摘要
采用大棚加盖Mylar膜的方法,在大田条件下研究了烤烟不同生育期(旺长期、生理成熟期和工艺成熟期)减弱UV-B辐射(相当于自然环境下强度的39.59%)对不同叶位叶片含水量(LWC)、比叶重(SLW)、光合色素、类黄酮(FV)和丙二醛(MDA)等的影响。结果表明,旺长期减弱UV-B辐射对烟叶LWC影响较小,但可降低中、下部烟叶的SLW,生理成熟期和工艺成熟期减弱UV-B辐射可降低中、上部叶的LWC,但可提高其SLW值。旺长期和生理成熟期减弱UV-B辐射可降低中部叶的叶绿素a(chl a)、b(chl b)含量,工艺成熟期减弱UV-B辐射后中、上部叶的chla、b含量上升。旺长期和生理成熟期减弱UV-B辐射降低MDA含量,FV和类胡萝卜素(car)变化与MDA基本相反。结果说明,旺长期较强的UV-B辐射有利于提高烟叶的SLW,旺长期和生理成熟期较强的UV-B辐射还可促进chl和car的合成,MDA的变化与FV和car有一定的关系。
The effects of reduced UV-B radiation（39.59% of natural intensity）,which was obtained by covering with Mylar plastic membrane,on leaf water content（LWC）,specific leaf weight（SLW）,photosynthetic pigments,flavonoid（FV） and malondialdehyde（MDA） of different leaf positions in tobacco variety K326 were studied in different growing stages,e.g.fast-growing period,physiological maturity period and technological maturity period,with field experiment.The results showed that there was a little influence of reduced UV-B radiation on LWC in fast-growing period,whereas SLW of middle and bottom leaves were decreased.UV-B radiation reduction in physiological maturity period and technological maturity period reduced LWC of middle and upper leaves,but improved SLW.Chlorophyll a and b（chl a,chl b） of middle leaf were decreased by reduced UV-B radiation in fast-growing period and physiological maturity period.However,chl a and chl b of middle and upper leaves were increased by UV-B radiation reduction in technological maturity period.Reduced UV-B radiation in fast-growing period and physiological maturity period decreased MDA content and the changes of FV and caroteniod（car） were substantially opposite to MDA.The results indicated that high UV-B radiation intensity in fast-growing period was in favour of improving SLW of tobacco leaf,and high UV-B radiation in fast-growing period and physiological maturity period was promoting syntheses of chl and car.Change of MDA had a certain relation with FV and car.
出处
《中国农业气象》
CSCD
2011年第4期558-564,575,共8页
Chinese Journal of Agrometeorology
基金
国家烟草专卖局资助课题(110200801034)
关键词
减弱UV-B辐射
烤烟
生育期
生理生化特征
Reduced UV-B radiation
Flue-cured tobacco
Growing stage
Physiological and chemical characteristic
作者简介
简少芬（1984-），女，海南屯昌人，硕士生，主要从事高原气候生态与植物生理学研究。E—mail：jianshaofen@163．com
通讯作者。E—mail：zchen191@vip．sohu．com
