16.ブタクサ花粉の膜構造(第5回アレルゲン研究会)

抄録

In this paper, the stratigraphical structure of the pollen wall of common ragweed (Ambrosia artemisifolia var. elatior) is analyzed from ultra thin section. On the surface of pollen wall, the presence of a micropore and electron dense peripheral material was seen with an electron microscope. The diameter of the micropore is about 0.5μ and their numbers are about 240. The character of micropores is an important criterion to the resistance of pollen grains to desiccation. The degree of dehydration may be show by the dehydrate %=1/100("maximum weight in 97% humidity"-"miminum weight in 0% humidity"). Dehydrate % of Taxodiaceae and Cupressaceac (exine granular and intine thick) is about 35%, while that of Pinus and Cedrus (exine tegillate and intine thin) is about 9%. The percentage dehydration of common ragweed pollen is about 40% but that of southern ragweed is about 35%. The most remarkable feature on the surface of pollen wall is the presence of electron dense peripheral material which may be also important in connection hay fever. It is necessary to investigate the chemical components of this material. The relationship between ragweed and other plants of pollinosis together their palynological character will be discussed in detail in another paper.