酸铝对荞麦根系形态和体内抗氧化系统的影响

以荞麦(Fagopyrum esculentumMoench.)为试验材料,设置了不同铝浓度和pH(铝浓度分别为0,50,100,150,200 mg/L,pH 3,4,5)的培养条件,研究了荞麦的根系形态和体内抗氧化系统的变化。结果表明:在荞麦根系方面,相同铝浓度处理时,荞麦的根总长、根表面积、根平均直径、根体积随着酸性的增强而减小;相同pH时,它们随着铝浓度的升高先增加后减小,在50和100 mg/L时达到最大。在荞麦抗氧化系统方面,在相同铝浓度处理时,随着酸性的增强,荞麦体内的MDA和Pro含量逐渐增加,POD活性则逐渐降低;而CAT活性在0,50,100 mg/L时随着pH的升高而降低,在150和200 mg/L,pH为4时CAT活性最大。相同pH时,随着铝浓度的升高,MDA和Pro含量先降低后增加,在50 mg/L时达到最低,POD先升高后降低;CAT活性先减少后增加再减少,在100 mg/L或150 mg/L时达到最大值。

Effect of Acid-Al on Root Morphology and Antioxidant System of Buckwheat

The root morphology and antioxidant system of buckwheat were studied with different solutions containing different concentrations of Al and pH(concentrations of Al~(3 ): 0,50,100,150,200 mg/L;pH: 3,4,5).The results showed as follows: root length,root surface area,root average diameter and root volume increased with solution acidity increment under the same aluminum concentration,and rose firstly then decreased with aluminum adding under the same pH with the greatest value at 50 or 100 mg/L of Al~(3 ).For buckwheat leaves,content of MDA(malonaldehyde) and Pro(proline) increased with the lowest value at 50 mg/L of Al~(3 )and POD(peroxidase) activity decreased with acidity rise at the same aluminum concentration;content of MDA and Pro decreased firstly then rose and POD(peroxidase) activity rose firstly then decreased with aluminum adding under the same pH.