title: Anthocyanin content and the activities of polyphenol oxidase, peroxidase and phenylalanine ammonia-lyase in lettuce cultivars.
abstract: Anthocyanin content and the activities of polyphenol oxidase (PPO), peroxidase (POD) and phenylalanine ammonia-lyase (PAL) and their relationships were determined in the leaves of six lettuce (Lactuca sativa L.) cultivars, exposed for 6 weeks to alternating three different day/night temperatures. Anthocyanin content was found to be highest at 20/13°C, followed by 25/20°C and 30/25°C, showing accumulation of anthocyanin at low temperatures. Activities of PPO and PAL were also found to be highest at low day/night temperatures, whereas the POD activity was decreased at low day/night temperatures. The most significant positive correlation existed between anthocyanin content and PPO activity (r² = 0.71). The results suggest that various day/night temperature regimes affect anthocyanin content and the activities of PPO, POD and PAL in lettuce.
authors: EFARINET Co. Ltd, BI Center, Chosun University, #375 Seosuk-Dong, Dong-Gu, Gwangju-City, Gwangju 501-759, South Korea. chonsu4100@yahoo.co.kr
authors: Sang-Uk
authors: SU
authors: Chon
authors: Hee-Ock
authors: HO
authors: Boo
authors: Buk-Gu
authors: BG
authors: Heo
authors: Shela
authors: S
authors: Gorinstein
mesh_terms: D000872:Anthocyanins / Q000378:metabolism*; D004156:Catechol Oxidase / Q000378:metabolism*; D018545:Lactuca / Q000201:enzymology / Q000378:metabolism*; D009195:Peroxidase / Q000378:metabolism*; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism*; D018515:Plant Leaves / Q000201:enzymology / Q000378:metabolism; D013045:Species Specificity; D013696:Temperature
chemical_list: D000872:Anthocyanins; D004156:Catechol Oxidase; D009195:Peroxidase; D010650:Phenylalanine Ammonia-Lyase