用工作波长632.8nm、功率为2.5mW的He-Ne激光器辐照铁棍山药，30min后，其芦头芽萌发受抑，山药茎含水量、可溶性总糖和可溶性蛋白含量分别从70.2039%下降到66.61544%、从72.21325mg·g-1下降到25.87888mg·g-1、从508.5394μg·g-1下降到258.4231μg·g-1，丙二醛（MDA）和超氧阴离子含量分别从0.62mmol·g-1变为8.033122mmol·g-1、从32.99713μg·g-1变为35.53642μg·g-1，贮藏前期的超氧化物歧化酶（SOD）活性从494.864U·g-1变为1105.85U·g-1，贮藏后期的SOD活性从1105.85U·g-1变为959.167U·g-1。

The Lo bud germination inhibition of Tiegun dioscorea opposita thunb occurred, the yam stem water content, total soluble sugar and soluble protein content respectively declined from 70.2039% to 66.61544%, from 72.21325mg·g-1 to 25.87888mg·g-1 and from 508.5394μg·g-1 to 258.4231μg·g-1, and MDA and O2 contents respectively increased from 0.62mmol·g-1 to 8.033122mmol·g-1 and from 32.99713μg·g-1 to 35.53642μg·g-1 after it was irradiated by 2.5mW He-Ne laser for 30min. After the laser irradiation, the superoxide dismutase (SOD) activity of Tiegun dioscorea opposita thunb increased from 494.864U·g-1 to 1105.85U·g-1 in the initial period of its storage and then declined from 1105.85U·g-1 to 959.167U·g-1.