摘要
以尾张温州蜜柑(Citrus unshiu Marc.)和哈姆林甜橙(Citrus sinensis Osbeck.)为试材,研究了不同温度预处理对果实呼吸速率、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、过氧化物酶(POD)活性、丙二醛(MDA)含量、果皮相对电导率(REC)和木质素含量的影响。结果表明,20℃预处理 3d的果实,在贮藏至 100 d时,呼吸速率、MDA含量。果皮 REC均为最低。20℃预处理果实在贮藏后期 SOD与 CAT能较好地协同作用清除 O2-·,果实受自由基伤害程度最小,果实衰老得以延缓。温度预处理引起的POD活性的上升可能与提高果皮木质素含量、加速受损伤油胞的迅速愈合有关,而贮藏后期 POD活性的上升可能与果实的衰老有关。
Fruit of Satsuma mandarin (Citrus unshiu Marc.) and Hamlin sweet orange(Citrus sinensis Osbeck. ) were used as material for studying the effects of different temperature pre-treatments on fruit respiratory rate, superoxide dismutase (SOD), catalase(CAT) and peroxidase(POD) activity, malondlaldehyde (MDA) content, relative electrical conductivity (REC) and lignin content of pericarp. Results showed the respiratory rate, MDA content, REC of the fruit pre-treated with 20℃ were the lowest ones throughout the whole storage period. The incresed POD activity caused by temperature pre-treatment may be connected with the increase of pericarp lignin content and flavedo cure, while the increased POD activity in late storage peri- od may be involved in the senescence of citrus fruit. It is suggested that the 20℃ pre-treatment allowed SOD and CAT inter- act better to get rid of O2-, thus lessen the level of free- radical injury and postpone fruit senescence.
出处
《果树学报》
CAS
CSCD
北大核心
2001年第5期267-271,共5页
Journal of Fruit Science