脱落酸对葡萄幼苗镉积累的影响

Effect of Abscisic Acid on Cadmium Accumulation of Grape Seedlings

为降低镉污染条件下葡萄对镉的积累,促进葡萄生长,采用盆栽试验研究镉污染(5 mg/kg)条件下喷施脱落酸对葡萄幼苗生长及镉积累的影响。结果表明,葡萄幼苗各部位的生物量和叶片的光合色素含量均随着脱落酸浓度的增加(0、1、5、10、20μmol/L)而先降低后增加。随着脱落酸浓度的增加,葡萄幼苗叶片的POD及CAT活性和土壤pH呈现先增加后降低的趋势,而SOD活性随着脱落酸浓度的增加而增加。另外,喷施脱落酸能使葡萄幼苗各部位镉含量显著低于对照,并随着脱落酸浓度的增加而减少,脱落酸浓度为20μmol/L时,葡萄幼苗的根系和地上部分分别较对照降低了36.54%和74.36%。综上,喷施脱落酸能够降低葡萄对镉的吸收,以20μmol/L脱落酸浓度最佳。

To reduce the cadmium accumulation in grape and promote the grape growth under the cadmium pollution condition,a pot experiment was used to study the effect of spraying abscisic acid on the growth and cadmium accumulation of grape seedlings under cadmium pollution(5 mg/kg).The results showed that the biomass of each part of the grape seedlings and the photosynthetic pigment content in leaves all decreased first and then increased with the increase of the spraying concentration of abscisic acid(0,1,5,10,and 20μmol/L).Compared with those of control(0μmol/L),with the increase of abscisic acid concentration,the POD and CAT activities of grape seedling leaves and the soil pH value increased first and then decreased,while SOD activity increased with the increase of abscisic acid concentration.In addition,spraying abscisic acid could make the cadmium content of each part of grape seedlings significantly lower than that of the control,and decrease with the increase of abscisic acid concentration.When the concentration of spraying abscisic acid was 20μmol/L,the cadmium content of the roots and above-ground parts of grape seedlings decreased by 36.54%and 74.36%respectively compared with that of control.In summary,spraying abscisic acid could inhibit the cadmium absorption of grape,and the abscisic acid concentration of 20μmol/L is the best.