烤煙葉片成熟與衰老生理特性研究

Studies on physiological traits of ripeness and senescence in flue- cured tobacco leaves

摘要: 通過對(duì)煙葉成熟與衰老密切相關(guān)的膜脂過氧化系統(tǒng)研究發(fā)現(xiàn), 在煙葉成熟與衰老過程中, 葉綠素和類胡蘿卜素含量持續(xù)降低, 前者降解速率較快, 打頂后SOD 活性先降后升, 下二棚葉適熟后, SOD 活性持續(xù)上升, 其它葉位則呈現(xiàn)下降, POD 活性和Pr 含量逐漸降低, MDA 活性逐漸升高; 在下二棚葉尚熟至適熟時(shí)是膜脂過氧化與抗氧化平衡轉(zhuǎn)折的關(guān)鍵時(shí)期。

Abstract: Cell membrane- lipid peroxidation and endogenous protective enzymes activity in relation to leaf maturity of flue - cured tobacco were studied in this paper. During ripeness and senescence of tobacco leaf,contents of chlorophyll and carotenoid were continously degraded, with the degradation rate of the former more fast. After topping, SOD activities declined firstly, then went up, in lower leaves sustaining rose after ripeness of lower leaves, at the same time leaves of the other locations were reverse. POD activities and contents of Prdropped off, and MDA contents gradually rose. The key periods when the cell membrane- lipid peroxidation and anti- oxygenation reach balance were from maturation to ripeness.