摘要
烤烟叶片在不同发育阶段，其内源ＳＯＤ及ＣＡＴ，活性和膜脂过氧化作用和细胞膜透性表现出不同的变化速度，从未熟经欠熟到适熟阶段，ＳＯＤ和ＣＡＴ活性下降缓慢，膜脂过氧化作用及细胞膜透性提高幅度较小；在适熟期之后，ＳＯＤ和ＣＡＴ活性急剧下降，膜脂过氧化水平和细胞膜透性急剧提高。表明烟叶的成熟衰老与体内活性氧代谢密切相关，适熟期是叶片由功能期转向衰老的关键时期。在烟叶成熟过程中，脂肪酸含量发生明显变化。随着成熟度的提高，月桂酸含量增加，棕榈油酸、油酸和二十碳烯酸含量下降，而十三烷酸、十四烷酸、棕榈酸、硬脂酸和亚油酸的含量在适熟期最高。
During maturing of Tobacco leaf, the activities of superoxide dismutase (SOD) and catalase (CAT) decreased and the level of lipid peroxidation and the permeability of cell membrane increased at various rates in different stages of development. From immaturity to proper maturity stage, those changes in activities were quite slow. Thereafter, those changes were accelerated markedly, the results indicated proper maturity stage was key period for tobacco leaf turning to senescent, the maturity and senscence of tobacco leaf were related to the metablic disorder of active oxygen. In addition, the contents of fatty acids in tobacco leaf changed obviously during maturing. With the development of leaf, lauric acid increased, palmitoleic acid, oleic acid and eicosenoic acid decreased, but many fatty acids, such as tridecanoic acid, myristic acid,palmitic acid, stearic acid and linoleic acid, reached their maximum contents at proper maturity stage.
出处
《烟草科技》
EI
CAS
1996年第3期32-34,共3页
Tobacco Science & Technology
关键词
烟草
叶片
成熟
膜脂过氧化
脂肪酸
Tobacco leaf
Maturity
Lipid peroxidation
Fatty acid
