硼对芝麻解剖结构的影响

EFFECTS OF BORON ON THE ANATOMICAL STRUCTURE OF SESAME

缺硼使芝麻植株器官受到不同程度的损害。通过电子显微镜观察,叶片除表面变形,气孔关闭外,其内部结构也发生很大变化,叶脉小且维管束相对少,叶肉细胞排列紧密,同时叶绿体发育不全,叶绿体数量减少,因而影响光合作用的正常进行。叶柄和茎的维管束导管小且次生化程度低,细胞排列紊乱。此外芝麻叶的线粒体以及花粉粒等也受到了缺硼的影响。

Boron deficiency caused the damages of differient tissues of sesame. The observation of sections with electron microscope showed that sesame leaves not only had deformed surface and deformed and closed stomas. but also had abnormal inner struture due to boron deficiency. These changes include following eharactaristics: firstly, boron deficient sesame eaves had small veins and vascular bundles. Secondly. the leaf cells were tightly arranged and the number of chloroplasts which did not develope well reduced, therefore, the photosynthesis of boron deficient leaves would be negatively affected. Then, petiole and stem deformed, such as their vascular bundles were small and secondary structures were weak. the arrangement of the celis was in disorder. Low boron content also affected the mitoehondria as well as pollen.