摘要
烟叶采收晾制后，体内硝酸还原酶活动剧烈下降，晾制后４ｄ，叶肉内该酶活性即下降至０，晾制后两周主脉内此酶活性下降至０．且两种电子供体间无显著差异．烟叶体外硝酸还原酶活动晾制开始时很低，晾制３周后增加．整个晾制过程中叶肉、主脉硝酸盐含量均无显著变化．晾制后两周主脉亚硝酸盐含量很低，但是晾制后３周开始逐渐增加，叶肉亚硝酸盐在整个晾制过程中无变化．晾制后３周，主脉亚硝酸盐含量增加，与体外硝酸还原酶活动相关，这可能是微生物的酶起作用．
In vivo nitrate reductas activity(NRA) decreased rapidly after harvesting After 4 days of air curing, NRA was near zero and no signifcant difference was observed between different electron donors In vitro NRA was initially low,but increased after 3 weeks Nitrate change was not significant in both lamina and midrib through air curing Midrib nitrite was low during the first 2 weeks of curing, but increased after 3 weeks of curing NRA and nitrite increase in midrib of after 3 weeks was positively correlated and this suggests that not the plant, but the microbial NRA may responsible for nitrite increase during air-curing tabacco
出处
《云南农业大学学报》
CAS
CSCD
1997年第3期183-187,共5页
Journal of Yunnan Agricultural University
关键词
硝酸还原酶活性
晾制
硝酸盐
白肋烟
烟草
Nitrate reductase activity(NRA)
Air-curing
Nitrate
Nitrite
Microbial
