激光辐照对铁棍山药块茎贮藏保鲜的生理效应初探

Primary Study on Physiological Effect of Laser Irradiation on Storage and Preservation of Yam (Dioscorea opposita Thunb.cv.Tiegun) Tuber

用25mW红外线激光辐照铁棍山药芦头10、15和30min后,其芦头芽萌发受抑,块茎含水量、可溶性总糖和可溶性蛋白含量下降幅度均变小,丙二醛(MDA)和O_(2·)^-含量上升幅度也变小,贮藏前期的超氧化物歧化酶(SOD)活性升高幅度增大,贮藏后期的SOD活性下降幅度变小,以辐照30min的效果为最佳。

Laser irradiation for 10, 15 and 30 min with 25 mW of infrared rays could inhibit yam （Dioscorea opposita） sprouting effectively, and could slow down the ranges of descent of water, soluble total sugar and soluble protein contents and inhibit the increase scopes of malondialdehyde （MDA） and O2^-· contents in tuber. At the same time, the increase scope of superoxide dismutase （SOD） activity was enhanced during the early storage period and the decrease scope of SOD activity was reduced during the later storage period. The effect of irradiation for 30 min was the best among different treatments.