不同光强对烤烟质体色素及其降解产物的影响

Effects of Light Intensity on Plastid Pigment and Its Degraded Products in Flue-cured Tobacco

为探讨光照强度对烤烟品质的影响,采用田间试验方法,以自然光照(透光率100%)为对照(CK),研究了不同遮阴处理(透光率分别为55%,70%,85%)对烤烟质体色素及其降解产物的影响。结果表明,100%自然光强(CK)下各部位烤后烟叶中叶绿素和类胡萝卜素含量均最低;随着光照强度的降低,中、上部烤后烟叶叶绿素含量呈先增加后降低的趋势,下部叶逐渐增加;各部位类胡萝卜素含量呈先增加后降低趋势。CK类胡萝卜素降解产物总量及新植二烯含量均高于遮荫处理,遮荫处理上、中、下部位的新植二烯含量平均值较CK分别降低13.59%,19.99%,5.66%,类胡萝卜素降解产物总量平均值较CK分别降低6.70%,8.08%,2.83%。由此可见,遮荫处理增加烟株各部位烤后烟叶中叶绿素、类胡萝卜素含量,降低新植二烯含量及类胡萝卜素降解产物总量。

In the paper,a field experiment was conducted to study the effects of different light intensities（55%,70%,5% and 100% of full sunlight）on the plastid pigment and its degraded products in flue-cured tobacco.The results showed that the contents of chlorophyll and carotene in the flue-cured tobacco leaves at different positions were the lowest in CK（100% light intensity）.With the decrease of light intensity,the chlorophyll content of leaves at upper and middle positions increased first,and then decreased,but increased by degrees in lower leaves,while the carotene content in leaves of all positions increased first,and decreased subsequently.The degraded products of carotene and the neophytadiene were all higher in CK than in shading treatments.The average content of neophytadiene in upper,middle and lower leaves for the three shading treatments was 13.59%,19.99% and 5.66% lower than the CK,respectively,while the average content of degraded carotene products decreased 6.70%,8.08% and 83% respectively.The results indicated that shading treatment increased the contents of chlorophyll and carotene in every position of flue-cured tobacco leaves,while decreased the contents of degraded carotene products and the neophytediene.