小麦抗氧化能力对Cs+富集响应的研究

以小麦(Triticum aestivum L.)为材料,在三叶期用不同浓度Cs+(CsCl)进行处理,处理浓度分别为0、0.5、1、5、10和20mmol·L-1,处理7、14、21和28d后分别取样,研究小麦对不同浓度Cs+的富集差异,并探讨Cs+对小麦幼苗抗氧化能力的影响.结果表明,小麦幼苗中Cs+含量与处理浓度...

RESPONSES OF ANTIOXIDANT CAPACITY TO Cs + BIOCONCENTRATION IN WHEAT

The present study aimed to analyze the biological effects induced by bioaccumulation of cesium in Triticum aestivum L.. Seedlings of trefoil stage were treated with 0, 0. 5, 1, 5, 10 and 20mmol·L-1Cs+ in Hoagland solution. Following 7, 14, 21 and 28 days’ exposure, plants were monitored for cesium uptake and parameters involved in the antioxidative defense (including activity of POD and CAT, H2O2 and MDA content). Cesium contents were up to 3.3 fold and 1.7 fold higher in roots compared with leaves and stems (following 28 days’ exposure to 20mmol·L-1 Cs+)， and cesium contents of roots, stems and leaves were up to 51.3 fold、64.2 fold and 43.3 fold higher than exposure to 0.5mmol·L-1 Cs+,respectively. The results showed that the roots was the highest Cs+accumulation organs. Both of transfer factor and bioconcentration factor showed significantly positive relationship with treatment time, which were S/R＞L/R and R/S＞S/S＞L/S entirely. For antioxidative parameters analysis, the activity of POD and CAT increased at first, and then  declined following the increasing of Cs+ concentration and the treatment time; and H2O2 and MDA content continuously increased with the increasing of the Cs+concentration and the treatment time. The results showed that the capability of clearing up the harmful peroxide for POD and CAT were limited, then POD and CAT were inhibited under higher Cs+ concentration, and antioxidant system were impaired in some way.