摘要
短日照处理引起Ｌｅｍｎａｍｉｎｏｒ的两个日长反应不同的品系，以及Ｌｅｍｎａｐａｕｃｉｃｏｓｔａｔａ６７４６中硝酸还原酶的体外活性下降。在Ｌ．ｍｉｎｏｒＧｌ和Ｌ，ｐａｕｃｉｃｏｓｔａｌａ６７４６两个短日品系中，短日照导致过氧化物酶活性和抗坏血酸含量水平增高。其抗坏血酸含量水平与过氧化物酶的活性水平具有平行增长关系。对日长不敏感的品系Ｌ．ｍｉｎｏｒＧ＿２中过氧化物酶活性在短日下呈现强烈起伏和随后的衰减。其抗坏血酸含量水平在同期表现连续下降。对两个Ｌ．ｍｉ－ｎｏｒ品系中过氧化物酶同工酶的比较表明，在不敏感品系中缺乏迁移最快的阴离子酶带，而同一酶带存在于短日照品系中，并呈现明显的被诱导变化。
Short-day(SD) treatments caused a decrease in the in vitro activities of the nitratereductase in two strains of Lemna minor that differ in photoperiodic behaviours and in L.paucicostata 6746. SD treatment resuIted in a steady increase in peroxidase activity andascorbic acid content in two strains of L. minor Gl and L. paucicostata 6746 with short-dayresponses. The content of ascorbic acid increases in parallel to the rise in the activity level ofperoxidase. Under SD, the photoperiodically insensitive strain L. minor G2 exhibited intensefluctuations and a subsequent decline in peroxidase activity; the content of ascorbic acid inthis strain showed a continuous decrease during the same period. Comparison of peroxidaseisoenzyme between the two L. minor strains indicated that the fast-moving anionic band wasabsent in the insensitive strain. The same enzyme band in the strain with a short-dav re-sponse displayed an induced decrease in activity
出处
《水生生物学报》
CAS
CSCD
北大核心
1994年第2期128-135,共8页
Acta Hydrobiologica Sinica
关键词
浮萍属
硝酸还原酶
过氧化物酶
Lemna,Nitrate reductase,Peroxidase, Ascorbic acid
