クサアジサイの花粉の変異
スポンサーリンク
概要
- 論文の詳細を見る
The genus Cardiandra is assigned either to the family Saxifragaceae (BENTHAM & HOOKER 1865; ENGLER 1930; H. OHBA 1985a, b) or to the family Hydrangeaceae (HUTCHINSON 1973; AIRY SHAW 1973; CRONQUIST 1981) which is one of families established by subdividing the Saxifragaceae into small families. The genus is a small one which is composed of only two species (H. OHBA 1985a, b). T. OHBA (1986) stated that individual plants of Cardiandra alternifolia grown at Mt. Hakone located in the western part of Kanagawa Profecture have vegetative characters different from individuals grown at different habitats, and furthermore stated that the individuals grown at Mt. Hakone should be treated as a new taxon, that is, C. alternifolia var. hakonensis. But unfortunately this is not effectively published yet. H. OHBA (1985a) stated that the pollen grains of Cardiandra are microreticulate and their tectum seems to be consisting of sparse capitate columellae. Furthermore he stated that the feature is not found in the grains of the species of Hydrangea, which is considered to be closely related to Cardiandra by taxonomists. So we morphologically investigated pollen grains of C. alternifolia from Mt. Hakone and from Mt. Kiyosumi located at the southern part of Chiba Prefecture. The feature of pollen grains of C. alternifolia from both habitats gave nearly entire agreement with H. OHBA'S description (1985a) on the pollen grains of the genus Cardiandra. In our SEM (scanning electron microscope) observation, however, we rarely observed the grains (Fig. 4) with reticulation pattern on their sporoderms in pollen materials collected from individuals from Mt. Kiyosumi. Some species of Hydrangea have reticulate grains (Fig. 6) which are similar to the reticulate grains found first in our SEM observation. This seems to show that Cardiandra is closely related to Hydrangea. The grains collected from individual from Mt. Hakone are larger than those from Mt. Kiyosumi (Tab. 1, Figs. 2C, D). The variation range of the former in pollen size is wider than that of the latter (Figs. 2C, D). The mode value in the histogram (Fig. 2C) presenting the variation range in the size of pollen grains collected from individuals from Mt. Kiyosumi is beyond the range of variation (Fig. 2D) in size of pollen collected from individuals from Mt. Hakone. These facts seem to show that the variation in the size of pollen grains collected from Mt. Kiyosumi and from Mt. Hakone is not placed in the same category. Furthermore, Mt. Hakone is situated at the northernmost part in the distribution region of the genus Cardiandra. Therefore, we have no objection to the treatment of C. alternifolia grown at Mt. Hakone as a new taxon.
- 横浜国立大学の論文
- 1991-03-25
著者
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