Effects of Artificial Aging on Physiological Characteristics of Rice Seeds with Different Dormancy Characteristics

摘要

In this study,two indica varieties with different dormancy characteristics[4K58(II-32B dormant),4K59(II-32B)]and their F 2 seeds(C178,C179)obtained through hybridization with sterile line(II-32A)were used as materials.Different aged seeds(0,3,6 and 9 d)of these four varieties were acquired by artificial accelerated aging method.Effects of artificial aging on malondialdehyde(MDA)content and catalase(CAT),ascorbate peroxidase(APX),peroxidase(POD)and superoxide dismutase(SOD)activity were investigated.The results showed that with the prolongation of aging time,MDA contents of these four rice varieties increased significantly,while the activity of antioxidant enzymes decreased dramatically.Besides,MDA contents and SOD,CAT and APX activity of the two inbred lines were significantly lower than those of the hybrid varieties.In addition,the activity of antioxidant enzymes in 4K58 and C178 was significantly lower than that in 4K59 and C179,respectively.This study indicated that artificial aging treatment significantly inhibited the activity of antioxidant system in seeds,improved membrane lipid peroxidation degree,and thus aggravated the deterioration of seeds.In addition,it also suggested that rice seeds with dormant property were more intolerant to storage.