Effects of Shaded Treatment on Density of Central Trichome and Content of Glandular Secretions in Tobacco

Density of trichome and glandular secretions and changes in circumstances of tobacco central leaf under the conditions of the shade and normal light were analyzed by the method of wide field of vision microscope and GC/MS.The results showed that with the increase in transplanting time and different light conditions,the density of trichome decreased as the order of leaf tip,the middle leaf and basal leaf.The density of leaf trichome under shaded treatment is lower than those under normal light conditions,and achieve a significant level of difference.Throughout the process,the density of trichome under the conditions of shaded treatment were lower than those under normal light conditions and up to a very significant difference.The glandular secretions of tobacco leaf were analyzed by the method of GC/MS under different light conditions.The content of the major secretion,leukotrienes glycol duvatriene diol,was significantly lower under shaded treatment than that under the normal light conditions.The light has a significant impact on the development of trichome and excreting of glandular secretion in tobacco leaf.