香料烟叶片在成熟过程中的解剖学研究

An Anatomical Study of the Leaf of Oriental Tabacco during the Mature Process

对香料烟叶片在成熟过程中的解剖学观察表明,腺毛在适熟时腺头最大,分泌物最多。随着烟叶成熟度的提高,叶肉细胞的原生质逐渐向细胞边缘凝聚,最后细胞中央成为空腔;细胞核逐渐变小,到过熟时几乎全部消失;细胞中糖颗粒的含量逐步减少。随着叶位的升高,叶厚及栅栏组织、海绵组织的厚度均成指数曲线下降,叶肉细胞在成熟过程中的结构变化速度逐渐减慢,叶表皮的气孔密度及叶肉细胞中糖颗粒的含量逐步增加。栽培密度大(11000株/亩),植株长势弱,叶肉细胞原生质稀薄,叶片极易表现出过熟迹象;密度小(5400株/亩),植株长势旺,叶肉细胞原生质很浓,叶片不易成熟;密度适中(6600株/亩),植株长势正常,叶片也能正常成熟。

The anatomical structure of leaf of Oriental Tobacco was investiga-ted by tissue sectionary;the result was as follows:Glandular hair of matureleaf secreted largely and the head was biggest.During mature process,theplasma of mesophyll cell concentrated gradually near the cell wall and at lastthe cell centre got empty;the cell nucleus got smaller and almost disapperedin time of leaf overripe;the granular sugar content of cell was also gettingsmaller.As the stalk position rose,all the thickness of leaf,palisade paren-chyma and sponge parenchyma appeared in a form of concave curve.Duringmature process,the mesophyll cell's structure change got slower,the densityof epidermis stoma and the granular sugar content of cell increased.The tab-acco grew weakly,plasma of mesophyll dell became less and the leaf appearedoverripe easily in big cultivated density(11000 plant/mu);cultured in smalldensity(5400 plant/mu),the tabacco grew luxuriantly,plasma of mesophyllcell was thick,the leaf was not easy to mature;in proper cultivated density(6600 plant/mu),the tabacco grew normally,the leaf could mature ontime.