的富集量随IAA浓度的增加而增大,但随GA、SA浓度的的增加表现出下降的趋势,相比之下,中等水平的GA(500mg/L)和SA(500μmol/L)的施加能显著增加油菜在低水平锶铯(1 mmol/L)胁迫下的生物量、富集量和转移系数。可见,植物激素的添加可强化油菜对133Cs和88Sr污染的修复效果。

The effect of uptake and distribution of ^133Cs and ^88Sr in the common plant-India mustard （Brassica napus L.） by exogenous phytohormones （Gibberelin-A3, GA3. Salicylates, SA, 3-indole acetic acid, IAA） treatments were studied by using hydroponic experiment. The results shown as follows： the biomass of above-ground and that of roots of oilseed rape were obviously higher than that of contrary （non-hormone）, and the accumulation of ^133Cs and ^88Sr increased as well, under the three phytohormones treatments. The distribution sequence of ^133Cs and ^88Sr in oil- seed rape was roots〉above-grounds, and the contents was ^133Cs 〉 ^88Sr. The accumulation ability of phytohormones was GA〉SA〉IAA, the accumulation of ^133Cs or ^88Sr increased with the phytohormone concentration. The treatment of mid-level of Gibberelin-A3 （500 mg/L） and Salicylates acid （500 μmol/L） increased the biomass, enrichment and the translocation factors under the low concentration of ^133Cs and ^88Sr stress （1 mmol/L）. Therefore, the phyto-extraction efficiency was enhanced in oilseed rape by using exogenous phytohormones.