成熟期光强对烤烟理化特性和致香成分含量的影响

2004、2005年在四川凉山烟科所通过盆栽试验,在烤烟成熟期营造不同的光照强度,研究了成熟期光强不同对烤烟品质的影响。结果表明:成熟期随着光照强度的降低,叶片厚度降低,栅栏组织/海绵组织的比值降低,烤后烟叶单叶重、厚度、叶质重降低,叶片含梗率增加,总糖和还原糖含量降低,总氮和烟碱含量升高,钾和氯含量增加,叶黄素、β-胡萝卜素和类胡萝卜素总量增加,中性致香成分含量呈增加趋势,增加到一定程度开始降低。

Effects of different light intensity during tobacco ripe stages on the quality of flue-cured tobacco

The two-year pot-culture experiments for cultivars were Yunyan85 were conducted during 2004 and 2005.Each pot was filled with 20 kg air dried soil.The planting dates were May 20 and May 13 in 2004 and 2005 respectively.Shading-controlled experiments were conducted 7d after topping with shade-cloth to achieve three different irradiances of 100%,50% and 20% of full sunlight in 2004,five different irradiances of 100%,60%,40%,20% and 10% of full sunlight in 2005.The shade environment was created by using white button fabric with 5 meters long and 3 meters wide,hung horizontally 3 meters above the bottom of the pots.In ording to insure shading treatment effective in the early morning and late afternoon,each sides of the tobacco canopy were also covered by the same fabric.The results indicated that.The thickness,rate of palisade tissue and spongy tissue of tobacco leaves at the ripe stage reduced when light intensity decreased.Weaker light intensity decreased the weight and thickness per leaf,weight per unit leaf area,leaf density and sugar content of flue-cured tobacco leaves,and increased content of stem ratio,nicotine,total nitrogen,potassium,chlorine,lutein,carotenoid and aroma constituent.