Abstract:

To investigate the regularity of morphology and density of the glandular hairs of different flue-cured tobacco varieties, this paper observed morphological characteristics of glandular hairs of seven kinds of the flue-cured tobacco by scanning electron microscope and optical microscope and made a research on quantity and distribution of glandular hairs. The results showed glandular hairs of the flue-cured tobacco included long trichomes and short ones according to the quantity of stalk cell, which short trichomes developed late with steady quantity and the secretary cells in the head was small with large amounts while long ones was dominate hairs on the surface of leaf. The trichome density on the down surface, which could more reflect the features of glandular hairs, was higher than the up surface for 7 kinds of flue-cured tobacco except ‘Longjiang 911’. Long trichomes which had a greater proportion of the glandular hairs had the biggest influence on the overall density of the trichomes, but the short’s contribution to the aroma of tobacco should not be neglected. The trichomes density between different flue-cured tobacco had certain characteristic, the average sequence of up surface and down surface of trichomes density was ‘Jiyan 7’> ‘Longjiang 915’> ‘Longjiang 851’> ‘K346’> ‘NC89’> ‘Longjiang 911’>‘CF978’.