油樟精油对马铃薯发芽的影响

Effect of Cinnamomum longepaniculatum Essential Oil on Potato Bud Germination

马铃薯发芽后易腐烂、产生龙葵素等有毒物质,造成食用安全隐患。试验旨在通过研究油樟精油对发芽期马铃薯生理状态的影响,明确其抑芽效果,探究油樟精油作为天然、安全、绿色抑芽剂的开发潜力。以马铃薯‘V7’为试验材料,设置3个处理,分别为17.66 g/m~3·d油樟精油(H)、1.33 g/m~3·d油樟精油(L)、空白对照(CK)。在室温25℃、避光环境中贮藏28 d,每隔7 d记录薯块发芽率、重量变化,分别测定不同处理薯肉及芽的3个抗氧化酶活性[超氧化物歧化酶(Superoxide dismutase,SOD),过氧化物酶(Peroxidase,POD),过氧化氢酶(Catalase,CAT)]、丙二醛(Malondialdehyde,MDA)含量、可溶性蛋白含量以及薯肉总还原糖含量。结果表明,油樟精油处理组发芽率、失重率减缓升高,薯肉与芽的抗氧化酶活性、可溶性蛋白含量维持在较高水平,薯肉总还原糖含量减缓下降。薯肉MDA含量较低,而芽MDA含量较高。综上,油樟精油可以减缓马铃薯发芽进程、抑制芽的生长,17.66 g/m~3·d油樟精油处理抑芽效果最佳。

Potato is easy to rot after sprouting and produce toxic substances such as solanine, which cause hidden dangers for food safety. This research was designed to study the effect of Cinnamomum longepaniculatum essential oi on the physiological state of potato during germination period, and explore the development and utilization potential of the essential oil as a natural, safe and green germination suppression agent. The potato variety ’V7’ was used as material, and three treatments were set up, i.e. essential oil 17.66 g/m3 · d (H), essential oil 1.33 g/m3 · d (L), and blank control (CK). Potatoes were stored at closed and dark cartons with temperature at 25℃ for 28 d. The germination rate and weight changes were recorded every seven days, and then the activities of three antioxidant enzymes [Superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)], malondialdehyde (MDA) content and soluble protein content in both flesh and bud, and total reducing sugar content only in flesh were measured. The germination rate and weigh loss rate of essential oil treatments increased slowly. The antioxidant enzyme activities, soluble protein content in both flesh and bud remained at a high level, and total reducing sugar content in flesh descended slowly. The MDA content in flesh was lower, but higher in bud. In conclusion, The essential oil from C. longepaniculatum could slow down the germination speed of potato and inhibit the growth of potato bud, and the treatment of 17.66 g/m3 · d has the best effect on bud inhibition.