花粉膜の表面構造に関する電子顕微鏡的研究 VI : 裸子植物篇 1

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The writers have been engaged in the electronmicroscope investigations on the fine structure of pollen membrane, based on the replica method, and they already published the reports I∿V on their results. The series of this study is, from now on, to be divided into the part of gymnospermae and that of angiospermae. The present report gives the fine structure of the surface of pollen membrane of 5 species, as the 1st report treating the part of gymnospermae. The summary of the results is as follows : 1. Pollen of Cycas revoluta THUNB. : in the dorsal view, the surface of pollen membrane is scattered with many irregularly round-shaped concaves (perhaps small openings), and the protrusions among them show the pattern of fine waves. The longer diameter of the concaves is about 0.2∿0.3μ. In the ventral view, the almost same pattern as in the dorsal view is recognised, but it has the tendency to some decline. On the surface of the germinal furrow are recognised protrusions of irregular meshes. The width of the protrusions is about 0.2∿0.4μ. 2. Pollen of Ginkgo biloba LIN. : on the surface of pollen membrane are arranged irregular protrusions, which are covered all over with linear projections. The tops of these linear projections are pointed, and show spinule-like features. The height of the linear projections in the dorsal view is about 0.1∿0.2μ, and their length is irregularly between 0.2 and 2.0μ. The surface of the membrane of germinal furrow is dotted with spinules or granules, and with faint linear projections at the same time. The length of the linear projections is about 0.2∿1.0μ, the height of the spinules about 0.1∿0.2μ and the diameter of granules about 0.5μ. 3. Pollen of Podocarpus Nagi PILG. : the surface of the body shows the protrusions of the "cauli-flower type", and from their surface are projected fine spinules about 0.1μ long. Besides, the surface of air-filled bladders is comparatively smooth, but we can recognise fine spinules as in the case of the body. The germinal furrow shows an irregularly elliptical form, and on its surface are found the spinules, which are finer than those on the surface of the body. Among the spinules are recognised irregular protrusions. 4. Pollen of Keteleeria Davidiana BEISSN. : the surface of the body is covered with the protrusions of the "cauli-flower type", and some of the protrusions show the similar forms to those of pila. The surface of the protrusions has fine spinules (about 0.1μ) projected from it, and is dotted with small openings (about 0.1μ). Also, we could recognise fine spinules (their height is about 0.1∿0.3μ) and small openings (their diameter about 0.1μ) on the surface of air-filled bladders. 5. Pollen of Pseudolarix Kaempferi GORD. : the surface of the body is covered with the protrusions of the "cauli-flower type", and fine spinules (their height is about 0.1μ) are projected from their surface. Also, the surface of air-filled bladders is irregularly uneven, and is dotted all over with fine spinules (their height is about 0.1∿0.2μ) and small openings (their diameter about 0.1μ).
1959-09-01

花粉膜の表面構造に関する電子顕微鏡的研究 VI : 裸子植物篇 1

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