硼对芝麻解剖结构的影响

EFFECTS OF BORON ON THE ANATOMICAL STRUCTURE OF SESAME

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.