UV-C处理抑制马铃薯贮藏期发芽及相关机理研究

为提高马铃薯的食用安全性和贮藏品质,本实验研究了短波紫外线(ultraviolet C,UV-C)处理对马铃薯贮藏过程中发芽品质的影响。采用10 kJ/m2 UV-C对马铃薯进行一次处理(贮藏前),二次处理(贮藏前及中期),并测定发芽率、还原糖、苯丙氨酸解氨酶、多酚、赤霉素、α-茄碱等指标。结果表明,UV-C处理能够有效抑制马铃薯贮藏过程中的发芽,同时延缓赤霉素和α-茄碱的上升。二次处理组贮藏至90 d时,薯皮和肉质部分的α-茄碱含量仅为对照组的71.09%、65.75%;105 d时发芽率为68.78%,还原糖含量为0.40%,失重率为4.71%,贮藏品质均优于对照组和一次处理组。综上所述,当处理剂量和方式适宜时,UV-C可在马铃薯发芽控制及品质保持方面获得良好效果,其中二次处理更具优势。

Study on UV-C Treatment Inhibits Germination and Related Mechanism of Potato during Storage

In order to improve the safety and storage quality of potatoes,the objective of this study was to investigate the effect of ultraviolet C( UV- C) treatment on sprouting suppression and quality of potato during storage.Potatoes were treated with 10 kJ /m2 UV- C before storage or both before and medium storage ( single - phase UV- C treatment,dual - phase UV- C treatment) and the germination rate,weight loss,reducing sugar,total phenols content,phenylalnine ammonia lyase ( PAL) activity,gibberellins( GA3 ) and α-solanine content were measured.The results indicated that UV-C treatment could suppress potato sprouting,restrain the growth of GA3 and α-solanine effectively.Furthermore,dual-phase UV-C treatment had a better effect compared with the control and single-phase UV-C treatment.When stored for 90 days,α- solanine content in the skin and flesh of dual-phase UV-C treated potatoes were only 71.09%,65.75% of the control respectively.At 105 d of storage,the germination rate of dual-phase UV-C treatment was 68.78%,the content of reducing sugar was 0.40% and the weight loss rate was 4.71%.In summary,when the dosage and mode of treatment are suitable,UV - C can obtain good effects in potato germination control and quality maintenance,the dual- phase UV- C treatment is more advantageous and has potential for industrial application in future.