烤烟发育及成熟过程中细胞超微结构的变化

为研究烤烟叶片细胞的发育和成熟规律,2008年在平顶山市郏县堂街乡,定期选取该地区主栽烤烟品种NC89的叶片,利用透射电子显微镜观察叶片生长发育及成熟过程中细胞超微结构的变化。结果表明：烤烟叶片叶龄在1~11 d时,以细胞分裂和细胞数量增加为主；至叶龄21 d时细胞分裂基本停止,细胞体积迅速增大；叶龄31 d时开始进入细胞旺盛的生理功能期；叶龄41 d时已进入旺盛的同化物积累期,叶龄21～41 d是烟叶品质形成的关键时期。欠熟时,细胞仍能进行微弱的同化物积累,随着成熟度的增加,叶绿体和细胞核逐步降解；过熟时淀粉粒开始大量降解。

Changes in cell ultrastructure of flue-cured tobacco,leaf cells during development and maturity process

In order to study the cell development and maturation patterns of flue-cured tobacco,the changes in cell ultrastructure of variety NC 89 during development and maturation process were studied by electron microscope with the samples obtained in Tangjie Township,Jiaxian County,Pingdingshan City in 2008.The results showed that cell division and increment played a major role from 1 to 11 days of leaf age.From the 21st day of leaf age,the cell division stopped,and the cell volume began to increase rapidly.Cells ...