云烟85不同成熟度叶片组织结构的变化

Change of Tissue Structure in Different Maturity of Yunyan 85

为弄清烤烟不同成熟度烟叶主要组织学指标的变化,采用石蜡切片制片、电动显微镜进行组织结构观察的方法,对云烟85下、中、上3个部位烟叶不同成熟度的组织结构变化进行研究。结果表明:随着成熟度的提高,下、中、上3个部位的烟叶身份逐渐变薄;叶片、上下表皮和栅栏组织的厚度呈逐渐降低的趋势,海绵组织厚度则呈逐渐升高的趋势;栅栏组织厚/海绵组织厚(组织比)和栅栏组织厚/叶厚呈逐渐下降的趋势,海绵组织厚/叶厚则呈逐渐上升的趋势。

In order to study the tissue of different position leaves from lower, middle and upper stalk positions of flue-cured tobacco of Yunyan 85, paraffin sections and electric microscope were used to clarify the changes in the tobacco leaf histological index n different maturity,The results showed that the identity of tobacco gradually thinning, the thickness of leaf, the epicuticle thickness, the lower epidermis thickness, the thickness ratio of palisade to spongy tissue（S/P）, the thickness ratio of palisade to the thickness of leaf continuously reduced, the thickness of spongy tissues, the thickness ratio of spongy to the thickness of leaf increased gradually.