铝对荞麦生理影响的研究

Effects of Aluminium on Some Physiological Charactes of Buckwheat

以荞麦(FagopyrumesculentumMoench.)为材料,用不同浓度的铝进行土培,研究了铝对荞麦一些生理特性的影响。结果表明,低浓度的铝(0.6gAl3·+kg-1土)能提高荞麦蛋白质含量、降低其丙二醛(MDA)含量,且体内SOD、POD酶的活性均处于较低水平,对荞麦生长有一定的促进作用;高浓度的铝(1.2gAl3·+kg-1土)则会抑制荞麦的生长,降低蛋白质含量,使MDA含量增加,使荞麦叶片的脂质过氧化加剧,明显不利于荞麦的生长发育。同时,试验证明荞麦可以通过提高体内的SOD、POD酶的活性来缓解铝胁迫。

The present study investigated the effects of alminum（A1） on physiological characteristics of buckwheat （Fagopyrum esculentum Moench ）using soil culture, with different concentrations （0, 0.3, 0.6, 0.9, 1.2 g Al^3＋·kg^-1）. Measurement were carried out by utilization of Al2（SO4）3-18H2O, and the physiological characteristics of buckwheat were investigated at 40th, 55th and 70th day, respectively, while the activities of superoxide dismutase （SOD）, peroxidase （POD）, the contents of malondialdehyde （MDA） and protein of leaf in buckwheat were considered for measurement. The results from this study indicated that suitable aluminium concentration （0.6 g AP^- kg 1） was advantageous to the growth of the buckwheat. Under this aluminium concentration （0.6 gAl^3＋·kg^-1）, the permeability of membrane in the leaf of buckwheat was the lowest and the protein content was the highest compared with the plant under other aluminium concentrations; and the activities of SOD and POD were kept at low levels; while high A1（1.2 gAl^3＋·kg^-1） restrains growth of buckwheat by greatly increasing membrane permeability of the leaf cells, reducing the contents of protein, significantly increasing the activities of SOD and POD, and the buckwheat were die away at 70th day. Meanwhile the results showed that buckwheat could promote SOD and POD activities to resist the aluminum toxicity.